Electronic Repair- Sansui B-77 Stereo Power Amplifier!
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- Опубликовано: 20 сен 2024
- Look over Mr Carlson's shoulder as he troubleshoots and repairs the display section in a Sansui power amplifier. Learn about using a signature tracer for incredibly fast troubleshooting of electronic circuits and components.
Learn about electronics in a different and very effective way, and at the same time, have access to Mr Carlson's circuit designs! Go to Mr Carlson's Patreon page, click here: www.patreon.com/MrCarlsonsLab * (EDIT) UPDATE: New Curve Tracer video just launched on Patreon!*
Good video ! I remember building a V.U. meter in high school electronics. It too used the LM399 chip, but it used leds instead of a VFD. The front end used the LM324 chip to clean up the signal and provide the different frequency spectrums.
@Dave Micolichek I guess it was called a frequency spectrum meter. I guess I wrote the comment wrong. Thanks.
@hvacr tech you should see my work benches !
Mr Carlson's Lab pretian
Mr Carlson's Lab patron
I highly recomend Mr. Carlsons patreon class. You will in my opinion learn 10 times more then taking a formal class, at such a tiny price I can afford it .He does examples in point to point, surface and through all, sometimes making the same device those three different ways enabling you to better understand each process. He also shows you the pit falls and how to do it safely for you and the equipment your working or learning on. You also gain valuable experience learning the testing equipment he shares , building and explaining them in laymens terms . Thank you again for sharing your experience and knowledge Mr. Carlson.
Cleveland P.
You're very welcome Cleveland!
Watching these sessions has been such a blessing to my sanity. He's reminding me of so many things I have forgotten. I wrote him a nice long note telling him he was not only fixing equipment he's helping me as well.
Thank You for your kind feedback Jerry.
Awesome job Paul. I’m 68 years old and I can still learn new tricks.
i've studied electoincs in the past , and i was working on my home work at a gas station when a guy saw me doing it .. he took me under his wing and gave me my first job repairing monitors for compugraphic computers , but i wanted to brush up on stuff and mr carlson you are very very informative, taking me back to my electronic coarses and my teachers , but you sir are the best!!!!!!!!!!!!!!!!!!!!!!!!!! i did have a huntron 2000 curve tracer but had to sell it years ago when times where tough , but now im building a curve tracer and have renewed my passion for electronics
First of all, I admire the work you do. I've watched your content multiple times over.
Matter of fact, your content often reminds me of my English teachers. I was famous, or possibly infamous, for adding extra words to my sentences. And here you are, one of the most intelligent people I have ever seen, and you do the exact same thing!
You add "as well" to many of your sentences! It brings me much joy!! I'd like to go back to my English teachers and tell them that the smart people do what I do... "as well"!
Mr Carson Sir . I am 62 years of age and a lifelong Electronics Enthusiast . I have learnt more in the Two years or so I have been following you than I did in all the preceding time. Thank you so much .
Every single video, no matter what year, the same volume! Outstanding!
Your videos typically make me feel stupid but I love watching them and seeing a genius at work!
Looking back as a young tech working on home stereo and TVs in the late 80's/ early 90's I can look at that Sansui schematic and really appreciate it. A work of art compared to today.
Nice job finding the faults.
Cheers,
- Eddy
I've worked as a technician too, in this years, vintage hi-fi equipments where well and build for durability, not "buy, use and throw away" as nowdays !
The oldest hi-fi system i own, is 45 years old, it's a "compact studio" designed German device ( really current in the 70') , still works, but certainly needs à serious reconditionning ( recap, and readjustments..).
A new Mr. Carlson's Lab video!!!! Best day this week!!!!
IKR ! I already hit like even before watching knowing its going to be good regardless.
@@patprop74 Same here!!
patprop74 Same
“Enjoy” is a *massive* understatement!
Thank you, Mr. Carlson! 🍎
I follow you from Istanbul. Everything is great. Thanks to your excellent English, I improve my English and improve my amateur electronic hobby every day. Thank you very much.
