I recently serviced a LV-103U, somewhat beefier version of this one but same output stage with same transistors. You can use IRFP240 and IRFP9240 to replace the Toshibas but the resistor in bias-curcuit has to be adjusted, from 380R to 150-220R and bias them to around 35-40mV measured over the 2x0.22R (mpc) I had multiple more components blown too, couple of zeners, one sc2240 and 2 resistors plus the MPC then. More power now and better sound overall. Tubes can be replaced with Russian 6n5P for even better sound. I recommend in this series of Luxman amps that all caps to be replaced. This amps is getting hot. I added extra heatsinks to most transistors to avoid further damage to the boards. Btw, my identical switches has be been working ok but tonecontrols and balance, was very noisy. Some WD-40 contact cleaner solved that. Thanks a lot for your videos. Big greeting from Finland!
Good to know subs available as originals are not. My amp has been retired now replaced with a Technics SU-V9. More inputs, more power. I miss the sound of the luxman. It sounded fantastic.
Short comment in favor of long format ...more in depth analysis, consistent train of thought, for those who can focus for more than 12 minutes. Well done as always.
I like your spotlight. Seriously. I work on boards from time to time, and having a small spotlight that doesn't get in the way and keeps your hands free - is a useful tool.
I am surprised all the electrolytics are not replaced.I have r341,r114,and tp114.Man changing all the capacitors really brought the dynamics back.Great video and I for one thank you for taking the time to make these videos.I love my Luxman gear since 1989 .
I changed all the ones in the power supply and audio path except the 4 red ones which I couldn't get. After changing them I checked the old ones and they were all fine. The unit sounds great. Changing caps is overrated. You might think it sounds better it's a psychological thing. I was involved many years ago in a blind test of a restored vs a non restored amp. Same music was played at the same volume over the same speakers. Everyone on the panel, about 40 people were asked to pick the amplifier that had been rebuilt with new audiophile grade capacitors. There was several parts to the test, and nobody knew which amplifier they were listening to. Nobody got it right. Half thought the expensive modded amp sounded better and the other half thought the old stock amp sounded better when they could not see which amp had 1000 in special audiophile caps and really expensive interconnect cables. However 100% picked the rebuilt amp when they could see it. Now when the rebuilt amp was put on test equipment there were measurable differences in distortion and frequency response curves however nobody got it right using their ears when they did not know what they were listening to. Now if someone brings me an amp and says recap it, price is not a concern I will find the most expensive parts and go to town (after getting a sizable deposit) but those customers don't exist. All my customers say fix it as cheap as you can and not a dollar more.
Good sound requires coin, more than most people are willing to spend. But music can still be enjoyed at any price point, it just depends on what provides satisfaction. As for your long detailed videos, just keep them coming. I've learned much from them but I also often play them at 1.25x or even 1.5x. Works for me, thanks!
Love your vids and am a subscriber. I really appreciate all the detail, so the length of the video is no issue. I have always had a soft spot for Luxman audio equipment and in the seventies bought an R1500 receiver/amplifier along with a Linn Sondek turntable and JBL 4311 studio monitors. We STILL have the JBL speakers in our lounge room and still love the sound! This is just a small detail, but I am happy to hear you pronounce the word 'solder' as 'solder' and not 'sodder' as I hear so much on other videos. I guess it's what we grew up hearing, but I thought other presenters had a speech defect saying 'sodder'. Greetings from Australia.
@@12voltvids Here in Australia we say solder also it grates me to hear the Americans say sodder not sure how they get that considering how its spelt.Love the vids from an ex tv , vcr tech from the 80's and 90's also.The long videos are great.
I used to have the 105 and I love the sound this integrand amp has I sold my about 7 years ago I miss it wish I still had it new caps and a good reflow on the connection and it will sound amazing once again thanks for the video
Just wanted to let 12 volt know I bought my first ever digital multi meter (nothing special) today. Next, is the library - to refresh some of the basics I've missed out on since grade 12 electronics class. That's 30 years ago!
Hi my repairman friend dont worry every transistor ever made is a replacement for but most likely these amps are built so that they wil not blow up, if they do please send me its worth fixing them. I had a verry nice sherwood amp with a blown out end stage and after some searching and calculating found a new matching set buildt it in and eeeeh some more failures had to be fixed but after 6 attemps the machine is working nice again with the full sound of real transistors.:)
I for one think these long vids are great, nice one Dave. And thats a lovely old amp that Luxman, ive got a Yamaha ax-550 thats waiting for a switch clean and input selector overhaul, meanwhile the ax-596 is a pretty good back up. Yamahahaha LOL.
I think the red LEDs are used as voltage references. These in turn drive current sources for the input long tailed pairs. It's an interesting idea with a useful side effect (power indication).
