|[AMRadio] Transformers Revised|
rickbras at airmail.net
Mon Feb 19 10:19:08 EST 2007
Thanks, Geoff. That may very well be the key to this problem. The
filament transformer I need is a 100 vac primary (or multi tap as you
suggested) with a 5 vac @ 2.5 amp secondary. This is out of a GE
BT-20-A broadcast transmitter and they used a small potted GE
transformer. I seems they were trying to insure you use their product
for replacement. There are five filament transformers and all have 100
vac primaries that are wired in parallel through a large rheostat. So,
to make sure the filament voltage on all tubes is correct you adjust the
rheostat to 100 vac as indicted on the filament voltage meter. I assume
they were insuring a perfect voltage match for even very low line
The plate transformer I need is a standard frame type with 115 vac
primary and 900-0-900 (1800 total) secondary. I am guesstimating the
current at around 300 ma. It's the low voltage supply for the modulator
Any help will sure be appreciated.
ARS W5OMR wrote:
> I've seen a lot of filament transformers that had 0 - 100 - 105 - 110
> taps on the primary, with one secondary. They're out there, Rick.
> What voltages do you need? I might have one.
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