Damn that old school stuff. The old school stuff can last forever, if taken care of, and that is terrible. I mean it's surely not going to help make rich people richer if you don't have to keep buying new replacements to replace the new school stuff that last only a few years. Damn it, my 1976 Heathkit AA-1506 Audio Amplifier is working perfectly and still almost looks as good as brand new. This is terrible. And that's not all. My 1976 home made speakers, that each contain one 15" woofer, 2 mid-range drivers, and 4 tweeters, are still working and sounding as good as the day I built them. But it gets even worse. My 1978 Soundcraftsmen PE2217 Equalizer with Preamp, looks and works as good as the day I purchased it. Then comes my 1987 DENON DCD-900 CD player. It too looks and works as good as the day i bought it. And then there is my 1978 AKAI 630D reel-to-reel tape recorder, another damn thing that looks and works as good as new. And the other pain inflicting item, is my 1976 Yamaha CT-800 FM/AM Stereo Tuner with Exclusive NF Switching MPX Demodulator. Yep, it's tough, not handing money to the rich.
Yaaaay another video!!! I was going to buy one of these blown off of ebay to repair about 8 months ago, but decided agaisnt doing so. Kinda glad i didjmnt due to the availability problems with the P channel fets. Love the vids!! Keep em coming!!
My dad's mate used to have load of these absolute beasts! I remember how clean but powerful they were and always used to get a kick when we used to push them hard.
I often wonder while watching your videos, what you charge on average for these repairs, especially a repair such as this one with those tiny resistors and the time it takes to find all the faulty parts....
important to mention, that you will find any transistors in china but they won`t work or do even more damage as those bastards remarking transistors (and other parts)
I have a 800 x4 sound digital amplifier that I need repaired it is the older model and I really would love to get it fixed if you or know someone who can repair it for me please let me know.
Perhaps as an old school guy @ 62 years but I've seen these teeny teeny little parts once before and I said "Ok I'm all for high tech stuff being made smaller and more compact but this is ridiculous". These parts are just too small. I mean put a standard resistor next to one of these and it is inevitable that they'll fail. I love my new tube amps and solid state stuff but these parts are a joke. PCBs are no ones friend. They flex and crack and a trace thats open is very hard to spot. These parts are a joke. Sorry...just saying.
My good friend, these parts you mention are massive. The resistors, capacitors and diodes in your mobile phone are only visible and serviceable with a microscope 😁 I don't mind it as long as the assembly quality and application are correct. Smaller parts are typically more efficient and suffer less from vibration damages since their resonance is way outside of that it would be subjected to in normal use. It also allows devices to be much smaller. If your phone or laptop was made with through-holes you wouldn't be able to carry it around haha.
I forgot to add something. Printed Circuit Boards have their limitions. Mobile phones today use these parts and I was well aware of that. Vacuum tubes or Valves as we call them here in Australia generate a lot of heat. If you mount a tube socket to a PCB, over time with cycled use, there is a high probability of a trace going faulty. I own a PrimaLuna High Power integrated amp. All of the components are wired point to point except for a few PCBs in very low voltage and heat areas. All the valve sockets are mounted to the chassis and they are surrounded by pencil sized holes to let as much heat out as possible. The 8 EL34s give me a linear and clean valve sound using the 4 ohm tap. I've been using this amp since I bought it 7 years ago and it has never missed a beat. The adaptive auto bias in this amp runs the tubes and analyses them 10 times per second....kinda like your EFI in your car. If a valve fails, the amp goes into protect mode and a red LED lights up next to the faulty valve. You replace it, shut the amp off which resets it. You turn it back on and no more multi-meters to bias the new tube. A guy in America left his New PrimaLuna amp on before going on a 6 month work/holiday and he nearly keeled over when he saw that the amp was on when he got back home. He got a tech friend to analyse them and because the plates were biased off, Everything was fine. He lost about 2% usage from the EL34s and the 6 12AU7s last forever. I hope that clears up my mistake. Andrew from OZ.
