Ron, you can disconnect the transformer wiring and then apply 120vac to the
secondary winding. The primary taps can then be explored with relative
safety to determine the turns ratio of the various tap combinations.
Knowing the turns ratio you can easily predetermine the secondary voltage
derived with the primary taps.
73,
Gerald K5GW
In a message dated 12/1/2013 7:26:06 P.M. Central Standard Time,
w2cqm@juno.com writes:
Perhaps an owner of a classic Henry 3KA can help with determining the pin
outs for the four (4) primary 220AC input terminals on the plate
transformer? My transformer has four vertically positioned inputs marked 1-4
with 1
at the top position. Top position 1 is wired along with two individual
wires to position 3 and 4. I assume that is the CW (#3) and SSB (#4)
terminals. Position 2 is not wired and the schematic does not acknowledge
even
the existence of that terminal. Does anyone know for certain if wires 3 and
4 were repositioned to terminals 2 and 3, would I get a somewhat lower
secondary output voltages? For clarification, I have removed all the
parts related to the choke input aspect of the power supply and replaced
those components with a self contained full wave diode,filter,and bleeder PC
board measuring only 6x9" and capable of handling 5400vdc @2 amps.
Currently in the SSB position, the secondary voltage output will certainly be
too high for my 887
7 retrofit tube needs. In the CW mode, the AC voltage output is 3KV and
fine for 4200VDC rectified. Regrettably, I would have to block out the
SSB position. However, I would prefer to move the voltages down "a notch"
but not certain if that could be accomplished by using pin 2 and 3 thereby
keeping the very convenient two tier plate voltage. If anyone is familiar
with the Henry transformer, perhaps they could share that information
with me? It would save me muddling through some intimidating exploratory
rewiring changes with the Variac that I would be uncomfortable undertaking
for fear of damage. Any assistance would be appreciated. Thanks, Ron
W2CQM/3
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