Mr Brown: "You could still use the 6П3С / 6R3S / 6P3C with cathode bias, just use half the cathode resistance value for a single section. Bypass, with a capacitor having twice the value for a single section, that should work, as long as the two sections operating chatracteristics are reasonably close to each other. "
There are darlings that are constructed this way. Never thought about that.
Wiesiek Lipowski: I do hate when Western people read the letters right off Russian tubes. I am so confused when people are talking about 6P3C when they mean a Russian style 6L6, etc.
However the 6R3S is an odd looking tube and the bonus of having TWO elements in one tube is fascinating, saves sockets!
azazello: But the Priboi uses some 420V?? Or that makes less than 250V on the plate??