Always loved old school Rockford. My all-time favorites, though, are the 2nd gen Punch amps (non-HD). I had a 2nd gen Punch 150 way back in the day, and that thing was bulletproof. Sounded awesome too. Nice work my friend. 🏆🥇🥇🎖
Thanks for showing how to set the bias pots. I have a pair of Rockford PR-2100 TYPE II that I bought back in the 80's, one worked and one was sold to me for parts. The only part that was missing was the turn-on transistor! So I had a collection of transistors and found one that made it work. I messed around with this amp and in doing so I "adjusted" one of the bias pots and not noticing any audible difference I turned it back to it's original position. After seen how critical this adjustment is I'm going to dig this amp out of my closet and put it on my scope (one identical to yours) and see just how far out of whack it is.. Thanks for the tip mate!
Just got rid of one. Had to send it to Canada from Wash DC, bout 120.00 and a pain in the ass! Ive got a pdf of the full schematic and owners manual if ya need it.
I have 3 fosgate amplifiers on my shelf waiting to be fixed im having a hard time finding mosfets like those i dont want to pull them from working amplifiers
What state are in the silvery-color capacitors? They look like ones I've seen before as troublesome, tendency for all of them to go open-circuit. Maybe they ARE all open circuit and doesn't noticeably affect the perfoermance, being as it's a DC-coupled amplifer. I don't know this brand of amp, but some DC-coupled amps have an extra bootstrap bias thing going, on to acheive more gate-drive swing.
Could you take an amplifier and inspect it to see if you can do some internal component upgrades. I have a Slapz Audio Shock 3k and it's the exact same amplifier as the Black Brick 3k as well as the Sundown SFB 3k. I would expect Sundowns 3k has upgraded components. Could you upgrade the components on the Shock 3k?
aye the classic name for those resistors is emitter resistors as theyre on the emitter of a BJT class AB but with mofset final yes you are right there is no emitter but the reference name for those resistors has stuck, at least with me, lol.
Crazy thing. I have a 3k that's the same size. It needs to be fixed also. But i have not opened it up yet. To see if it resembles this Surfboard on your bench. Lol.
barevids i have an issue with a old crossfire vr302 the right channel is not working properly and the gain and other adjustments make a pop and crackling sound. if you have any advice please let me know I'm looking at getting it fixed but there is no one close to me.
It's hard finding USB cameras that are any good that don't also cost an absolute fortune! I have to use OBS to record these otherwise it's far too much work and footage to piece together in editing, I don't make anything off these videos
@@barevids A few suppliers and one that I used to buy a lot from has over 30K pcs., the only problem will be the amount you will need. Most suppliers I used hardly sold small quantities. This one supplier has a minimum order qty. of 1K on most items, but since they come in tubes of 30 units pricing for 900pcs. would be $2.78usd. each if I was to buy them and that isn't including my markup. They used to be much cheaper, but most suppliers jack up the price when a item goes obsolete.
Que tal soy de México y mire un video donde dices que hablas español Te comento que adquirí el mismo amplificador Rockford Fosgate T15004 para reparar y lo pude reparar tenia daño en 3 canales transistores FQA36P15 y FQA28N15 en corto otros A56 y A06 otros 1AM 2A 2L G1 resistencias cerámicas 0.1ohm 22 ohms y 1 condensador 4.7uf 50v pero esos amplificadores son algo complicados para reparar Te felicito excelente trabajo
I watched this video not knowing a fucking thing you were saying but in total awe. 🤷🏻♂️
Real talk who ever own this amp DO NOT BREAK IT RUN IT AS NORMAL :/ this is a once in a life time repair
Damn that old school stuff. The old school stuff can last forever, if taken care of, and that is terrible. I mean it's surely not going to help make rich people richer if you don't have to keep buying new replacements to replace the new school stuff that last only a few years. Damn it, my 1976 Heathkit AA-1506 Audio Amplifier is working perfectly and still almost looks as good as brand new. This is terrible. And that's not all. My 1976 home made speakers, that each contain one 15" woofer, 2 mid-range drivers, and 4 tweeters, are still working and sounding as good as the day I built them. But it gets even worse. My 1978 Soundcraftsmen PE2217 Equalizer with Preamp, looks and works as good as the day I purchased it. Then comes my 1987 DENON DCD-900 CD player. It too looks and works as good as the day i bought it. And then there is my 1978 AKAI 630D reel-to-reel tape recorder, another damn thing that looks and works as good as new. And the other pain inflicting item, is my 1976 Yamaha CT-800 FM/AM Stereo Tuner with Exclusive NF Switching MPX Demodulator. Yep, it's tough, not handing money to the rich.
