Sony TA-N88B tune up

[ebk231]

Hello
I have a Sony TA-N88B that is fully functioning and I would like to make it safe to use daily. The only issue is a little thump when turning off the power. Does anyone have experience with this amplifier? I have searched and the info is hit and miss. I know that the power supply needs to be in top shape. I plan on replacing on the electrolytics, but what else should be addressed? Any specific weak links I should address?

 

[FileFixer]

I have a service manual but you can`t to do anything if you dont have osciloscope. This is almost full digital power amplifier with Pulse-locked power supply. You can to recap this amp but why to do complete recap if amplifier work properly and spend some money on blind work?!

 

[ebk231]

You dont consider replacing 40 year old caps a good preventative measure? I dont think many of these amps are still surviving in original condition. I really just want to be able to safely play this loud and long without hurting the vfets. I do have scope but knowledge on using it properly is another issue. I got a great deal on the amp and dont mind spending some money on it.

 

[ebk231]

Well I started to work on it and make a cap list. I was hoping to get some help selecting caps.
The big ones are 2200uf 200v and 5600uf 100v . I would like to use some that are the same series for of these. I found some LNT series from Nichicon
https://www.mouser.com/ProductDetail/647-LNT2D222MSE Value wise an exact match

https://www.mouser.com/ProductDetail/647-LNT2A682MSE They dont offer 5600uf in this series but I found these at 6800uf. What do you guys think about jumping up to that value and these caps in general?

 

[ebk231]

Got a thread going on diyaudio, I really could use some advice on cap selection.

https://www.diyaudio.com/forums/solid-state/335882-sony-ta-n88b-recap-selection-advice.html

 

[WaveSeeker]

Got a thread going on diyaudio, I really could use some advice on cap selection.

https://www.diyaudio.com/forums/solid-state/335882-sony-ta-n88b-recap-selection-advice.html

Did you complete the project? If so, what did you end up deciding re. which components to replace with what, and has it been working well?

 

[ebk231]

No I toasted a couple vfets. I have a way better understanding of the procedure that needs to be done before installing the vfets. I didnt go through and check all the waveforms before firing it up. Im on the hunt for the 2Sj28's and I when I find them Ill give it one more shot. I have had great success with my restorations of the TA-E88, E86, and N86 and enjoy them all very much.