The Lv-105 retailed for $700 USD in the late 1980's. I remember lusting after one of these at a local shop called "Sight and Sound" ...when I was a teenager. Though I have to say I found a Technics integrated recently at Goodwill for $8 and recapped it with top dollar caps (Mundorf for power supply filters) and this guy sounds great. Has Sanyo STI chip and transformer is bigger then the Lv103's! (Technics SU-V78 - was sold as part of a modular system and built mostly of plastic el cheapo) But powering my Yamaha NS-1000M's it sounds absolutely amazing, a true sleeper. My main (2) power amplifiers are mosfet based, by LFD (multiple $$$$).
By the late 80s the price probably came down as it had been discontinued however in Canada the 103 sold for 1999.95 and if push came to shove I probably still have the sales receipt because I file all my purchase receipts and have a file cabinet full of them, so i could probably find it. As to recapping an amp that is a total waste of money. Something amateurs do, or crooked audio techs to pad the bill. Take a look at the caps that came out of my luxman. They are all perfect. No capacity lost and better esr than new cap rating. In reality very few caps ever fail on amplifier and when they do you will know it. You will either get severe distortion or ac hum. Modern amplifiers are all direct couples so there are no capacitors in the audio chain to go bad. You have your main filters and that is about it. When a filter fails you hear it right away. If a tech tells you that you need to recap, he is doing it to make more money. Honest techs will never upsell caps. Ever.
Hi Dave, Love your channel for sure, been watching for years. I respectfully disagree with you regarding recapping (given it’s a good unit you like and intend to keep). It’s not about if the 30 year old electrolytic is within spec and working....it’s about replacing Then with superior, better sounding, state of the art capacitors. I am definitely of the camp that can here a huge difference Within about 1 week after a full recap. Common knowledge electrolytic’s have a life range unlike say film caps. Have done all my vintage equipment with amazing results. It does cost a lot of $$$ And time but worth the investment. Just finished my BGW 203 preamplifier ($600 in caps and resistors) Sounds incredible. Kevin
Hi A few months ago I bought a 105u in Massachusetts for 300 it has been working fine i did a visual inspection of the circuit boards and caps i didn't see any thing wrong so far the phono stage is awesome with my AR Turntable 80s version
Dave, sounds like you are in my general area in North America... I’m in The Fraser Valley, God’s Country! You have a very interesting, entertaining channel, thanks for all the information. Like your “patter” about the various things you do. Any suggestion as to whom I should get in the area to repair my Luxman R1050 Receiver? I also have a Luxman R800 I might get repaired as well. Love Luxman stuff, but haven’t had good luck with their reliability... 😢. Parts hard to find when they break down.
I have one of these that my dad bought in the mid 80’s. I’d like to get some speakers that pair well. What size speakers would complement them the best? Thanks.
I have this LV103 and the balance is not working sometimes, the left speaker is not working even though the balance position is in the center. I hope i can find solution in your video.
There was actually no need to drill holes in those switches to get cleaner in. The plastic where you drilled the holes is only fixed to the body of the switch towards the front, so you can use a fine scapel to lever up this pastic tongue just enough to get your straw in. It will then click back into place when you are done.
I have an LV 103 as well from 1985 or 6. Would love to have it serviced as I am getting left channel dropout on the Av/Aux and CD settings. How did you create the holes for the Deoxit?
Hi Mr. Thank you for using your time to share this video. In my early teens, I borrowed this LV 103, but as a youngsters, I did not have the financial to buy this kind of equipment. Lately, I bought one used for around $100. The owner told me about some problems, but I didn't mind. When finding time, I have to service it for sure. I have a question for you. When cleaning the switches or pot meters in general, what products do you prefer? What is the best solvent according to your experiences? Thanks in advance. Best regards, Roy from Viking land
The suspense at the end it is a thriller. My bet would be the Gardener was the murderer. Jokes aside, I think this Luxman has a high emotional value for you since you treat it with so much love. Maybe it is kind of a timetunnel that might bring back some nice memories from the 80ties for you?
I Paid $400 for a Dual Direct-Drive turntable once. We were in a band, and when learning cover songs, it came in handy! We could speed up or slow down the record, so the guitar players didn't have to re-tune after each song!
So nice that you can take the bottom plate off to inspect the amplifier trace components. I had to tin snip and cut out the bottom so i could check and replace components on my onkyo 4k receiver. Every certified repair man/woman has to take everything apart to fix a componant. That's Obsolecence for ya.
@@12voltvids You should have seen my face when I read that. I have a Yammy at the moment with the short little connectors from the power tranny and the whole damn thing has to come out of the case to replace one pot and a high resistor. Grrrrr. I can't stand amps with no bottom panel!!
Hi, I'd like to say that your videos are really helpful and informative. I also have a question. I have a Yamaha P2150 power amp with a problem. When powering up, one channel would fry the output transistors and their caps.I was able to borrow a vari-ac and tried powering up at 60VAC.Nothing fried and audio was present. So I increased the power by 5VAC each time I powered up and all was good up to 115VAC. Audio was crisp and clean. At this point I set the vari-ac to 116VAC and it started to get warm so I shut it down. However if I were to fire it up at 120VAC it would fry the Transistors. Could you just tell me where I should look to find the problem. Thanks for your time.
