Found in a 1949 Radio Electronics, this circuit employs a double tube with a 117V filament. This tube could be heated directly by the mains voltage.
Receiver with double tube (T1590E)
- Details
- Written by: Newton C. Braga
Found in a 1949 Radio Electronics, this circuit employs a double tube with a 117V filament. This tube could be heated directly by the mains voltage.