In the true tradition of the Ham community, you share your hard-earned knowledge. Thank you. My dad and I made a curve tracer out of an old Heah Kit scope I think it was 65 or 66,, really foggy memory.
40 years of electronic troubleshooting and you STILL teach me something new !
I recently had to diagnose a no start electric motor on a 1981 Singer furnace in one of my rental houses. I am not a hvac tech, or electrician by any means but have learned enough in my 43 years to get me into trouble. I was extremely impressed by the schematic neatly tucked inside the furnace that made it very easy to repair. I wish more companies did this today.
Thanks, Mr. Carlson! You keep showing me more uses for the Signature Analyzer (known as “Component Test” on my scope). I appreciate how you cut through the complexities to show us simple ways to troubleshoot.
Finally someone who knows this stuff and is willing to help us. Thank you Mr Carlson!
Hi Paul, great repair job and video. I love how the curve tracer works so well to find a faulty component(s). I notice that you have moved some gear around in the lab. :-P I see (and hear) you are using a different desoldering tool. It doesn't sound as robust as your revved up Hakko 470 does. That thing really growled. I also am impressed with the quality and attention to detail in the Sansui schematic. With modern electronics CAD programs, there is no reason that that level of detail (including illustrations of the components) could not be included in every schematic with the press of a button. It took designers countless hours of hand drawing to create those schematics in the 70's and 80's. So there is no reason to not make "good" schematics. Thanks again so very much for the videos and the graduate level education you provide the youtube community!
Thanks Gary!
Mr. Carlson makes even the most complicated faults look so easy to fix. Thanks for this great and informative video.
That thing would have really made my eyes light up back in the 80s.
Probably one of the nicest schematics you’ve shown us.
Hello, you have great and informative videos! I have been fixing electronic gear for over 35 years and still pickup some new tips and tricks. I have a very old Tenma analog oscilloscope that has a "Component Tester" built-in which runs the scope in a sort of "X Y" mode and looks and works just like your signal tracer. I get all the same readings when looking at Transistors, diodes, regular and zener. I thought I was going to get rid of the old analog after purchasing my Digital storage O-Scope but it is still very useful for a few reasons. Keep up the good videos!
I'm impressed you can say solder correctly. There's a lot of soddering going on south. The tracer is gold. Great video.
Soddering! Lol! Sounds funny! Is soddering carried out by sods or sodderers? Cotter keys instead of split pins!
Great, it's like school... but it's coooooool school! There is so much info you are so generously putting out in these videos, it's really quite something; and so, a gracious thank you is in order. Thanks dude!
You are very welcome Mike! Thanks for your kind comment too.
I'm so amazed this troubleshooting. Thank you Mr Carlson. And I'm seconded to Mr Cleveland for highly recommend everyone to take electronic course on patreon. If you have a few knowledge in electronics it will accelerated through this course, what are you waiting for? The magic revealed in there!
Excellent video, nice clear shots. Very easy to follow. Best part, no music. Thanks.
You are like the "ELECTRON WISHPERER" it is as if you read the device's minds 🤣🤣. I have watched and been learning so much from your channel and never failed to be amazed at your in-depth knowledge of electronics and expert skills at fixing the problems
HAHA, I was working on a project by myself today and caught myself saying "sodder" instead of "solder"...LOL, I corrected myself as I talked to myself reminiscing of the vid in which you explain why you are sure to pronounce the "L". Just something funny I found myself doing today. Thanks again for being one of those teachers that really stand out as being a great teacher.
Cheers to you Mr. Carlson.
Even though I don't understand much about electronics I find these videos fascinating and addicting.
Excellent video Mr Carlson. Full credit to you for your patience and intuitive personality. I really enjoy your videos. Thank you.
Just found you. Don't understand anything you're saying. But I couldn't shut you off. I loved it. I can't imagine the experience and education for what you do.
That schematic is a thing of beauty.
Our electric shop teacher in high school taught us to use a signal tracer. Never used one since, and your video shows me what I have missed.
