[ARC5] Looking for BC-AL-430 Transmittter Info and Related Items

[David Stinson]

----- Original Message ----- 
From: "Chris Bowne" <aj1g at sbcglobal.net>

>Is there a "family lineage" progression    
> for the 4 pin 45 triode to octal and hopefully 
>a 7 volt local or a 12.6 v octal?

Not really.  The VT-52 "45-Special" (with 7.5 V fil) 
and VT-25 "10-Special" are products of early 1930s
tube design, which featured lower-emission direct-heated
filaments and high (400+) plate voltages.
Late-30s to early-40s tube design made a switch to 
high-emission indirectly-heated cathodes and lower (~250)
plate voltages.  There is no direct line from, say, a VT-25
to a 6-Volt octal.  Some later tubes can be made to 
do some jobs of the earlier ones, but not all.

73 Dave S.