[R-390] Was variacs, now bucking transformers...

[David Wise]

> -----Original Message-----
> From: Drew Papanek [mailto:drewmaster813@hotmail.com]
> Sent: Wednesday, July 23, 2003 2:11 PM
> Subject: [R-390] Was variacs, now bucking transformers...
>=20
> The constant voltage transformer regulates its output voltage=20
> by way of=20
> resonance raising the magnetic flux peaks high enough to clip=20
> the sinewave=20

The output waveform is not a sine wave; it's closer to
square.  This means that unless it's true-rms, your
voltmeter is lying to you.  In any case, there's
no right voltage.  The radio was designed assuming
a crest factor of sqrt(2).  The filaments respond to
rms, but B+ responds to peak.

Apropos of nothing: The circa-1960 IBM mainframe
in my basement contains two CV transformers.

73,
Dave Wise