The model number doesnt mean anything as I don't remember model numbers however if it is a direct coupled amp look for an open resistor in the circuit.
They certainly are the original. I bought this unit new and the only work that has ever been done was cleaning the input selector switches. The tubes are still fine. They are just preamp buffer tubes. Voltage amplifier. No overdriving and no high demands. They last pretty much forever.
Who cares what people want? If they don't like it, they have a thumb & they can skip ahead! That's what I do on videos sometimes.👍 You will never be able to satisfy 100% of the people 100% of the time!
I saw a lot of oxidation on those tube socket solder joints....... Me personally , I would have taken that tooth brush and that acetone or alcohol and cleaned that PCB , then taken the old solder off , and then re solder the joints...... That old crud on there hindered your re flow Mon Ami .....
Those Elna Cerafine caps were very high quality in their day, but are probably past their prime now. Good replacements would be Elna Silmic II or Nichicon Fine Gold.
I really love watching your videos, I love your intuitions, your skills, following your reasoning, watching your manual work but damn you should take care better of the cosmetic of your gears :D what did you do to this poor amp to have it so spoiled?
The input switches is the biggest problem with these and the overly sensitive protection circuit. Crank it too high and it will trip the protection and up u lose your sound until you turn it down. So for driving the speakers to their extreme, no this is not the amp for you. For normal listening levels the sound is fantastic. Sounds just like a tube amp with more kick at the low end.
Well I did this much eralier, and started the video rendering. The file was over 22 gigs in size and I have only a 20 meg internet connection so it takes a long time to upload. Sure I could have fiber, but I am still on copper service here, so my upload speed is a little slower than my download. I just set it and forget it. The upload actually finished at 9 here, but it took YT awhile to process it.
@@peterc2373 This amp was from 1982 and the solder used is 60/40 leaded solder, the exact same stuff I was using. I do use leaded solder on lead free as well and it flows fine. The other way is problematic.
Sorry, I meant is this just a hobby or do you charge money to do mods and repairs? Do you sell this vintage gear? And I dont mean to pry into where you live precisely, I just was genuinely delighted to find someone who was into hifi gear nearby!
I like the good quality old amplifiers, there isn't much you can't repair. (No crappy stk junk). Why would anyone not want the full diagnostic?, i like to see the process and the typical problems. And when you put your deer stalker hat on to track down the pesky faults, it's always interesting :-D. The valve pre amp is very unusual.
The tubes are there to add even order harmonics to warm up the sound. Pretty much all the really high end brands still do this, but this was the first one to do it.
Nice ! I have restored an LV-105u. The main board was broken in pieces probably after the unit being dropped. It had huge soldering and corrosive glue issues. When solder was not sticking, I vacuumed the old one and used flux and fresh solder. The only remaining problem I still have is a worn out volume pot I cannot find anywhere (150kB stereo with loudness tap) .
new equivalent to the mos fets of this luxman lv 103??? plzz if you know write me reply... one guy cut mines off and changed them with something that makes the amp not working .. sorry for my english
HELP plzzzzzz you said that this amp is mosfet ??? And there is no way I can fix mine now ??? i gave it to local Macedonian engineer and he said he fixed it and gave me back the mos fets and couple of other parts... I opened it and he changed them with i guess transistors , BUT ITS NOT WORKING ... PLZZ if you can reply to me what can i do to get the right mos fets or transistors that will work. i tried to play it 1 time and it blow up 3 out of 4 fuses HELPPPPPP
@@12voltvids ohh thank you sir thank you for the quick reply so i can use transistors now on this amp or there is no hope ??? if you know what i can replace them with can you write me once more ?? he did the same mod for A B speakers lol im thinking he watched your video 😁
@@ChudGippity I don't know if there is a suitable replacement for the originals. I have never tried to sub those ones. There may be a way to do it, but I have not attempted.
@@12voltvids wow i have a paper weight .... I loved the soun out of that amp i may hurt that engineer now , but ill use my yamahaha rx v3000rds and cry for the luxman because I know that no one will accept to try to fix it now all they do to me is taking my money for"diagnosis" and send me home with less spine every time cuz it is heavy thank you and yea i subbed on your chan it is at least i can do Thank you and respect from MACEDONIA
Have you ever tried that tip cleaner/tinner it comes in a little tin make tip last long time , but I dont do anywhere , near the amount of soldering you do , now that I have bought a Hakko tips are much more expensive. My 898D tips were only about a dollar a piece .are hybrid amps. More expensive.
Personally i'd have the Technics SU series amp you recently repaired over this Luxman, as you probably are aware being in the industry this was designed/built by Alpine just the build quality alone from your overview camera shot makes it look cheaply made not up to the former quality of previous designed/built by Luxman Corporation products. But if you enjoy it that's all that matters and how it sounds, not my opinion.
