Wouldn't hurt anything to use them.
Those are shorting plugs..
Anywhere there is dried SONY glue.
I did find some Sonyshat glue under the heat sink mounted transistors in the center area of the board. Plus corroded resistors in front of it. What other weak spots could be here....poking around.
4.7KΩ 1/4 watt
No... There just to eliminate any back ground noise picked up from the unused phono inputs..
Thank you much.
I’d measure those caps for capacitance and ESR before automatically changing them. Recently I got a semi-decent capacitance/ESR meter and went through a couple of hundred caps I’ve changed from different units. Turns out over 99% measure fine (both C and ESR) and could have been left alone.
You keep all your old caps ?
I kept my old Black gates & tossed the rest. I'm not re-capping this one. None of them are buldging or swelling. I'll take my chances this time. Ever had a piece not sound better after a re-cap though? I don't trust those smallest electrolytics beyond 25 years but, walking away from this one.
Yes, for a while anyway, in a tagged plastic bag to know where they came from.
LOL … yes. It didn’t sound worse but definitely sounded different which I didn’t like. This is a highly subjective area mind you.
No, I remove the caps from circuit for testing. In some cases it can be done in circuit but I don’t take chances.
Yes, I've been a re-capping whore since the covid era. I'm starting to think the medium,large, & XL caps are better left alone on our Yamagoodies. I'm experimenting on this piece. I believe the smallest electrolytic caps need swapping after 25 years. Here's my analogy in lieu of electrolyte dry out. Let's say ya soak 5 sheets of paper towel in water, and then dunk the whole remaining paper towel roll in water. Set them both outside in the sun & see which dries out first. I don't trust teenie weenie caps in vintage pieces, those little pricks often fail under load no matter how good they test.
Yeah, I agree that the really large PSU caps are a hard decision. So far I have not found any out of spec, and they are expensive and usually challenging to find the same physical sized caps. If you can't find the same physical size then it gets quite involved to drill or make accomodations for the different sized caps.Yes, I've been a re-capping whore since the covid era. I'm starting to think the medium,large, & XL caps are better left alone on our Yamagoodies. I'm experimenting on this piece. I believe the smallest electrolytic caps need swapping after 25 years. Here's my analogy in lieu of electrolyte dry out. Let's say ya soak 5 sheets of paper towel in water, and then dunk the whole remaining paper towel roll in water. Set them both outside in the sun & see which dries out first. I don't trust teenie weenie caps in vintage pieces, those little pricks often fail under load no matter how good they test.
This is my knowledge share and not a pissing match, as I enjoy your feedback. Peace out Sparky.
That's interesting to pull caps, test and reinstall. I feel like since I have taken the time to desolder, I might as well install new. I do like the idea of getting into the unit and doing all of the caps and any known issues, service bulletins etc. So then it can be done and good for another 30-40 years. Especially if I am going to sell it to someone. Maybe in the future if we can no longer get the caps we need we may have to do be more selective.
Not sure what you mean by interesting, it’s called following the data. If the caps measure fine in value and ESR, they go right back in. I have other things to spend my money on. The capacitance meter has been a, quoting yourself, a game changer for me. LOL
