WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
hey-Hey!!!,
First one I think of is the EF86. There will be others of course, but the TDSL search f'n can locate EF86 alternatives I think.
cheers,
Douglas