"U67"-ish microphone

[abbey road d enfer]

What is the bias voltage you have set for this circuit in volts? Is it -1.6V or higher

Bias votage is almost irrelevant. Wjat counts is anode current. For good noise performance, this type of circuit usualy idles at about 0.5mA.

 

[Екатерина]

Bias votage is almost irrelevant. Wjat counts is anode current. For good noise performance, this type of circuit usualy idles at about 0.5mA.

Is it true that the standby anode current is 0.5ma? Thank you very much for your help

 

[abbey road d enfer]

Is it true that the standby anode current is 0.5ma? Thank you very much for your help

It's typical of many tube mics, most Neumann's, Sony, Rode, all chinese stuff. A notable deviation is the Neumann U67, which runs at 0.9mA.

 

[Kaskelot]

Why use M7's with U67-ish electronics (which include high-frequency attenuation)? How dark / dull are you hoping (or intending) those mics to be?

Actually the result was the opposite with a knee at 2 kHz so it is lacking body. Must be a mismatch between tube, cap and transformer.

 

[micolas]

Actually the result was the opposite with a knee at 2 kHz so it is lacking body. Must be a mismatch between tube, cap and transformer.

The result looks strange.
?