New problem

[cjkpkg]

OK

I have been listening for a while now and something has been bugging me. One channel is different than the other beyond the obvious recording nuances.

One channel seems to reach lower and higher - more complete frequency response - than the other. Would this indicate a fried input/output cap? The resistor values still all check out but one channel as a result of the top and bottom end missing seems louder than the other.

One major disappointment of this board has been the weakness of the pads when repairing-resoldering items to the board. Its almost a one-shot board. I have an aikdio and simplese board with a few desolder and resolder jobs on them and never destroyed a pad.

I am just debating whether its time to scrap the board and go in a different direction. I have a feeling that monkeying around with input/output caps will wreck more pads and make me further frustrated.

I would like a TA2022 project now that I have a good Xformer and all the other stuff - but ideally I would like to make this amp10 shine.

any suggestions are appreciated.

[Scratchy]

This may still be related to an old problem...

Reverse the inputs from your source to rule that out.
Then reverse your speaker outputs to rule out your speakers.
If the problem remains on the same channel, then you have problems with your input cap, output filter (inductor) or soldering on that channel.

***Always clean PCB before applying power with current limiting resistor***

[ported]

good advice so far

getting to the input caps is tricky on 10 - I wired mine to caps mounted off the board - you only have to do that once then you can try different caps at will.

having said that (off topic) not convinced of any major diffrences between resonable type caps (the ones supplied are pretty good) - for me the change has to very noticable and somthing I am convinced about from session to session - I cannot afford 50 GBP and above caps to try them out... but dont believe they are worth it...

its all in the fibre

[cjkpkg]

Yes, I have swapped input signals and speaker outputs. Switching the inputs has no effect and the "bad" signal follows when I switch speaker outputs.

I have ordered some new input and output caps from Mouser to give that a try.

[cjkpkg]

OK, I gave it the college try but I must say that the quality of the board is not very good. I have put together an aikido, custom psu, Tubelab SimpleSE, and made my own phono pre and I the only problem I had with pads coming loose was with the amp10. I ordered new input and output caps to try out tonight and the first try of desoldering one of the output caps resulted in the whole pad coming loose on the top surface.

All I can say is there was some potential with this kit and I ended on a sour note, very disappointed.

Carl

[Saturnus]

Though I have never made an amp10 I have mistreated several 41hz pcb's in the past without problems. It might be that you have one of the rare defective pcb's that will come from any maker. Hardly the fault of 41hz as Jan can't possibly test the pcb's themselves. Maybe you can get another pcb?