This was from the alpine/luxman era for sure. This was one of the first ones they released and even though it might not be to the same standards that their legacy components were, it has lasted 35 years with little trouble other than the input switches and a couple of leaky Elna caps. It has been abused for many years driving altec lansing 6 ohm speakers and never once complained. Now I have the suv9 in its place and I am quite happy with its performance. The suv9 has more than twice the power. This one however has that warm tube sound. I'll put a tube buffer on the technics and see how it sounds.
I have a Luxman amplifier lv105u Power transistors ( 2sk405 _ 2sj115 ) are not available in the market There is available equivalent For installation , thanks
Not that i am aware of. That's the problem with old electronics. Old parts made of the mineral ubobtanium. Similar to germanium with with characteristics closer to silicon. Unfortunately the earth has run out of ubobtanium these days. Helium is next.
know what kills me is when you can see inside the unit and its so dusty. could that be some of the problem?...every channel that i watch they ll have a dusty piece of equipment. its like oh its just dust doesnt affect anything. that not true dusty becomes conductive over time.
Looks like a good amp but i dont think it is 2000$ worth just cause it has a tube pre amp dose not mean it shuld be super expinseve. The construction of this amp is not worth 2000$. Now it is a nice amp with desint sound quality and serviceability is a solid b+ but the over all construction is about tipical of equipment from the late 70s-mid 80s. Same quality as my jvc amp. So i would Price it 1200$usd to 1400$usd.
That is YOUR opinion. These sold in Canada for over 2000.00 for this model, and the LV105 was 2400.00. Since they were sold at the specialty dealers, the same ones that sold Quad, Wharfdale, Linn, Keff, Nakamichi ect. There were no discounters selling these pieces. If you wanted one you bought it from the dealer and paid the price they were sell for of you didn't buy it simple as that. I have no idea what they went for in the US, but I would imagine if currency exchange was accounted for, it was probably similar. Back when this was new a 20" Sony trinitron TV with stereo sound sold for over 1000, and a VHS Hifi VCR was also well north of 1000.00. I could have bought a Sony TAN77ES for less, and should have. The guy I worked with bought a few of them, and is laughing now because he recently sold one for 3000.00 It probably was around 1400 US at the time as that would have converted to around 2000 Canadian. I remember how much I paid, and was given a bad time by the guys I worked with because we were big Sony dealers, and had just been rewarded the ES franchise. I did buy some Sony gear. I have a TC75ES and CDPX555ES cd player. The only reason I bought this was because of the hybrid design. I heard the sound once and had to have it. Once you hear a good hybrid or full tube amp you will understand. If you haven't experienced the sound quality of a MOSFET output hybrid or a full on tube amp, there is no reason to explain, because it is falling on deaf ears, so to speak. The tube amp people out there are all nodding their heads now in agreement.
I recently serviced a LV-103U, somewhat beefier version of this one but same output stage with same transistors.
You can use IRFP240 and IRFP9240 to replace the Toshibas but the resistor in bias-curcuit has to be adjusted, from 380R to 150-220R and bias them to around 35-40mV measured over the 2x0.22R (mpc)
I had multiple more components blown too, couple of zeners, one sc2240 and 2 resistors plus the MPC then.
More power now and better sound overall.
Tubes can be replaced with Russian 6n5P for even better sound.
I recommend in this series of Luxman amps that all caps to be replaced.
This amps is getting hot. I added extra heatsinks to most transistors to avoid further damage to the boards.
Btw, my identical switches has be been working ok but tonecontrols and balance, was very noisy. Some WD-40 contact cleaner solved that.
Thanks a lot for your videos. Big greeting from Finland!
Good to know subs available as originals are not. My amp has been retired now replaced with a Technics SU-V9. More inputs, more power. I miss the sound of the luxman. It sounded fantastic.
The diagnostics are 80% of the reason I watch these videos. Your stories are the other 20%.
Diagnostics are 99% of the reason for me. Cats are the remaining 1 percent. 😋
I love watching the diagnostic process too. A five minute video would not do justice to the effort that went into the repair.
Short comment in favor of long format ...more in depth analysis, consistent train of thought, for those who can focus for more than 12 minutes.
Well done as always.
I appreciate the long format.
There is another 30 minutes coming.
I also prefer long ones, there is always something that i can learn from them despite my many years of experience ;)
Same here very informative.
I like your spotlight.
Seriously.
I work on boards from time to time, and having a small spotlight that doesn't get in the way and keeps your hands free - is a useful tool.
It's just a cheap led with the diffuser removed.
I am surprised all the electrolytics are not replaced.I have r341,r114,and tp114.Man changing all the capacitors really brought the dynamics back.Great video and I for one thank you for taking the time to make these videos.I love my Luxman gear since 1989 .
I changed all the ones in the power supply and audio path except the 4 red ones which I couldn't get. After changing them I checked the old ones and they were all fine.
