Original July 1938 issue of Service: A Monthly Digest of Radio and Allied Maintenance, Vol. 7, No. 7. Features articles on radio repair, tone-control circuits, sound systems, test equipment, and period radio receivers. Includes technical diagrams and a vintage RCA Beat Frequency Oscillator advertisement. A collectible piece of pre-WWII radio and electronics history.
Original July 1938 issue of Service: A Monthly Digest of Radio and Allied Maintenance, Vol. 7, No. 7. Features articles on radio repair, tone-control circuits, sound systems, test equipment, and period radio receivers. Includes technical diagrams and a vintage RCA Beat Frequency Oscillator advertisement. A collectible piece of pre-WWII radio and electronics history.