Yaaaay another video!!!
I was going to buy one of these blown off of ebay to repair about 8 months ago, but decided agaisnt doing so. Kinda glad i didjmnt due to the availability problems with the P channel fets.
Love the vids!! Keep em coming!!
My dad's mate used to have load of these absolute beasts! I remember how clean but powerful they were and always used to get a kick when we used to push them hard.
I often wonder while watching your videos, what you charge on average for these repairs, especially a repair such as this one with those tiny resistors and the time it takes to find all the faulty parts....
important to mention, that you will find any transistors in china but they won`t work or do even more damage as those bastards remarking transistors (and other parts)
I have a 800 x4 sound digital amplifier that I need repaired it is the older model and I really would love to get it fixed if you or know someone who can repair it for me please let me know.
I did not see that muffin fan running. Is testing it part of your final test process?
Perhaps as an old school guy @ 62 years but I've seen these teeny teeny little parts once before and I said "Ok I'm all for high tech stuff being made smaller and more compact but this is ridiculous". These parts are just too small. I mean put a standard resistor next to one of these and it is inevitable that they'll fail. I love my new tube amps and solid state stuff but these parts are a joke. PCBs are no ones friend. They flex and crack and a trace thats open is very hard to spot. These parts are a joke. Sorry...just saying.
My good friend, these parts you mention are massive. The resistors, capacitors and diodes in your mobile phone are only visible and serviceable with a microscope 😁 I don't mind it as long as the assembly quality and application are correct. Smaller parts are typically more efficient and suffer less from vibration damages since their resonance is way outside of that it would be subjected to in normal use. It also allows devices to be much smaller. If your phone or laptop was made with through-holes you wouldn't be able to carry it around haha.
I forgot to add something. Printed Circuit Boards have their limitions. Mobile phones today use these parts and I was well aware of that. Vacuum tubes or Valves as we call them here in Australia generate a lot of heat. If you mount a tube socket to a PCB, over time with cycled use, there is a high probability of a trace going faulty. I own a PrimaLuna High Power integrated amp. All of the components are wired point to point except for a few PCBs in very low voltage and heat areas. All the valve sockets are mounted to the chassis and they are surrounded by pencil sized holes to let as much heat out as possible. The 8 EL34s give me a linear and clean valve sound using the 4 ohm tap. I've been using this amp since I bought it 7 years ago and it has never missed a beat. The adaptive auto bias in this amp runs the tubes and analyses them 10 times per second....kinda like your EFI in your car. If a valve fails, the amp goes into protect mode and a red LED lights up next to the faulty valve. You replace it, shut the amp off which resets it. You turn it back on and no more multi-meters to bias the new tube. A guy in America left his New PrimaLuna amp on before going on a 6 month work/holiday and he nearly keeled over when he saw that the amp was on when he got back home. He got a tech friend to analyse them and because the plates were biased off, Everything was fine. He lost about 2% usage from the EL34s and the 6 12AU7s last forever. I hope that clears up my mistake. Andrew from OZ.
Boy do I love these old power series amps! The smallest of the bunch.. the T3002 is still my favorite amp to this day that I've owned.