The unit sounds great. Changing caps is overrated. You might think it sounds better it's a psychological thing. I was involved many years ago in a blind test of a restored vs a non restored amp.
Same music was played at the same volume over the same speakers. Everyone on the panel, about 40 people were asked to pick the amplifier that had been rebuilt with new audiophile grade capacitors. There was several parts to the test, and nobody knew which amplifier they were listening to. Nobody got it right. Half thought the expensive modded amp sounded better and the other half thought the old stock amp sounded better when they could not see which amp had 1000 in special audiophile caps and really expensive interconnect cables. However 100% picked the rebuilt amp when they could see it.
Now when the rebuilt amp was put on test equipment there were measurable differences in distortion and frequency response curves however nobody got it right using their ears when they did not know what they were listening to.
Now if someone brings me an amp and says recap it, price is not a concern I will find the most expensive parts and go to town (after getting a sizable deposit) but those customers don't exist. All my customers say fix it as cheap as you can and not a dollar more.
Thanks for sharing this. Gave me the confidence to take apart my almost 40yr old LV-105 and clean up some of the pots to make it usable again.
Good sound requires coin, more than most people are willing to spend. But music can still be enjoyed at any price point, it just depends on what provides satisfaction. As for your long detailed videos, just keep them coming. I've learned much from them but I also often play them at 1.25x or even 1.5x. Works for me, thanks!
Love how many times you say the word "service"
Love your vids and am a subscriber. I really appreciate all the detail, so the length of the video is no issue. I have always had a soft spot for Luxman audio equipment and in the seventies bought an R1500 receiver/amplifier along with a Linn Sondek turntable and JBL 4311 studio monitors. We STILL have the JBL speakers in our lounge room and still love the sound! This is just a small detail, but I am happy to hear you pronounce the word 'solder' as 'solder' and not 'sodder' as I hear so much on other videos. I guess it's what we grew up hearing, but I thought other presenters had a speech defect saying 'sodder'. Greetings from Australia.
It's an american thing. That's how they say it, and I ain't an american. I am Scottish and we say it like the Brits with the "L"
@@12voltvids Here in Australia we say solder also it grates me to hear the Americans say sodder not sure how they get that considering how its spelt.Love the vids from an ex tv , vcr tech from the 80's and 90's also.The long videos are great.
I used to have the 105 and I love the sound this integrand amp has I sold my about 7 years ago I miss it wish I still had it new caps and a good reflow on the connection and it will sound amazing once again thanks for the video
I wish I had a 105!
Long format appreciated! Nice unit!
Just wanted to let 12 volt know I bought my first ever digital multi meter (nothing special) today. Next, is the library - to refresh some of the basics I've missed out on since grade 12 electronics class. That's 30 years ago!
Hi my repairman friend dont worry every transistor ever made is a replacement for but most likely these amps are built so that they wil not blow up, if they do please send me its worth fixing them. I had a verry nice sherwood amp with a blown out end stage and after some searching and calculating found a new matching set buildt it in and eeeeh some more failures had to be fixed but after 6 attemps the machine is working nice again with the full sound of real transistors.:)
I for one think these long vids are great, nice one Dave.
And thats a lovely old amp that Luxman, ive got a Yamaha ax-550 thats waiting for a switch clean
and input selector overhaul, meanwhile the ax-596 is a pretty good back up. Yamahahaha LOL.
I still have my Technics amp from this era hooked up to my computer speakers. The only service I have done to it is to clean the switches.
I think the red LEDs are used as voltage references. These in turn drive current sources for the input long tailed pairs. It's an interesting idea with a useful side effect (power indication).
The Lv-105 retailed for $700 USD in the late 1980's. I remember lusting after one of these at a local shop called "Sight and Sound" ...when I was a teenager. Though I have to say
I found a Technics integrated recently at Goodwill for $8 and recapped it with top dollar caps (Mundorf for power supply filters) and this guy sounds great. Has Sanyo STI chip and
transformer is bigger then the Lv103's! (Technics SU-V78 - was sold as part of a modular system and built mostly of plastic el cheapo) But powering my Yamaha NS-1000M's it sounds absolutely amazing, a true sleeper. My main (2) power amplifiers are mosfet based, by LFD (multiple $$$$).
By the late 80s the price probably came down as it had been discontinued however in Canada the 103 sold for 1999.95 and if push came to shove I probably still have the sales receipt because I file all my purchase receipts and have a file cabinet full of them, so i could probably find it. As to recapping an amp that is a total waste of money. Something amateurs do, or crooked audio techs to pad the bill. Take a look at the caps that came out of my luxman. They are all perfect. No capacity lost and better esr than new cap rating. In reality very few caps ever fail on amplifier and when they do you will know it. You will either get severe distortion or ac hum.
Modern amplifiers are all direct couples so there are no capacitors in the audio chain to go bad. You have your main filters and that is about it. When a filter fails you hear it right away.
