Hi Phil - Happy New Year to you and the 'amps' reflectees
>I've managed to get my hands on an HV Transformer which features a
>3950-0-3950 secondary, and a 10-0-180-200-220-240 primary. The only ID on
>the unit is "M.E.P. M1921 SR/T 2468".
This sounds like one of the HV xfmrs used in 2 x 4-400A Marconi amps.
for Band II FM ? The 4-400As had about 5.5 - 6.0 kV on the anode
and their anodes glowed orange all the time !
>The question is: How do I tame the beast so as to provide the required
>level of DC from a 240v AC supply?
I'm sorry Phil - I think you will find that this xfmr, however attractive it
may seem and however much you paid for it, may be useless for your
HV PSU project. You can either (a) use the Variac on the primary
but you will need a 15-20A Variac otherwise the winding overheats
if you have it set to, say 60% of the input voltage OR (b) obtain
another similar HV xfmr and run the primaries in series and the
secondaries in parallel (this is easier than it sounds, just check
the correct phasing and put e.g. 10ohm WW resistor in each
secondary leg to help equalise the current distribution)
I've tried several 'tricks' over the years to use HV xfmrs which
give too much AC and there are always problems.
Don't bother with the G4FRX circuits - they work well but
are excessively complex.
73
Chris GM3WOJ
www.qsl.net/gm3woj/
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