• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tubes in an opamp feedback loop?

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jfetter

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Joined 2012
Well the cryo is definitely magic for vocals, maybe its suited for mics.
 

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J

jfetter

Member
Joined 2012
stocktrader200 said:
irfp240, irf240 outputs require NFB or 2A bias to eliminate crossover distortion. amplify the triode section with an NFB SS amp configured for unity gain.
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Either discrete or opamp circuit the -3 to -.5 bias voltage does not cross zero.
The discrete tube/ss unity buffer is always in class A mode.
We cannot see inside the opamps but if always operating minus V then the opamp is probably operating in class B totem output.
 
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