[ARC5] Heater voltage split in "command" receivers

[Roy Morgan]

On Jan 25, 2013, at 3:14 PM, Leslie Smith wrote:
> I think vacuum tube operation is less demanding than X-ray tube
> operation, but a 50% reduction in filament voltage IS significant.

My Novice command receiver (3-6 mc) had a power supply with 6.3 volts  
from the power transformer and another amount from a couple of AA-5  
audio output transformers serving filament duty.  These were wired to  
the line ahead of the power switch and ran all the time.  So, when I  
turned the set on, the thing came to life in a few seconds instead of  
15 or so from cold filaments.

Possibly the warmth in the tubes helped with warmup stability, too.

Roy


Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!