Neumann/Gefell N61V sounds like waterfall

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TillM

Well-known member
Joined
May 21, 2016
Messages
683
Location
Berlin - Germany
Hi guys,
I’ve a N61V PSU on my table and I can’t find the fault.
The UM57 sounds like a waterfall, when I use this PSU.
A friend of mine has also the UM57 and I tested the mic with his PSU (aftermarket) and its definitely not the mic.
I changed the 1uf cap and 20uf capacitor on the transistor psu.
The other capacitors show the right values.
I also get a NOS rectifier tube.
Still the same problem.
Has anybody an idea what I could change?

Best regards
Till
 
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