I used a rotary single-to-3-phase converter for 12 years.
(It is not really a 3 phase converter, as the original
phase is re-used - and only to phases are added) to power
a 2 x GU84B (4X1500B) amplifier. Yes, the other voltages
were all over the place but the filament voltage was
pretty steady at 31 volts AC. (The spec for the Russian
tubes calls for 28 V AC). After 12 years (when I got a
real 3 phase supply), I could not detect any deterioration
in the tubes. So I would not worry about it too much, as
long as the tubes are not under-heated. Overheating is
OK, probably up to about 10% over the filament voltage
specs.
GW
On Sun, 2 Apr 2017 21:56:06 -0400
Ron Youvan <ka4inm@gmail.com> wrote:
Steve NR4M Bookout wrote:
/* snip */
But, another thing to consider. I was looking a the
schematic and saw
where some of the smaller transformers were fed from one
phase, while
the HV was fed by two phases. Again, from what I read,
the voltages of
the 3 phases created from a rotary converter, vary
according to the
load. My concern is with the filament supply. If it's
off one leg, and
I was to vary the 240 input to get exactly what I need
for the filament,
what happens when I start drawing power and that leg now
changes by 10
%, or so.
Other choice is to just build a new 240 volt single
phase supply for all
the required voltages. It's just that the 3 phase
supply is part of a
really clean 'system' and it would be nice to keep it
original, if
possible. This seems like it would be the most stable
and reliable.
Thoughts?
It looks like it is not actually a three phase device
and it most probably can be run on `210 Volta (or so)
possibly with the aid of a
buck boost transformer or two.
I would look into the current consumption of the smaller
transformers to see if they can be paired up to run in
series.
I would also look for primary taps on the smaller
transformers, if so
perhaps pairs could be run on 240 Volts. My thoughts.
--
Ron KA4INM - Youvan's corollary:
Every action results in unwanted side
effects.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|