On Sat, 16 Aug 2003 04:35:44 -0700 Watson A.Name - 'Watt Sun'
wrote:

In article 5wg%a.152046$o%2.65030@sccrnsc02,
mentioned...

Well, Dynaco tube amps used batteries as a reference in theiur biasing.
http://www.angelfire.com/ma2/AdamVon/dynaresto.html

Well, so did radar sets, they used the old Burgess batteries as 'C'
batteries.

I dont' think the Dynaco reference was made quite clear enough for
you. There was no battery in the device; the just told you to adjust
the tube bias until the voltage drop across the precision cathode
resistor was equal to that across a fresh carbon-zinc cell.

Thus it was actually used as a reference to remove the uncertainty in
the calibration of the voltmeter that the average kit builder might
have in those days.

I've never seen one, but grid bias cells are often mentioned in the
antique radio newsgroup. They must have been common at one time, maybe
the 30s and 40s.

-
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Jim Adney
Madison, WI 53711 USA
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