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Old 1st July 2003, 06:10 AM   #1
jarthel is offline jarthel  Australia
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Default why is the plate supply called B+?

as title. Thank you.

Jayel
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Old 1st July 2003, 06:28 AM   #2
Colt45 is offline Colt45  Serbia
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in old radios you had 3 batteries.

A = filaments
B = plate supply
c = bias supply
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Old 1st July 2003, 07:39 AM   #3
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I think it was just the pos pole of the battery, "battery +".

Jan Didden
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Old 1st July 2003, 08:28 AM   #4
jarthel is offline jarthel  Australia
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thanks
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Old 1st July 2003, 08:56 AM   #5
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Yep, B just stuck around I guess. Alot of amps use fixed bias but I wonder why it isn't called C-. *shrug*

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Old 7th July 2003, 05:19 AM   #6
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Quote:
Originally posted by Sch3mat1c
Yep, B just stuck around I guess. Alot of amps use fixed bias but I wonder why it isn't called C-. *shrug*

Tim
C- is actually at the grid (bias)

Old triple DC battery nomenclature still prevails even in tubesets powered by an AC-DC power packs

A Battery
A- and A+ provide the filament voltage

B Battery
B- and B+ provide the plate volatge

C Battery
C- and C+ establish the grid bias voltage

Interestingly enough the cathode was connected to BOTH the C+ and B- terminals or those batteries yet functioned as totally independant circuits

HTH
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