Electronic Repair- Sansui B-77 Stereo Power Amplifier!
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- čas přidán 12. 11. 2018
- 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.
- Věda a technologie
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!
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.
Awesome job Paul. I’m 68 years old and I can still learn new tricks.
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.
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
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
“Enjoy” is a *massive* understatement!
Thank you, Mr. Carlson! 🍎
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..).
Every single video, no matter what year, the same volume! Outstanding!
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.
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 .
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.
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
Finally someone who knows this stuff and is willing to help us. Thank you Mr Carlson!
Mr. Carlson makes even the most complicated faults look so easy to fix. Thanks for this great and informative video.
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 :)
That thing would have really made my eyes light up back in the 80s.
Probably one of the nicest schematics you’ve shown us.
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.
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.
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.
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!
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.
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.
40 years of electronic troubleshooting and you STILL teach me something new !
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!
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!
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!
That schematic is a thing of beauty.
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.
Awesome watching how simple and straightforward you work. Thanks for the great vid.
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.
I found this amp on the road. Hooked up to my desktop speakers. sounds good but intermittent channel issue. Great video.
Still have Sansui speakers from when I was i was in high school in the 70,s and they still sound awesome !
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.
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 !
Thank you Mr Carlson. Very nice neat little video. Just goes to show the 70's rocked....lol... even the schematics were better.
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.
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.
Excellent video Mr Carlson. Full credit to you for your patience and intuitive personality. I really enjoy your videos. Thank you.
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.
Even though I don't understand much about electronics I find these videos fascinating and addicting.
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.
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
How I love your silent intros! They really make me look forward to the show.
I'm a proud owner of Yamaha CX-1000/EQ-1100/MX-600 combo...but this machine IS BEAUTIFUL. I want one already.
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!
More mysteries explained, I love it. Thanks Paul.
Sold these amps in a stereo shop worked at in the 80,s… we changed out the last 5 green leds in the peak meters with yellow and red to give it that “extra cool” look to get the sale! Lol
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!
Excellent video, nice clear shots. Very easy to follow. Best part, no music. Thanks.
The best never rests....Looking forward to this.
Once again, excellent trouble-shooting and procedure. Outstanding... 10/10
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!
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!
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.
I loved the new picture in picture, it's a fantastic addition.
I've got one of these amps. Still sounds great! Have never had this issue with it.
Hmm i like your channel
I am impressed. Quick and easy, after seeing that! You're very competent and professional. Kudos!
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!
Golden! Can't wait to have the time to check out the projects on the patreon!
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.
Mr Carlson's Patreon class is hard to beat! Bar none.
Always eagerly awaiting your tubes! *So professional Well laid out and informative*
Vacuum tube displays were currently used on hi-fi devices, videotape recorder, and kitchen appliances too ( programming displays on hight end microwave ovens.)
I'm learning so much from this guy, love these videos :)
Don Rumato
The main idea of SANSUI desiners SUSUMU TANAKA and SUSUMU TAKAHASHI was to minimaze TIMD ( transient intermodulation disdortions) in audio power amplifiers which was the main cause of harsh "transistor sound". They did it by using patented DD/DC differential stage in input stage of power amplifier and gettin high SLEW RATE of output signal. They followed and developed the ideas of MATTI OTALA - ther co-member of AES (AUDIO ENGINEERING SOCIETY ) firstly presented in 1971. Result was achived and natural sound from vinil LP and tape decks started giving a lot of joy to sensitive ears by means of bipolar transistors and not only with tubes . Idea also was developed by ROBERT CORDELL from BELL labs . He used power MOSFET"s and write a wonderful book " Designing AUDIO POWER AMPLIFIERS " in 2011
Nice piece of testing equipment, Very easy to understand how it works. Thanks for all of the knowledge,love your work.
Aloha Paul! Another fantastic video you never cease to amaze me with your vast knowledge. I learn something every time.
I love these videos thank you sharing your knowledge and experience
Cant' wait for part 2 of the Supreme Vedolyzer !!
I'll never be able to use all this knowledge from you but so informative and easy to grasp how you explain things, thanks
We love you Mr Carlson... so methodical.
That is the coolest fastest de-soldering tool. Even at 1x speed. Super cool
I am fascinated with your videos. Absolutely brilliant, and professional. Thank you. 👍
Picture in Picture, awesome! Fantastic as always.
Excellent Paul , as always
Thanks Paul!
The VFD displays are just nostalgic!
Their tone, dullness and the colours just can't be replaced by 32 segments LED displays.
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.
Hello! My father still have this same Sansui device back home, a lot of memories :D
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!
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!
Thanks Paul. I can't wait to build my curve tracer.
You're welcome Robert!
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
beautiful power amp!! I love Sansui. Nice video. Thanks
another great presentation and troubleshooting video. Thanks
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!
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
Thanks Paul. Another excellent video. I learn something new every time.
That does it! I’ve watched the patrion videos a while ago and thought it looked cool. I’m building that sucker!
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!
Another amazing Vlog , Mr Carlson you keep out doing yourself . Your friends from newvyork
Great Video Paul,,, Thank you..
Anyone subscribed with more than a simple passing interest should head over to Patreon and kick in a minimum at least. It only took me a few hours to move up from minimum to a "bit" more once I saw the quality that is there for any Patreon member. Mr Carlson, Kudos again! I have a small stack of projects I need to turn my attention to including a nice early 80s vintage Yamaha power amp that "let the magic smoke out" on me a few years ago, I could not bring myself to "recycle" it into parts or put it in a trash bin. I also have a Bogen tube PA amp that had the back panel get wet. NO idea how much damage was done, we have owned it since new and I was sick when I saw it wet in storage. I DID have a good outcome in repairing a Sony monitor that lost an IC. My first attempt at micro soldering and it worked! I now use that monitor along with a video camera to be a 20 power microscope. Another very handy tool to have on the bench!
REALLY enjoy these trouble shooting videos, Paul. Thanks for another Coffee & Muffin morning video. :-)
Very well done, always informative... Thanks for posting.
Looking forward to that safety video!