I don't think I will be doing SE anytime soon either.

I have considered the 845 for the next amp, but *EVERYBODY* seems to have gone and built some version of an 845. Now the 813 is comparable in the filament requirement...and I have never even seen one built into an audio amp, let alone heard one. There are a few old commercial audio amps built with the 813. I suppose my statement ought to aply to DIY stuff.

if it were easy, everybody sould be doing it.
regards,
Douglas

Merry Christmas everybody!