20-06-2020, 08:34 PM
Oh, and the battery plug on the 5214, used from 1939 to 1962 approximately, for 1.5 & 90V nominal combo balanced batteries?
It's the B4 valve connections. With LT were the heaters/filament would be and the +90V where the Anode would be, the pin spaced off.
Obviously the top cap is needed with the B4 either with indirectly heated triode or the battery SG (Tetrode) valve. Some early Pentodes added a screw terminal at the side. Then they added the middle pin for B5. Some 1928/1929 battery Pentodes come in both versions.
It's the B4 valve connections. With LT were the heaters/filament would be and the +90V where the Anode would be, the pin spaced off.
Obviously the top cap is needed with the B4 either with indirectly heated triode or the battery SG (Tetrode) valve. Some early Pentodes added a screw terminal at the side. Then they added the middle pin for B5. Some 1928/1929 battery Pentodes come in both versions.
