• 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.

CCS for 12B4 linestage

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12B4A+CCS

Try C4S.
 

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hey-Hey!!!,
With the BJT transistors, getting a mu output is not possible. Since regulated current will get split between cathode and output signal, it might be best to use a bypass capacitor on the cathode resistor. Of course, one could switch between plate output and mu output....I suspect that there will be one that works better given the rest of the system...:)
cheers,
Douglas
 
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