• 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.

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sure, here it is...


  • schema.JPG
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First stage is 0,73V = 1,5mA
Second stage is 0,8V = 1mA
Follower is 140V = 6.5-7mA

Pretty much corresponds to simulations and tube tolerances. However voltages are a bit off that whats in schematic, due to resistor tolerances in regulator I am having +310V PSU and so first stage is around 306V

Btw I noticed a bit lowered low frequencies when used with low output impedances. Right now I have 1uF and its ok for 47k load, however with 10k load it has like -3dB on 20Hz which is not good, so its better to use bigger output cap to be more versatile, I am going to change mine to 6u or so...