During May of 2022 the DC to DC converter failed which caused a DC spike.. The Hamtronics TA-51 220mHz exciter board final output transistor took the brunt of it. The back of the PC board was repeaired and the transistor was replaced.
The little board to the right was also replaced. It's a TIP42 transistor switch that sends 13 volts to the transmitter when the 220 receiver becomes active.
Bench testing the repaired transmitter. It is running two watts for one continuous hour with a consistant 349 milliamps of current. In other words, the new transistor should run warm, but not hot, in continuous duty.
