This 1969 circuit uses a triode and two batteries, one for the filament and the other for high voltage. C4 and C5 are 50 pF, 5k6 R1, 750 ohm R2, 1k1 R3 and 15k R4. C1 and C2 are 2n2.
This 1969 circuit uses a triode and two batteries, one for the filament and the other for high voltage. C4 and C5 are 50 pF, 5k6 R1, 750 ohm R2, 1k1 R3 and 15k R4. C1 and C2 are 2n2.
