sck0006 writes:

We have a Hastings VT-4B made by Beede Electronic Instruments Co,
Inc. The line transformer in this unit has burned. It's a custom
transformer, made by Regional Mfg. Specialists, part number 528214-G.
From what I can tell, it just feeds into a bridge, center tap
grounded, which powers the LM78L12 & L79L12 regulators. Dimentions on
it are 1.635in x 1.325in x 1.325in. It has wire leads, no terminals,
and is mounted by two screws through the cores. Any suggestions for
replacement? Would a 12.6-0-12.6 transformer give enough headroom for
the regulators?

The electroncs draw very little power so it might be OK. 12.6 * 1.4 (peak) is
about 17.6 V, But, you need 1.4 V or so for the bridge, another 2? V for the
regulator, and something for ripple, so that's getting close to the required
12 VDC output, especially over the allowed line voltage range.

I'd probably go with 14 VRMS or so if there is a standard part you can fit
in there.

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