Why is there no B size battery?

B battery (vacuum tubes)

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In electronics, a B battery is any battery used to provide the plate voltage of a vacuum tube. It is sometimes colloquially referred to as a "dry battery" (although there's no reason why a "wet" battery of suitable voltage couldn't be utilised for the purpose) The term comes from the days of valve (tube) radios when it was common practice to use a dry battery for the plate (Anode) voltage and a rechargeable lead/acid "wet" battery for the filament voltage.

Even when the plate voltage rail is fed by a power supply rather than a battery, it is generally referred to as the "B+" line.

http://en.wikipedia.org/wiki/B_battery_%28vacuum_t...

AND Check out

http://en.wikipedia.org/wiki/List_of_battery_sizes

I have never seen a size A battery, but I got this with a quick search.

"As far as a “B” size battery goes, I found that it was used in old (read “antique”) tube type radios and was a 67.5 volt dry cell. I found this info while reading the history of radio development. I found an article by a gentleman who purchased a couple of old tabletop radios to gut, and seeing that they were still in good condition, he set out to refurbish the units. He improvised the “B” cell using a combo of 9volt batteries along with a computer battery of 4.5 volts.

As far as an “A” cell goes, still haven’t figured out what happened to that designation, if there ever was one."

back in the days of tube electronics there

were A and B batteries,,,

the A battery supplied filement voltage for the tubes,.

The B battery supplied plate voltage.

since we don't use tube technology in a mobile

scenario anymore the batteries went by the wayside.

it must be 2 big