[AMPS] Two EHT Transformers

[M.J.Willis]

I have just obtined a nice EHT transformer 1800-0-1800 V at 450ma DC. 50Hz. 
This will give via a full wave rectifier circuit 2.5kV. Not sure of the 
current but probably quite a bit, it weighs 20kg and has 130ohms secondary 
resistance through the entire winding, 65 ohms in each half. To work out 
the amateur power output is non-trivial, but I would hope it is around 2kVA 
for 50% duty.

I need 3.5kV - not 2.5kV. Is it sensible to add another transformer in 
series? Normally one grounds the centre tap, but I have seen the lower 
voltage versions of this transformer e.g. 900-0-900 1A used with a bridge 
to give 2.5kV, implying the centre tap can sit at half EHT. The transformer 
is vacuum impregnated with varnish.

Effectively, I want to series a 1kV PSU and a 2.5KV PSU - will it work 
without drama?

73 Mike


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