[Amps] Terminology Question

[Bert Barry]

RMead100@aol.com wrote:
> 
> What is the origin of the B+ term in amp/radio/power supply terminology. I
> understand it to be the high voltage supply, but I do not know the origin of
> the designation and that has finally bothered me at age 52. It seems to me
> the only voltage referred to with this type of shorthand.........i.e. no A+
> or -; no B-, no C + or -.
 
Here's a chance to show my age!

Very early battery radios had separate batteries to light the filaments of the
tubes, to supply the plate voltage, and to provide fixed grid bias.  These
were known as the A, B, and C batteries respectively. The 'A' is no longer
used, as it would conflict with the European name Anode. But 'C' still shows
up in Ecc for DC grid voltage, etc.

Bert, VE3QAA