1

MP512 Microphone preamplifier / Noisy signal without low-end

« on: May 24, 2023, 09:59:31 AM »

Hey,

I build a MP512 one year ago and it worked fine. I didn't use it much, and when I used it now I realized, that there's something wrong.
It has a realtively high noise level nad pretty much no low-end. The signal sounds filtered.
Anyone an idea how that could have happened?

Thanks, Malte

2

MP573 Microphone preamplifier / Input gain problem

« on: March 08, 2021, 07:27:33 PM »

Hey,

I just finished building the MP573 and all the testing went well.
When I came to the part of pluging the mix there is one problem:

I only get signal when the gain knob is on 10 or 20 dB. For all the other settings there's nothing.
Alls the other switches work though.
I checked all the solder joints of the rotary switch and reworked some, but still have the same problem.

Any idea what it could be?

Thanks, Malte