Originally Posted by liammanthis
I noticed that 2 capacitors on the PSU board, "SAMXON 470uf/25v" green and black one w the the same values are convex a little bit. Is there a difference between green and black one since they have the same values printed? Any replacement recommended maybe with higher quality? Can I replace it with "EKM Roederstein 470µF/25V Audio Gold ROE 9805" or with "470UF/25V PANASONIC FC"????
I'm not an electrician so if I'm not bothering you, please help me figuring it all out.
To answer your question....the black ones are GT series and the green ones are GF series.
Both are low impedance, high ripple current, 105degree.
The difference is the GT is longer life and high frequency use. So A&H probably used the different parts for a reason in the circuit and the GT is in a location that requires better high frequency filtering or specs....that's just a guess though as there is no schematic to look at.
I believe the Panasonic FC would work for either though.
The specs of the caps you get should be equivalent or better.
Voltage can be one level (35V over 25V) above the rated but never below (no 16V).
Now....are you sure that is the problem?
You really should have a tech who is familiar with mixers and audio equipment test and check it first.
Any good tech should have no problem finding the problem.
If you are attempting to do this yourself, I would check the PSU with a volt meter and scope first and verify the PSU is not producing the correct voltages to the mixer. Unfortunately you don't have a service manual or schematic so that will be hard to do without some technical knowledge.
At this point you really have no idea what has failed.
If you actually determine it is the PSU, you can get a replacement PSU board from A&H.
It's not automatically the caps in the PSU either....there may be other things like regulators that have failed. It could be anything. You can't assume much from your description or reports on a forum.
If you want to take a chance and replace the caps that's your choice and you might get lucky, but don't be surprised if something else doesn't work or you create more smoke and damage!