If a tech tells you that you need to recap, he is doing it to make more money. Honest techs will never upsell caps. Ever.
Hi Dave, Love your channel for sure, been watching for years. I respectfully disagree with you regarding recapping (given it’s a good unit you like and intend to keep). It’s not about if the 30 year old electrolytic is within spec and working....it’s about replacing Then with superior, better sounding, state of the art capacitors. I am definitely of the camp that can here a huge difference Within about 1 week after a full recap. Common knowledge electrolytic’s have a life range unlike say film caps. Have done all my vintage equipment with amazing results. It does cost a lot of $$$ And time but worth the investment. Just finished my BGW 203 preamplifier ($600 in caps and resistors) Sounds incredible. Kevin
Hi A few months ago I bought a 105u in Massachusetts for 300 it has been working fine i did a visual inspection of the circuit boards and caps i didn't see any thing wrong so far the phono stage is awesome with my AR Turntable 80s version
This is one of the nicest sounding amplifiers I own.
Dave, sounds like you are in my general area in North America... I’m in The Fraser Valley, God’s Country! You have a very interesting, entertaining channel, thanks for all the information. Like your “patter” about the various things you do. Any suggestion as to whom I should get in the area to repair my Luxman R1050 Receiver? I also have a Luxman R800 I might get repaired as well. Love Luxman stuff, but haven’t had good luck with their reliability... 😢. Parts hard to find when they break down.
That lovely amp would be a piece of art in brushed aluminum silver face
I have one of these that my dad bought in the mid 80’s. I’d like to get some speakers that pair well. What size speakers would complement them the best? Thanks.
I have this LV103 and the balance is not working sometimes, the left speaker is not working even though the balance position is in the center. I hope i can find solution in your video.
I love the long video's
There was actually no need to drill holes in those switches to get cleaner in. The plastic where you drilled the holes is only fixed to the body of the switch towards the front, so you can use a fine scapel to lever up this pastic tongue just enough to get your straw in. It will then click back into place when you are done.
I like your work Lamp ... Seems like you attached a smaller flood lamp so that it does interfere during debug.
Is just me, or is that vertical board (~44:25) bowed in towards the heatsink?
I have an LV 103 as well from 1985 or 6. Would love to have it serviced as I am getting left channel dropout on the Av/Aux and CD settings. How did you create the holes for the Deoxit?
Small drill
Hi Mr. Thank you for using your time to share this video. In my early teens, I borrowed this LV 103, but as a youngsters, I did not have the financial to buy this kind of equipment. Lately, I bought one used for around $100. The owner told me about some problems, but I didn't mind. When finding time, I have to service it for sure. I have a question for you. When cleaning the switches or pot meters in general, what products do you prefer? What is the best solvent according to your experiences? Thanks in advance. Best regards, Roy from Viking land
Deoxit d5 is the best.
The suspense at the end it is a thriller. My bet would be the Gardener was the murderer. Jokes aside, I think this Luxman has a high emotional value for you since you treat it with so much love. Maybe it is kind of a timetunnel that might bring back some nice memories from the 80ties for you?
Memories from the 80s.... I'm still looking at her. Certainly was a simpler time compared to today.
I Paid $400 for a Dual Direct-Drive turntable once. We were in a band, and when learning cover songs, it came in handy! We could speed up or slow down the record, so the guitar players didn't have to re-tune after each song!
Luv all the videos, haters only jealous. Carry on 👍
So nice that you can take the bottom plate off to inspect the amplifier trace components. I had to tin snip and cut out the bottom so i could check and replace components on my onkyo 4k receiver. Every certified repair man/woman has to take everything apart to fix a componant. That's Obsolecence for ya.
Thank you dave for the diagnosis.
Yamahahaha started the no removable panel crap and everyone jumped on the cheap bandwagon.
@@12voltvids You should have seen my face when I read that. I have a Yammy at the moment with the short little connectors from the power tranny and the whole damn thing has to come out of the case to replace one pot and a high resistor. Grrrrr. I can't stand amps with no bottom panel!!
Hi, I'd like to say that your videos are really helpful and informative. I also have a question. I have a Yamaha P2150 power amp with a problem. When powering up, one channel would fry the output transistors and their caps.I was able to borrow a vari-ac and tried powering up at 60VAC.Nothing fried and audio was present. So I increased the power by 5VAC each time I powered up and all was good up to 115VAC. Audio was crisp and clean. At this point I set the vari-ac to 116VAC and it started to get warm so I shut it down. However if I were to fire it up at 120VAC it would fry the Transistors. Could you just tell me where I should look to find the problem. Thanks for your time.
The model number doesnt mean anything as I don't remember model numbers however if it is a direct coupled amp look for an open resistor in the circuit.
@@12voltvids Thanks for the info. I appreciate it.
I would have thought a tube change since you were in there? All those hours and years on those tubes. They can't be the original?
