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Re: Weird results DC operating point for Tube amplifier


 

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Le 18/02/2025 ¨¤ 20:13, John Woodgate a ¨¦crit?:

The heater voltage is 12.6 V or 6.3 V, not 6.0 V.

Preamp tubes are very often heated at reduced voltage, for noise optimization.
Particularly in condenser microphones, where secondary emission (grid current) is to be avoided at any cost. E seies (6.3V nominal) are often run at 5.5-5.8V.

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