Thread: AA battery hack secret
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Lew Hartswick Lew Hartswick is offline
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Default AA battery hack secret
clare at snyder.on.ca wrote:
On 24 Sep 2007 01:10:00 GMT, (DoN. Nichols)
wrote:

The "F" designation was for "F"ilament use. Lots of old batteries had
1.5 volt filaments in the rectifier tubes, so you had an "A", a "B"
and an "F" battery.


And "C" for bias voltage. I can remember a few that had them.
...lew...
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