Primary is the only way to go :)
73, Tony W4ZT
w2cqm@juno.com wrote:
> Due to a high 250VAC primary voltage, the dedicated filament voltage
> transformer (15VCT @ 22 amps) for a series wired retrofitted pair of
> 3cx1200A7's in a Henry 3KA is about 1 volt too high. The 220VAC Variac
> I have is a bit too cumbersome to locate into the lower section of the
> amp. A small footprint rheostat (22 ohms @ 50W) appears to be the way
> to go. Is it preferrable to wire it into one leg of the 220VAC primary
> or to wire it into the low voltage output side of the transformer? Any
> comments would certainly save me a great deal of trial and error. Thanks,
> Ron W2CQM/3
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