16-09-2019, 10:29 AM
Voltages:
A = LT (not just 1.5V batteries)
B = HT (Not just HT batteries)
C = Grid Bias (always negative)
Also older USA schematics show the HT (B+) below the 0V rail on the page rather than at the top. Also often uses /\/\/\ rather than - - - - for grid and draws valves (tubes) on their side with cathode/filament to left and plate to the right.
UK Ever Ready used A and B prefixes for LT and HT packs, though AD probably was from "All Dry" as the first AD packs were combo LT and HT in 1939. The USA had All Dry radios (i.e. 1.4V rather than 2V filaments) from 1938.
The Anode was called a Plate in the UK too, once. Perhaps when the car carburettor air flow control was called a "Strangulator" rather than "Choke".
A = LT (not just 1.5V batteries)
B = HT (Not just HT batteries)
C = Grid Bias (always negative)
Also older USA schematics show the HT (B+) below the 0V rail on the page rather than at the top. Also often uses /\/\/\ rather than - - - - for grid and draws valves (tubes) on their side with cathode/filament to left and plate to the right.
UK Ever Ready used A and B prefixes for LT and HT packs, though AD probably was from "All Dry" as the first AD packs were combo LT and HT in 1939. The USA had All Dry radios (i.e. 1.4V rather than 2V filaments) from 1938.
The Anode was called a Plate in the UK too, once. Perhaps when the car carburettor air flow control was called a "Strangulator" rather than "Choke".
