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MP566 Tube microphone preamplifier / Re: Noise when switching form MID to HIGH gain

« on: January 17, 2022, 04:05:59 PM »

Check the direction of capacitor C5 and the solder joints on R15.

Thanks for your reply!
On both units, C5 direction and solder joints on R15 appears to be ok.
It's strange I have the same problem with both units, could it be the API lunchbox?
 
Roberto

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MP566 Tube microphone preamplifier / Noise when switching form MID to HIGH gain

« on: December 28, 2021, 11:59:57 AM »

Hello!

As a long time user of SoundSkulptor products, I just added to my collection two nice MP 5.66 and I just finished to assembly.
They both sounds good so far, I have only a loud click noise when changing from MID to HIGH gain settings on both units.
They're both inside an 8 units API lunchbox, with separate power supply.
Other than that it seems all good. Any suggestions on what it could be?

Thanks!!
Roberto