Hi, thanks for the video. One question, why didn't you just recap the whole amp? Now there are old caps and new caps in the amp that can have effect on each other.

G,day from Sydney Australia. What is the brown component on the board. Looks like the colour of an old wax cap? Also the little brown round one; could be a fuse or cap? Thank you buddy. 🌏🇦🇺

Nice work

love these videos

Another Goodie Joe. I see some of the comments are Lamenting what I've said in the past couple videos. *You Are a Good Teacher* There are Good repair Techs on YT but they've seem to have lost track of who they are making DIY videos for, the Learning. After all the people that ARE In the know probably aren't watching their videos anyway. lol Talking way over their heads Assuming. The Ol' saying "Those who don't know teach" they know everything about a subject but don't have the Foggiest Idea how to get it across to the Newbies. Please never forget to keep it simple for the DIY noobs. Once again Thank You for making these videos for US.

What a cute little amp! Always love Sansui I have an au717 and the matching tuner that I bought in the seventies and still going strong.

Same issue. Replaced the capacitor, but fault persists. 😢

These amps are 50 or so years old now, all they need is some TLC to stay in the music game. Thank you for your time!

Wow, really enjoyed and appreciated watching. Very detailed teaching video. Great lab set-up, and the scope with B&C to bananas from speaker connections measuring Hz sine waves. 🌏🇦🇺

nice video hmm what is the name of that spray you use for pot and contacts ? 🙂

Love the vids , very chill, very cool . Tyvm

I took a chance buying this, Joe.. and you saved it! Another one brought back to life :) You’re the Man Cheers!

Great job Joe you made quick work of that one!!

That was fast. 👍

You are a good educator. Keep up the good work. I like the videos on the vintage hifi.

Thanks so much, Joe. Great seeing the service in action :) Running Beautifully now! Terry

Hi Joe, what kind of gloves are you using: nitrile, latex, vinyl? Don't they cause your hands to sweat? Thanks!

Thank You Joe -- I know the camera slows the work time. Your Choreography Is Some of the Best on solid state for me as a Newbie. Much Appreciated. Enjoying the Videos.

Nice 👍

A lot of bla-bla

good jobs

LOVE this one Joe ! I have restored one , also was my own Dad's and replaced a lot of parts ...complete restore except for a handful of transistors. And I didnt mess with the tuner much, few caps and left that alone. What memories this brings back of when I did that especially the damn misprint misleading to the wrong pins. Really love that receiver , paired with the right speakers it really rocks !

I had a pioneer sa8500II which was around 70 watts per channel. Very well build wth two power transformers (dual mono). I didn’t like the sound it was dry not that much bass compared to a Sansui, Marantz or Nad.

Joe. Your channel is highly appreciated.

great video🔊sound effects 🔊👍

I always look forward to your videos Joe. Brilliant work. If I could make one suggestion, whenever I do any electronics work or gunsmithing, I put all my screws in a magnetic bowl and have it set on a metal vise.

Nice! I have one connected to a RT 707. The board was in bad shape when I got it from Goodwill, many broken traces. It plays perfect now.

I have a KA-7300 purchased new in 1975 or 76...

Joe. Did you get my answer? I am in West Virginia along the Ohio River !

Learned a lot from watching you tackle these jobs,thankyou.Great job on this baby!I've got one of these in my vintage collection and love the look and the sound!Not sure if you've done it yet but your subscribers would love to see a video someday of your own personal set up and go to vintage gear!

Joe. How can I get hold of you for some work? Are you on Facebook ? Thanks

Joe. How can I get a hold of you for some work. Are you on Facebook? Thanks

There is also some "special" oil you can buy for this turntable. 2 to 3 drops is enough in the little hole next to the axle in the center of the platter. I actually lifted up the whole top on the motor so I could clean the axle bearing. But is a little bit scary to do because of the tight tolerance. I also had problem eith the speed. It was doing a bit of fluctation and i had to tune everytime. I just cleaned all the pots and that was enough. Also cleaned the pots on the circuit board. There is two pots there that also controll the 33 and 45 speed. I hope my lamp will last, i guess that was the hardest work on the table. Was it just to change the bulb or did you have to drill it out? If i remember right the bulb is kind of molded in a plastic form that sits in the beutifull aluminium house. Have s nice day!

Can you tell us where these power pack came from. What person or company made them.

So where did you get those STV4H varistors?

40:27 Excelente reparación, poseo un Pionner STK, 780. Los STK fallaron. Por favor indíqueme en dónde puedo adquirirlos y seguir disfrutando del excelente sondio GRACIAS. COLOMBIA.

THE GLOVES..........................................WTH

Every once in a great while, my 737 relay will click in and out too. But otherwise works great. Not sure why it happens. Relay also makes a slight "pop" noise through the speakers after first turning it on. Any explanation?

great tech work! and very educational

Restoration. Calibration. Through trouble shooting. How much it was charged?? 😮

Thanks ! nice work ! 🙏👍❤

Nice work Joe. It must be a regional thing to refer to things as "my" instead of "the". i.e. "They are in direct contact with MY voltage regulator...". I just find it interesting. Do you live in the North or Canada?

Was that last transistor you changed the one driving the relay by any chance? In my experience, it’s a very common issue for that to fail on mid/late 70s pioneer units. For whatever reason, they didn’t fit a flyback diode so over time, the relay kills the transistor driving it. I’ve changed that transistor with a modern equivalent (can’t remember the part number, ZTX something), but I also fit a flyback diode across the output to drain any flyback voltage to ground. I’ve never had one come back… not touched one at all in nearly 10 years though because I’m too busy elsewhere.

As an Ol' Tube guy & Newbie trying to learn solid state this video has been Very Helpful. One of Your Best for a Noob like me. Thank You Joe for making these videos for us.

It would have been interesting to test the transistors with a VI curve tester. It makes damage visible, especially in semiconductors, that cannot be detected by a multimeter or transistor tester. 👍

Joe is a rock star! Joseph est une star! Personne exqui! Merci, thanks!

Man they knew how to make a good looking amp back then, just needs a couple of big meters :)

Great repair! The SX-737 is one of Pioneers best sounding receivers. How I know? I own one.🙂

Great video, regards

Awesome! I bought my SX-737 in 1974! It was the star of many parties :) It sits in its original box downstairs. I should get it out and fire it up to see how it is doing. Thanks for the great video.