How to safely install Push to Talk Johnson Viking 2 tube Ham Transmitter скачать в хорошем качестве

How to safely install Push to Talk Johnson Viking 2 tube Ham Transmitter

Another Johnson Viking II at D-Lab electronics bench. This one came in blowing fuses. Turned out to be tired power supply filter capacitors. Easy fix. The real hazard awaited discovery. Sometime in the past a PTT circuit was added to this transmitter. A good looking job, however very unsafe. The fellow utilized the low voltage DC line (approx 388vdc) to drive a relay coil. This practice was used back in the day, but not recommended by todays standards. I replaced that system with a safe 12vdc relay. Now the transmitter wont give you a jolt when handling your D-104 microphone. Remember when installing modifications to radios, make sure it is done correctly. If this radio made its way down the road and injured someone, it would not be a pretty scene.