Vacuum tube displays were currently used on hi-fi devices, videotape recorder, and kitchen appliances too ( programming displays on hight end microwave ovens.)
Still have Sansui speakers from when I was i was in high school in the 70,s and they still sound awesome !
I had one of these. One of the cleanest sounding lower power amps Ive ever had. Wished I'd kept it. It was a gift to me from someone cleaning out there garage. I had 8 good heavy hard use of years out of it.
Amazing... your lab looks like the international space station.
Greetings from France
Have you seen how much equipment a real world every day production tech actually has on their bench? The lay person would be surprised how little there really is. Not knocking him but this is television with all that goes with it. 99% of that stuff is the set.
@@InsideOfMyOwnMind that said.... i don't do "television" but to tell you the truth, i would set my bench up this way if i had the option :)
'course, i always wanted to be an astronaut.....
@@InsideOfMyOwnMind You maybe forget that he's a collector, and also a working engineer - not *JUST* a "Yoo Toooba" - what do you think he does INBETWEEN videos? He works for $$ - a REAL, PHYSICAL WORLD JOB.
@@unlokia Thank you. I wondered about that. In general a person is only seen as deep as what you've seen them do which is always understated in video.
@@InsideOfMyOwnMind If you look through the videos almost all of that equipment has been used at some point. Mr. C Frequently remarks against creating shelf queens.
Greetings from the UK! Love watching your videos! I had a Sansui A-60 Amplifier which was at times problematic but i drove my parents crazy blasting out my 'boom boom music' I miss those days!
If you were my neighbor, I would sign over a debit card because I would be bringing so many things for repair. So much vintage audio fetching big bucks, so little experts like you ! Having a hell of a time finding a tech for a Marantz 2600. Likely output relays, but a full diag / restoration is desired.
with all my respect I think is time for Carlson to have the camera pointed more at him than the equipment you have it is impressive that you have all that but equipment without a user is just a bunch of gizmos with no user just have a view of yourself, people might think that you are just showing off you know what I mean? you are the most important person and you are the one who deserved to be on the center of the screen than the equipment by the way I love your channel :)
How I love your silent intros! They really make me look forward to the show.
Thank you so much for sharing your knowledge with us. Always a treat to see one of your videos. Very interesting to see the curve tracer at work.
Mr. Calson's Lab has inspired me. He is a great person to learn from. I have inherited some old radios, a Philco 96 Highboy, and a Zenith 8A02. I have played the Zenith until the dial belt broke. Don't criticize yet, I didn't give a second thought to leaking wax caps until recently. I'm now starting the restoration process on the Philco, and hope to have it playing by Christmas. The Zenith will soon follow. Thank you, Mr. Carlson, for the inspiration. It will be nice to listen to BBC on short wave again.
You're welcome Chad!
I love these videos thank you sharing your knowledge and experience
Amazing video. Love the way you have explained every single step and love the tools you are using. Signal tracer is great!! The curves looks like an scope working in XY mode.
And another top notch video Paul ♥ And yes, THAT'S what I call a schematic!!! SO NEAT, amazing job indeed by the tech at Sansui, hats off to them !
We love you Mr Carlson... so methodical.
I know what you mean about quality. I have a AU-9500 Sansui from 1975. Still performs like it did back in the day.
The cover has never been off, till last week. I sprayed the pots. Thanks for the video Paul.
I've got one of these amps. Still sounds great! Have never had this issue with it.
Hmm i like your channel
Beautiful hand rendered artwork, with a gorgeous VFD up in front!! AWESOME! I put a new non-standard VFD in one of those 1980s Heathkit synthesized output ham radio transceivers. I remember getting a free tiny CRT television AM FM SW CB radio for attending a sales pitch for a time share in Nevada. The schematic for that is a thing of beauty! Wave forms galore, signal paths, diagrams of every component and even a quick guide to the most common problems. That RCA scope reminds me of "The Octopus" test circuit for an O Scope. OH HO! IT IS AN OCTOPUS & A Sine WAVE GEN ON AN OLD RCA Bread n Butter scope!
