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

[Michael]

-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of David Stinson
>>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.

A follow up question then ... 

What tubes from that era can be substituted with a little wiring
jiggery-pokery and maybe a heater dropping/bypass resistor or two?

Best Regards,
 
Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts  
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