Mine is the rf p8004. Was my first decent 4 channel, used it 2x2 at the time whould love to have one again
@BericBuilds- Those little amps, were powerhouse's, that were overlooked a lot.
I love them too I had the t3002 and the t8002
Always loved old school Rockford. My all-time favorites, though, are the 2nd gen Punch amps (non-HD). I had a 2nd gen Punch 150 way back in the day, and that thing was bulletproof. Sounded awesome too. Nice work my friend. 🏆🥇🥇🎖
Very enjoyable. Thanks for another tutorial. Wish you could send some of that Euro work my way. Need some more repair work that’s knowledge testing.
Thanks for showing how to set the bias pots. I have a pair of Rockford PR-2100 TYPE II that I bought back in the 80's, one worked and one was sold to me for parts. The only part that was missing was the turn-on transistor! So I had a collection of transistors and found one that made it work. I messed around with this amp and in doing so I "adjusted" one of the bias pots and not noticing any audible difference I turned it back to it's original position. After seen how critical this adjustment is I'm going to dig this amp out of my closet and put it on my scope (one identical to yours) and see just how far out of whack it is.. Thanks for the tip mate!
Rotel speakers from the 60s or 70s 😅😅😅
Mid late 80s mate
a little exaggeration perhaps... 😂
Just got rid of one. Had to send it to Canada from Wash DC, bout 120.00 and a pain in the ass! Ive got a pdf of the full schematic and owners manual if ya need it.
Omg Sam your finnaly back on RUclips glad to see you upload again in normal video form…a livestream would be pretty neat😎😎
I have 3 fosgate amplifiers on my shelf waiting to be fixed im having a hard time finding mosfets like those i dont want to pull them from working amplifiers
pretty sure those parts are readily available on the interwebs for cheap shipped
Yeah u can get some but them being genuine is the problem.
What state are in the silvery-color capacitors? They look like ones I've seen before as troublesome, tendency for all of them to go open-circuit. Maybe they ARE all open circuit and doesn't noticeably affect the perfoermance, being as it's a DC-coupled amplifer. I don't know this brand of amp, but some DC-coupled amps have an extra bootstrap bias thing going, on to acheive more gate-drive swing.
I'd give anything for one of those and the RF 4000 Luke that Steve meads got a video of one fxck I hat my life although I do have a silver DD M4A 😁
This series of amps was my dream to own.
How much would a repair like this one cost? Ballpark? An how much time did u actually spend on the repair? Great video an repair excellent work sir
21:27 isn't the glitches in the trace in the wrong place for crossover distortion? Maybe there's some kind of phase delay going on..
I'm glad to know that I'm not the only one who repurposes my resistor trimmings in such a fashion.
Did you try utsource for the FQA36P15?
What song was that which you tested first?
@barvids What band of smd soldering iron is this and the bent tube maker?
I still run a t10001 with a single solo baric 15 l7 had both over 12 years
Cockford ballsgate
Could you take an amplifier and inspect it to see if you can do some internal component upgrades. I have a Slapz Audio Shock 3k and it's the exact same amplifier as the Black Brick 3k as well as the Sundown SFB 3k. I would expect Sundowns 3k has upgraded components. Could you upgrade the components on the Shock 3k?
Leshine of China is the main manufacturer of all 3 amplifiers listed.
I have a old Power T1500.2 hanging on my wall lol
Doing any livestreams any time soon?
Man i could do with sending my amp to you!
Thats 1 hell of a unit there.
Always amazes me how well the Rockford boards wick away the heat
Arizona trunk tested!
So effortless... what a pro
Hello, what flux is that ?
Is that powerup whine/hiss the caps charging perhaps? Swear I've heard those noise from caps before maybe on SMPS. Beast of an amp.
Emitter resistors? Didn't you say the OPS is MOSFET? MOSFETs don't have emitters. Or, is this a hybrid MOSFET/BJT OPS?
aye the classic name for those resistors is emitter resistors as theyre on the emitter of a BJT class AB but with mofset final yes you are right there is no emitter but the reference name for those resistors has stuck, at least with me, lol.
