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R/E/P => Klaus Heyne's Mic Lab => Topic started by: RuudNL on May 20, 2018, 07:11:51 AM

Title: Neumann U77 supply voltage for FET
Post by: RuudNL on May 20, 2018, 07:11:51 AM

I would like to know (just to check) what the supply voltage for the FET stage in a Neumann U77 should be.
More specific: the voltage over C109.
This voltage is generated by the DC/DC converter.
Any thoughts?

Title: Re: Neumann U77 supply voltage for FET
Post by: uwe ret on May 21, 2018, 03:12:35 PM

Expect around 13 to 15 V across C109.