PY 81 as power rectifiers?

[Amie]

Thanks guys.

I will try your ideas on the coupling capacitors, the 470uF was at hand but it seems the trouble was because of the cathode resistors, I will try some different decoupling and possibly a grid stopper for the triode too, it may help. Also if I get the grid biased spot on it may help.

Is there any reason a preset pot couldn't be used to set the bias empherically (sounds better than experimentally)

Thanks,
Amie.