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Re: U64 - can anyone confirm this:
Author: Klaus Heyne
Date: 10/29/2007
AKG, which used the 7586 Nuvistor longer and in more mic models than Neumann (as if that's any badge of honor!) prescribes a heater voltage of 5.0VDC for most of its mics.

I have always used this voltage with good, long-term success and a minimum of heat buildup inside the mic. I suggest, you trim down the heater voltage to 5,0VDC and observe whether the ringing is affected.

I don't know anything about the esoteric and supposedly resonance-inducing interaction between certain components and a Nuvistor. I was under the impression that your Nuvistors only rang when agitated?

Microphonics certainly were a hallmark of the Nuvistor, and gave its reputation as a dud in microphone application a black eye from which it never recovered.  
 
Reply
Tim Dylla
10/26/2007
Klaus Heyne
10/28/2007
Tim Dylla
10/28/2007
Tim Dylla
10/29/2007
Klaus Heyne
10/29/2007
Tim Dylla
10/29/2007
Klaus Heyne
10/29/2007
Tim Dylla
10/29/2007
Martin Schneider/Neumann
11/06/2007