They certainly are the original. I bought this unit new and the only work that has ever been done was cleaning the input selector switches. The tubes are still fine. They are just preamp buffer tubes. Voltage amplifier. No overdriving and no high demands. They last pretty much forever.
18:27 what are those 6cg76fq7s or 12bh7s?
Someone wasn't paying attention because I showed it. I suggest you go back and watch again.
Any experience with Luxman A-377?
Who cares what people want?
If they don't like it, they have a thumb & they can skip ahead!
That's what I do on videos sometimes.👍
You will never be able to satisfy 100% of the people 100% of the time!
I made that comment due to a response from someone that said that long videos are unnecessary.
I like the long videos. Very informative and much appreciated.
@Orange OwL I am in Herrin, IL.. U.S.
@@12voltvids long videos are better it help to understand more about what your fixing
I saw a lot of oxidation on those tube socket solder joints....... Me personally , I would have taken that tooth brush and that acetone or alcohol and cleaned that PCB , then taken the old solder off , and then re solder the joints...... That old crud on there hindered your re flow Mon Ami .....
Those Elna Cerafine caps were very high quality in their day, but are probably past their prime now. Good replacements would be Elna Silmic II or Nichicon Fine Gold.
They were good. Unfortunately they are not available locally and I doubt I will hear the difference anyway.
@@12voltvids That's why you paid a lot of money for that amp back in the day. Very high quality audio-grade components.
quick search i found both fets on aliexpress they sell them in pairs can get 5 for around 22 bucks in case you ever need some
I really love watching your videos, I love your intuitions, your skills, following your reasoning, watching your manual work but damn you should take care better of the cosmetic of your gears :D what did you do to this poor amp to have it so spoiled?
This one has thousands of hours of use on it. That's how they go after years of use.
I remember we sold these things in my dad's shop. A lot of returns...
The input switches is the biggest problem with these and the overly sensitive protection circuit. Crank it too high and it will trip the protection and up u lose your sound until you turn it down. So for driving the speakers to their extreme, no this is not the amp for you. For normal listening levels the sound is fantastic. Sounds just like a tube amp with more kick at the low end.
me: who uploads RUclips videos at 1 in the morning?
12voltvids: Oh boy 1am
Lol jk
Well I did this much eralier, and started the video rendering. The file was over 22 gigs in size and I have only a 20 meg internet connection so it takes a long time to upload. Sure I could have fiber, but I am still on copper service here, so my upload speed is a little slower than my download. I just set it and forget it.
The upload actually finished at 9 here, but it took YT awhile to process it.
@@hpmmqh4477 Ever heard of time zones? []:
Nice warm sound.
arent you mixing leadfree solder with solder with lead ?
So, you got a problem with that ?
@@12voltvids i do not ... but those 2 doesnt like to mix , thats why the soldering is hard to do...
@@peterc2373 This amp was from 1982 and the solder used is 60/40 leaded solder, the exact same stuff I was using.
I do use leaded solder on lead free as well and it flows fine. The other way is problematic.
Did you use that amp as a hockey puck at some point?
????
@51:00 my guess is the op amp...
Stay tuned.
troubleshooting is the bit i love
Hey you live in Burnaby?! Im in Vancouver, do you do mods and repairs?
I'm south of the river
Sorry, I meant is this just a hobby or do you charge money to do mods and repairs? Do you sell this vintage gear? And I dont mean to pry into where you live precisely, I just was genuinely delighted to find someone who was into hifi gear nearby!
I like the good quality old amplifiers, there isn't much you can't repair. (No crappy stk junk).
Why would anyone not want the full diagnostic?, i like to see the process and the typical problems.
And when you put your deer stalker hat on to track down the pesky faults, it's always interesting :-D.
The valve pre amp is very unusual.
The tubes are there to add even order harmonics to warm up the sound. Pretty much all the really high end brands still do this, but this was the first one to do it.
That’s why ebay is called the electronic wrecking yard😆
Is it possible to modify LV 103 as pre amp?
I would say no, not easily. The question is why? Just go get a tube buffer. They are cheap.
Nice ! I have restored an LV-105u. The main board was broken in pieces probably after the unit being dropped. It had huge soldering and corrosive glue issues. When solder was not sticking, I vacuumed the old one and used flux and fresh solder. The only remaining problem I still have is a worn out volume pot I cannot find anywhere (150kB stereo with loudness tap) .
new equivalent to the mos fets of this luxman lv 103???
plzz if you know write me reply... one guy cut mines off and changed them with something that makes the amp not working .. sorry for my english
HELP plzzzzzz
you said that this amp is mosfet ??? And there is no way I can fix mine now ???
i gave it to local Macedonian engineer and he said he fixed it and gave me back the mos fets and couple of other parts...
I opened it and he changed them with i guess transistors , BUT ITS NOT WORKING ...
PLZZ if you can reply to me what can i do to get the right mos fets or transistors that will work.
i tried to play it 1 time and it blow up 3 out of 4 fuses
HELPPPPPP
Yes they are and the mosfets are obsolete now.
