Twin Diode
Various Name Brands
The 6H6GT Vacuum tube was used in
many radios including
but not exclusively:
Collins: 75A-1
Hallicrafters: DD-1,
Hallicrafters: S-20R, S-21, S-27, S-36, S-37, S-40,
S-62, S-85, S-108
Hallicrafters: SX-9, SX-24, SX-25, SX-28, SX28A, SX-42,
SX-43, SX-62, SX-71, SX-99, SX-110
Marconi: CSR5A
National: HRO-7, HRO-50, HRO-60
National: NC-45, NC-46, NC-57, NC-125, NC-173, NC-183
RCA: AR-77, AR-88, CR-88, CR-91
6H6GT / VT-90A Vacuum tubes are a glass type used as
detectors, low-voltage rectifiers, and AVC tubes. Except
for the common heater, the two diode units are
independent of each other. They require an octal socket.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Preferred Substitutes .......... VT-90