Very cool trouble-finding method! Made me realise I should be doing more of this. I have a Hameg HM604 with a 'component tester' built into it - basically a rudimentary curve tracer. It's strange, I never thought to use this to find problems with in-circuit parts before. In my mind, it was just there to test desoldered parts and invdividual components of dubious history or origin. Turns out I was pretty much completely unaware of the very powerful circuit diagnostic tool I had been sitting on! I'm aware of the possibilities now, thanks! That old CRO is going to be warmed up more often at my bench now.
Oh man. I loooove watching your videos Mr Carlson!! I know nothing about the stuff you do, but you sure make it very interesting with your excellent way of explaining and going through parts and telling about it's functions.
Your knowledge is really impressing. And I also love the looks of the tech you restore and fix. Knobs, meters, buttons and all that sweet stuff! Greetings from Sweden Mr Carlson.
I appreciate that!
I am impressed. Quick and easy, after seeing that! You're very competent and professional. Kudos!
I loved the new picture in picture, it's a fantastic addition.
I love listening to your show always extremely informative and always spot-on thank you for the time that you spend and creating it and producing it for us greatly greatly appreciated again
Thanks for you're kind words Glenn!
I'll never be able to use all this knowledge from you but so informative and easy to grasp how you explain things, thanks
Awesome watching how simple and straightforward you work. Thanks for the great vid.
Thank you Mr Carlson. Very nice neat little video. Just goes to show the 70's rocked....lol... even the schematics were better.
This is just up my street.
As usual no matter what content Paul provides for us I love it all.
Good to see you your looking very well
Your audio quality is stunning! There are many channels that could learn from you when it comes to audio and video quality. Keep up the great work.
What else would you expect from a world-class electromechanical video/audio enthusiast?
I'd wager the equipment used to make this channel's upload content is likely in the best shape of any YT'er.
Yeah he's using a $2k microphone & probly a $2k valve preamp mate! I'd expect no less!
The best never rests....Looking forward to this.
I'm a proud owner of Yamaha CX-1000/EQ-1100/MX-600 combo...but this machine IS BEAUTIFUL. I want one already.
The VFD displays are just nostalgic!
Their tone, dullness and the colours just can't be replaced by 32 segments LED displays.
I am fascinated with your videos. Absolutely brilliant, and professional. Thank you. 👍
I'm learning so much from this guy, love these videos :)
I found this amp on the road. Hooked up to my desktop speakers. sounds good but intermittent channel issue. Great video.
I think this is a good basics and educational video. Lots of useful reminders even for the more experienced. Don’t know about the USA but even live chassis were common back in the day. Never used a signal trace. Very interesting.
Hey man! Nice seeing you here. This weekend I'm going to catch up on your great videos. Been busy with work. Cheers!
@@fullwaverecked Not been doing anything interresting recently but your always very welcom to drop in
Paul, as a teenage TV & VCR repair apprentice, in 1991, I remember being given LOTS of old VCRs, and smashing the fronts off the VFD displays and strumming those steel wires like a mini guitar - I still remember the sound and the smell of the "getters" :-) hah
Those poor tubes.. LOL.
It's nice to see someone else using a tracer. I have the privilege to have a newer Huntron on my bench (Company purchased) and I really do use it at least once or twice a week. Keep up the great work!
Mr Carlson I've been watching your videos for some time now and while I only have a rudimentary understanding of electronics I find them fascinating and educational. Now how about tackling the most difficult electrical repair of the modern era. The scourge of pulling out last years perfectly working Christmas tree lights only to find half of the strand working! There must be an easier way to fix then the trial and error method of replacing every bulb one at a time. Thanks!! Merry Christmas/Happy Hanukkah!! :)
Just aquired the complete set inc the preamp and tuner. Beautiful looking.
