[BC] 12 phase

[Dave Dunsmoor]

> >>The Bauer of the day with its 12 Phase
> >>Power supply had overated its power and modulation transformers and
would
> >>usually get well over 100%.
>
> >Must have had a "Zig-zag" plate transformer, then
>
> -- the Marconi BD272C 250KW HF broadcast transmitter had 12 phases; each
> phase fed an AR64 ignitron rectifier (mercury pool dippers). Simply done
by
> taps at appropriate points on the HT transformer. Gives very low ripple
and
> doubles the ripple frequency, so the HT smoothing components can be
lighter
> and less bulky.
> - Clive


Ok, I gotta ask. where did the other 9 phases come from?

Dave Dunsmoor