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Re: [Amps] Henry 3KA Plate Transformer Query

Subject: Re: [Amps] Henry 3KA Plate Transformer Query
Date: Mon, 2 Dec 2013 08:33:10 -0500 (EST)
List-post: <">>
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.
Gerald K5GW
In a message dated 12/1/2013 7:26:06 P.M. Central Standard Time, 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 
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 
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