@@barevids yeah, I get it. It's more likely to be "source" resistors.😀
I like the head cam.
Where in the uk, are you located, I have a bunch of amplifiers that need repairing?
Message me on my barevids facebook page buddy
Crazy thing. I have a 3k that's the same size. It needs to be fixed also. But i have not opened it up yet. To see if it resembles this Surfboard on your bench. Lol.
GENIUS ! 🔥🔥🔥🔥🔥
barevids i have an issue with a old crossfire vr302 the right channel is not working properly and the gain and other adjustments make a pop and crackling sound. if you have any advice please let me know I'm looking at getting it fixed but there is no one close to me.
We love a long bent nozzle.
Hi there Sam how do I get in touch with you about a amp repair ? Thanks
If you're in the UK message my barevids facebook page
Thanks!!!
I was wondering the other day where you've been, glad you posted this!!👍🏼
Cool biasing trick. Makes it real easy to find without tech docs. 👍
Loved it havent seen a vid from you pop up on my feed for ages gots me some watchin to do😊
😂 Those Rotel speakers are from the late 80's or early 90's
Did Derrick ever get back the the tar amp clone i think it audio pipe
Wow what a strike of luck finding those mosfets i cant even find those in the u.s.
cool video, those amplifiers still hold value even though there are less expensive options to choose from now.
spot on 🙂
For me repairing amps for heats now repairs on older fosgate amps are some of the hardest parts to find.
Full of great tech info as always!
Can you buy a better camera?
It's hard finding USB cameras that are any good that don't also cost an absolute fortune! I have to use OBS to record these otherwise it's far too much work and footage to piece together in editing, I don't make anything off these videos
Could you repair a Rockfordfosgate 3sixty.3 Processor? It shorted out accidentally sticking usb in the Ethernet port while it was on
Or maybe explain what happened and how it could be fixed
Gordon saves the day! LOL
FQA36P15 there's plenty of stock available, kind of makes me want to start selling electronic components again.
Let me know where please!
@@barevids A few suppliers and one that I used to buy a lot from has over 30K pcs., the only problem will be the amount you will need. Most suppliers I used hardly sold small quantities. This one supplier has a minimum order qty. of 1K on most items, but since they come in tubes of 30 units pricing for 900pcs. would be $2.78usd. each if I was to buy them and that isn't including my markup. They used to be much cheaper, but most suppliers jack up the price when a item goes obsolete.
Reply to myself rofl, Mouser shows the Ixys IXTQ36P15P in stock which I think is a direct cross to the FQA36P15.
@@lutach ahhh I always forget to check mouser as the shipping is very high to the UK ☺
Que tal soy de México y mire un video donde dices que hablas español
Te comento que adquirí el mismo amplificador Rockford Fosgate T15004 para reparar y lo pude reparar tenia daño en 3 canales transistores FQA36P15 y FQA28N15 en corto otros A56 y A06 otros 1AM 2A 2L G1 resistencias cerámicas 0.1ohm 22 ohms y 1 condensador 4.7uf 50v pero esos amplificadores son algo complicados para reparar
Te felicito excelente trabajo
De hecho en este video hay una parte donde claramente dice "SALIDA" cuando esta haciendo testing de los canales del amplificador
Beautiful amplifier
It's a 4ch BTW
I have a 4000watts orion xtr that has no output how can I plz get it to u I will pay
just replace the protect light and you should be good to go
Brother good job
Beast!
👍👍
Such a beautiful class ab.
Hey friend i didnt hear you mention what u think caused the issue ,? Speaker wires short and touch ?
I had it back in 2007 and it was mega amp❤ sick power it's under rated alot🎉 produce way more the spec sheet says😊❤
I had this one and mono lock same line same shape🎉❤ absolutely sick amps❤ was pushing great clean power 🎉
Yoooow❤