25 Hz question

[dtvmcdonald]

I bought an old Atwater Kent Model 44F receiver, supposedly very rare.
That seemed odd ... until I found out that "F" means 25 Hz.
I also bought another 44 of unknown suffix. That likely means 60 Hz.
The seller has not shipped yet, though (from Ontario).

These things need power supply recapping. Its a strange, by
modern standards, supply: transformer, type 80 full wave
rectifier, then three paper caps at roughly 1 uF around two
filter chokes, unknown values.

Its going to be interesting to see what the inductor and
capacitor values are! I just hope at least some capacitors are
still original value. They probably should be, since they
are safe from water under all that tar. I intend to restore
so it will still work at 25 Hz.

This should be interesting. I have a Variac ... if I can find it ...
that should be capable of working at 25 Hz since its rated at
30 amps at 60 Hz. Would a regular 7 amp Variac work? I
intend this to step UP the output at 25Hz from my Phase Linear
400 amplifier to power the radio.

Doug McDonald