|[AMRadio] Filament voltage monitoring|
jpl15 at panix.com
Tue Feb 20 10:34:57 EST 2007
On Tue, 20 Feb 2007, Rick Brashear wrote:
> I sure do appreciate your advice and insight. I agree completely about the
> monitoring of the secondary instead of the primary filament voltage. I have
> no idea what GE was thinking other than to save a buck or two by using one
> volt meter to set the filament on all the tubes instead of individual ones.
The RCA BTA-1MX (And I would assume the others in the -1 series??) have
a 220VAC meter marked "FILAMENT VOLTAGE" and it does read the 833 filament
transformer primary, after the filament rheostat. If it weren't for the
re-wiring required, I'd be tempted to find a 0-15VAC meter with the same
cosmetics and replace it.
The other "gripe" I have about the -1MX metering is that the multimeter
is small (3") and scaled 0-150% - which of course makes for a cheap meter
- but the Operator now has no direct readout of the 15 or so different
voltages it monitors...
Oooohhhhh.... pooor babeeee..... ;}
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