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RE: CCS with Cathode Resistor in a long tail ?

Thx for the fast reply...two questions:

1. In the current setup it is a positive +15V supply. Ate you saying I need to change it to -15V ?

2. Why 15 ? Why not 12 or 20 ? From where does this number come from ? Note that a 6n6 generates at 8ma -7.5v Ug while a 6922 would generate -4.1V Ug with the same current and 300v. I prefer the 6922 over the 6n6, more life-like.

Thx a lot.

Frank

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