[Boatanchors] Paralleling HV Transformers

[wabate]

  You can parallel two identical transformers, but they must be 
identical or they will not share the load equally.  Just make sure the 
secondaries are in phase before you parallel them or you will have a 
direct short!  (Just in case you did not know.)  A voltmeter will tell 
you this.  If they are not identical you will get a circulating current 
which will heat the secondary winding.  The only precaution in 
paralleling primaries is that it effects the secondary phase so be sure 
to mark them both when you have it set up correctly.

73,

Bill, K3PGB

Byron Tatum wrote:
> Hello-
>     If I could bother someone for an answer here :
>         I have two identical HV transformers, each one does a great job at around 1900 Volts at 400 mA. (in choke input with 10 mFD.) powering a single tube (4CX400A) amplifier. I am getting ready to start using some dual tube amps (4CX400A) and was considering paralleling two of the transformers, as two of these guys are still more compact than other older style transformers that would fill the bill.
>     Are there any special precautions in paralleling the primaries / secondaries ?
>                                                         Thanks, WA5THJ