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jayjayuk, hi! Why don't you just put everything in the new board you have, seems like there is quite a problems in the old one. And about the problem with rear left channel, don't thing it is in op-amp. And it is just one opamp for both rear channels, and if you say that everything was running for a while, then maybe, something overheat and make a mess. And if the opamp is broken, in my case there is almost no sound, barely audible. BTW, i like the bottom side of your board, seems clean and elegant. Good job!
I've had problems too. This board is likely very crappy and the tracks rip off very easy, if i go too over with the heat. But the f@cking taiwans, made every cap legs bend to the track, and i can't heat them properly with heat pump, and got to apply a little more force pulling, and then the track is almost goner. I changed almost every cap in the control pod, besides that ones that
@ramachandra said to be replaced. For them i considering either Nichicon FG, or KZ. Also for the TDA caps. I have heard recently one AV receiver Sony,with my speakers, and it turns out, that the Sony was much more mud sounding in high range, with a lot less clarity and definition, but mid-low end was much better then mine. Overall i liked the sound(just sats, no sub) and Sony was entirely with FG caps. So, now i am wonder witch ones will fit better - FG or KZ. Datasheets said that KZ is premium grade, but FG got very good bass. Here my system for now, the bypass caps will be putted back after i decide what caps to place in that position.
The main filter caps are now replace with Nichicon KG. Now i am in auditioning the results with elnas and KG. I know that they need some time to settle, but my first impressions are very positive! It is amazing how precise and defined sound became, The lows are good, deep, hitting absolutely correct, very tight and with fast response, witch however, in some occasions results in some lack of the... how to put it, maybe sustain of the bass, to fill the sound gaps between sats and sub. Like the notes are damped very fast after they hit. But all and all, i am very satisfied. That's why i amd considering FG series instead of elna or KZ, because i am afraid that over detailing of the sound will become not so peasant. I need to add some mid-low present to the sats, because they are more of the transparent side, and sounding more like in surround, i want them more direct.
Also wonder this- the pre amp 5 caps are for speakers. What if i increase the capacitance of the, i red that this may give a better lows? Is that correct? Also i replaced the two caps that are separate with MKS2, cause with axials, the brightness was over and needed some round and smoothness.
@ramachandra what will be, if i use the MKT, that i have bought for bypass, for that position? Because you recommended MKS,MKP films?