Next the sound IF stage, plus!

[ppppenguin]

I really wounld't worry about EB91 lighting up brightly at switch on. They rarely fail. Along with the EF80, when the human race is extinct, the cockroaches will do just fine with EF80 and EB91.

As for the 'phools, I've got a load of PC86 and PC88 here. (UHF TV tuner valves for those who aren't aware of them) Ideal for really pure high frequency response