[R-390] 12BH7A

[Renee K6FSB]

Hi Ron-
almost anything can be used to drop the voltage, the 12BH7 or equivalent 
filament current ( may require socket rewire/mod), a 43 ohm  10W( I 
think if memory serves),  a replacement circuit for  current limit or 
voltage control, replacement of the of the other 2 tubes in the string 
with their 12 volt equivalents and having a jumper in place of the 3TF7 
pins.
and if you are really lucky..... Kielbasas will also work.....
Renée,K6FSB
 

Ron.K3PID wrote:
> My R-390 has a 12BH7A in place of the 3TF7 Ballast tube. Is this a documented modification?
>
> Ron K3PID
>
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