@@12voltvids ohh thank you sir thank you for the quick reply
so i can use transistors now on this amp or there is no hope ???
if you know what i can replace them with can you write me once more ??
he did the same mod for A B speakers lol im thinking he watched your video 😁
@@ChudGippity I don't know if there is a suitable replacement for the originals. I have never tried to sub those ones. There may be a way to do it, but I have not attempted.
@@12voltvids wow i have a paper weight .... I loved the soun out of that amp i may hurt that engineer now , but ill use my yamahaha rx v3000rds and cry for the luxman
because I know that no one will accept to try to fix it now all they do to me is taking my money for"diagnosis" and send me home with less spine every time cuz it is heavy
thank you and yea i subbed on your chan
it is at least i can do
Thank you and respect from MACEDONIA
Have you ever tried that tip cleaner/tinner it comes in a little tin make tip last long time , but I dont do anywhere , near the amount of soldering you do , now that I have bought a Hakko tips are much more expensive. My 898D tips were only about a dollar a piece .are hybrid amps. More expensive.
I have a tip cleaner. Use it all the time. That tip is over a year old.
Personally i'd have the Technics SU series amp you recently repaired over this Luxman, as you probably are aware being in the industry this was designed/built by Alpine just the build quality alone from your overview camera shot makes it look cheaply made not up to the former quality of previous designed/built by Luxman Corporation products. But if you enjoy it that's all that matters and how it sounds, not my opinion.
This was from the alpine/luxman era for sure. This was one of the first ones they released and even though it might not be to the same standards that their legacy components were, it has lasted 35 years with little trouble other than the input switches and a couple of leaky Elna caps. It has been abused for many years driving altec lansing 6 ohm speakers and never once complained. Now I have the suv9 in its place and I am quite happy with its performance. The suv9 has more than twice the power. This one however has that warm tube sound. I'll put a tube buffer on the technics and see how it sounds.
I have a Luxman amplifier lv105u
Power transistors ( 2sk405 _ 2sj115 ) are not available in the market
There is available equivalent For installation , thanks
Not that i am aware of. That's the problem with old electronics. Old parts made of the mineral ubobtanium. Similar to germanium with with characteristics closer to silicon. Unfortunately the earth has run out of ubobtanium these days. Helium is next.
i love the way you test just use my finger :)
know what kills me is when you can see inside the unit and its so dusty. could that be some of the problem?...every channel that i watch they ll have a dusty piece of equipment. its like oh its just dust doesnt affect anything. that not true dusty becomes conductive over time.
In high humidity it can but humidity here not that high.
Sherlock Holmes and electronics!
Looks like a good amp but i dont think it is 2000$ worth just cause it has a tube pre amp dose not mean it shuld be super expinseve. The construction of this amp is not worth 2000$. Now it is a nice amp with desint sound quality and serviceability is a solid b+ but the over all construction is about tipical of equipment from the late 70s-mid 80s. Same quality as my jvc amp. So i would Price it 1200$usd to 1400$usd.
That is YOUR opinion. These sold in Canada for over 2000.00 for this model, and the LV105 was 2400.00. Since they were sold at the specialty dealers, the same ones that sold Quad, Wharfdale, Linn, Keff, Nakamichi ect. There were no discounters selling these pieces. If you wanted one you bought it from the dealer and paid the price they were sell for of you didn't buy it simple as that.
I have no idea what they went for in the US, but I would imagine if currency exchange was accounted for, it was probably similar. Back when this was new a 20" Sony trinitron TV with stereo sound sold for over 1000, and a VHS Hifi VCR was also well north of 1000.00.
I could have bought a Sony TAN77ES for less, and should have. The guy I worked with bought a few of them, and is laughing now because he recently sold one for 3000.00
It probably was around 1400 US at the time as that would have converted to around 2000 Canadian.
I remember how much I paid, and was given a bad time by the guys I worked with because we were big Sony dealers, and had just been rewarded the ES franchise. I did buy some Sony gear. I have a TC75ES and CDPX555ES cd player. The only reason I bought this was because of the hybrid design. I heard the sound once and had to have it. Once you hear a good hybrid or full tube amp you will understand.
If you haven't experienced the sound quality of a MOSFET output hybrid or a full on tube amp, there is no reason to explain, because it is falling on deaf ears, so to speak. The tube amp people out there are all nodding their heads now in agreement.
I prefer 4 tubes/valves/ ECC83 x2/EL84 x2
I have a single ended tube. Sounds nice but only 9 watts / channel.
Looks like you know what you're doing but please buy some better tools, a good set of screwdrivers for a start maybe? :)
How about you send me a set. You seem to be an expert on screw drivers.
dobro 😂
I like long videos learn more thanks
there's troubleshooting and then there's spending 10 minutes removing screws.
I have never spent 10 minutes removing screws. Perhaps 2 and that was to show which screws to remove
Fix the problem then find what caused the problem and fix that problem that is what i do