• 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 tubes/valves: PCBs

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Finally wired up mine 😀
 

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Question about HV PNP CCS

Hi all,

There is one thing I dont understand, maybe Planet 10 or anyone can enlighen me.
In the CCS-beta2.pdf, page 5, in the HV PNP CCS schematic, what is the purpose of D1?

For me, it looks like a dead short, and why is it optional? (dotted lines).
If used, should it replace R1?

I just dont get it.....:scratch:
 
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