PY 81 as power rectifiers?

[Kalee20]

There's no valve as the PCL80, do you mean ECL80? (It does actually draw 300mA heater current so justifiably could be labelled PCL80, but the 'voltage' letter seems to dominate in the numbering system).

If so, it's inconvenient to bias it, with its common cathode. A somewhat awkward valve!

Any chance of a sketched circuit diagram? Would help lots!

Congratulations so far BTW!