[MrFixr55]

Hii Bob,

Definitely check the headphone jack. The Tridyne is a reflex set, where the 1st RF amp is also the 1st AF amp. With the headphone plug in the jack, the switch is open and the Phones are in series with the RF Output coil primary. With the plug unplugged, the switch puts the primary of the 2nd AF transformer in series with the RF transformer primary, thereby connecting the RF / 1st AF to the 2nd AF.

If course, if the primary or secondary of the 2nd AF transformer are bad, the 2nd AF will be dead.