[Milsurplus] Odd tubes - found

[Kenneth G. Gordon]

OK. It turns out that these "odd tubes", labeled 10E 7.5 - 36 VT-25/7312 with 
the weird bases, are special #10s, made especially for the RAF during WWII 
by Marconi-Osram-V(something).

The large 4-pin base is a special low-loss British RAF base.

The 7.5 indicates their filament voltage, and the 36 indicates their wattage 
capability.

They are good to 15 MHz.

Someone in Europe is offering a pair of them for sale for $500 Euros.

Thanks for the help, Folks

vy 73,

Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne