"TOM WALKER" bravely wrote to "ROY J. TELLASON" (15 Jun
05  09:55:00)
 --- on the heady topic of "Charger"

 RJT>There must've been an "A" cell at some point,  or the
system wouldn't make
 RJT>sense...

 TW> One would think so. And it would have been a size inbetween the
"AA"
 TW> and the "C" for the system to be consistant. BUT I so far
have found
 TW> NO trace of it.
 TW> WHICH brings up another question. WHAT ever happened to the "B"
 TW> Battery? :-) :-)


Well, the "A" battery was used for tube radio filaments in the old
days these were likely 1.5 volts but then went on to become 6 volts.
The "A" battery changed with the trend. Here is an excerpt from the
Old Time Radio FAQ which mentions tube biasing in old radios:

/
Q.  I have a Philco battery-powered radio.  It has a four-prong plug
 for the battery.  Can I get a converter at Radio Shack and use it to
 make my radio work?

 A. No.  The battery radios required 1.5 volts for the tube filaments
 and 67-1/2 or 90 volts for "B" (plate) voltage.  The 3-way portables
 (AC-DC-battery) had built-in battery eliminators, and the tube
 filaments were generally wired in series, requiring a 6 or 9 volt
 "A" battery. You'll need to make a supply that can deliver 1.5 volts
 at about 400 ma. and 90 volts at about 50 ma. for your four-prong
 Philco.  Both have to be good clean filtered DC.  The
 power-pak-in-the-plug type power units sold by Radio Shack and
 others are made to deliver 6-9 volts at 100-200 ma. unfiltered DC.
/

Hope this helps,
 M*i*k*e

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