Aw maan that must be awesome! You lucky guy! What speakers are you using? I built myself a pair of 'fullhouse' Majestic speakers from the Aussie 'Silicon Chip' magazine. Massive monoliths with subwoofer bass! Cost me nearly $3k but I couldn't be happier. They go perfectly with the Ultra-LD mk4 integrated amp I also built.
Toujours aussi plaisant et instructif de suivre tes vidéos !
Merci pour le partage !
Always so fun and informative to follow your videos!
Thank you for sharing !
Thanks George!
Great job, i really enjoy watching these videos.
Loved the video. I haven't used a curve tracer since I was learning electronics back in high school. Thanks so much for reminding me what a powerful tool that can be in troubleshooting components.
You talked about displays and E.L. lamps. At one time, I worked for a co. that made trainers for NASA. One of the trainers was the LEM (lunar excursion module). All of the displays were back lit with E.L.'s. They were made on ceramics not plastic for very rough service. These types of units were eventually made into night lights that glowed green. BTW, I sat on one of the couches with all if the meters and gages lit. IT WAS AWLSOME!
Once again, excellent trouble-shooting and procedure. Outstanding... 10/10
Always eagerly awaiting your tubes! *So professional Well laid out and informative*
Mr Carlson's Patreon class is hard to beat! Bar none.
Golden! Can't wait to have the time to check out the projects on the patreon!
That is the coolest fastest de-soldering tool. Even at 1x speed. Super cool
Great video as always Paul. What a wonderfully stereotypical (pun intended) piece of 80s gear. More circuitry dedicated to the blinkenlights than to the actual amplification. I have an '89ish Sony component system that has separate custom VFDs for everything from spectrum analyser and tuner frequency to a diagram showing the state of the CD changer. I don't use it, I just keep it as a reminder of when we felt we needed flashy lights and screens for absolutely everything.
More mysteries explained, I love it. Thanks Paul.
A couple of General Motors cars had vacuum tube displays as such and I used to repair the dashboards in the same manner very nice tutorial
Aloha Paul! Another fantastic video you never cease to amaze me with your vast knowledge. I learn something every time.
I've built hundreds of Heathkits of all kinds, especially audio. Their designs were superb for safety.
Back when Sansui was a name to be reckoned with.
They're still a name to be reckoned with but for different reasons lol
I had a Sansui 9090DB Quad SQ amp/receiver back then when the Sarasota radio station (Quad 102.5) was broadcasting in SQ Matrix. I t was kinda cool with the 2 channel/4 track Sansui SD 5000 reel to reel that I used to record the new albums they broadcast every Friday night.
The 9090DB had Dolby FM but not SQ. All 4 channel models were QRX-xxxx.
Probably right, I don't really remember exactly what Model it was. That was back in '74, but it was def QS which I had bought and used for the aforementioned radio station receiving..
@@nfergus11 QRX-5500 maybe ? I just restored one of those for a customer a few months back, amazing piece of equipment.
The pinch clip demo at 11:18 is very appreciated.
great channel, one the best of it's kind !
Thanks Victor!
I know many of these videos are troubleshooting/repair focused but I'd love to see more walkthrough of schematics even that are working correctly. I'd like to hear some of the design techniques that the engineers where using back when these devices were made.
beautiful power amp!! I love Sansui. Nice video. Thanks
The noise of that desoldering tool reminds me of an A-10's 30mm cannon.
Cant' wait for part 2 of the Supreme Vedolyzer !!
II learned about the repair of the spectrometer by using the siginture analyzer it is a good troubleshooting tool. Thank you for this video
alan kellerhouse
What a fantastic marvellous video. I have zero repair skill, But love audio
Glad you enjoyed it Joe!
Thanks Paul. Another excellent video. I learn something new every time.
Excellent Paul , as always
Thanks Paul!
Nice piece of testing equipment, Very easy to understand how it works. Thanks for all of the knowledge,love your work.
What better than a good old power amp to take a break from a rabbit hole
I agree!
Awesome video Paul!!! you are a genius in electronics, I'm also looking forward for the vedolizer video.
I always learn a lot from you. Outstanding. Thank you sir!