[Amps] backwards plate transformer

[Chuck Curran]

I have used pole transformers since 1968, running them backwards so to speak
as you have decided to do.  As long as you follow the proper voltage and
current of the original transformer design, you will have no trouble and an
excellent, very heavy duty power supply.  I am making a major leap of faith,
I am assuming this is possibly a pole transformer?

Around my area, the transformers like you have were being taken out of
service in the mid 1960's, providing many $10.00 plate transformers if you
knew the guy from the power company!  The one I bought I remember as being
2250 VAC primary to 120 VAC/240 VAC secondary.

I now use a 5 Kw transformer that was original a dual primary, with 7200 VAC
for the dual primaries each.  Normal primary voltage was 14,400 VAC in our
area of Wisconsin.  The secondary was set up for 120 VAC/240 VAC.  I pulled
that puppy out of its can (PCP free) and let it drain for a month or so.  I
then measured the wire size and found I could easily run it at 1.5 Kw
output.  So, next I unwound the high voltage windings, layer by layer now
re-labeled as the secondary, until I got it down to about 2050 VAC output.
I hooked them in parallel.  With a boost/buck in the primary, I can get 2600
VDC to 3400 VDC from my current HV supply

I use it with a pair of 3-400Z tubes with 1200 watts out, so it never even
gets warm.

Go for it, you seem to have found a great transformer!!  If you want further
detail, let me know.

Chuck W9POU



-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Martin Flynn
Sent: Sunday, May 30, 2010 1:58 PM
To: AMPS List
Subject: [Amps] backwards plate transformer

I picked up a used 5 KVA GE transformer.   2400V primary, 120/240V 
secondary.    With 208 on the secondary (I am running it backwards)  I 
am measuring  2500 unloaded on the primary.  

Anyone using a backwards transformer for plate & are there other issues 
I should be on the lookout for?
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