[Amps] Gassy Tubes/Technology Museum looking for artifacts

[TexasRF at aol.com]

Wild guess: to prevent plugging a 6.3v filament tube in a 12.6v socket?  
Maybe 807's were also used in other applications in that era.
 
Remember the early 1625 "linear" amplifier designs requiring a hole to be  
cut in the base to separate the beam and cathode leads? We are (were) a  
resourceful bunch huh?
 
73,
Gerald K5GW
 
 
 
 
In a message dated 7/26/2007 9:22:48 A.M. Central Daylight Time,  
g3rzp at g3rzp.wanadoo.co.uk writes:

Does  anyone know why the 1625 got a different base to the 807? I read 
somewhere it  was developed for ARC for the Command transmitter, (just as the 12A6 
was  developed for the receiver) but there doesn't appear an inherent reason 
why  the base was changed.
73
Peter  G3RZP
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