I removed the transformer from the case for testing and replacement of external wires. Hooked it to a variac set at 110v and started measuring with my Micronta fet VOM: 5.4v/3v/680v. I figure the two filament voltages are fine (meter error), but am wondering about the high voltage. Too high? Kind of hard reading the voltages off the on-line schematic. Measured the resistance across the HV leads at about 70k. There are a few crispy parts underneath the radio, and I'm hoping some sort of transformer related/HV "event" was not the cause. Any thoughts?
Thanks in advance.- jim
If the transformer doesn't get hot and has voltage it will be good. A transformer with shorted winding will overheat. If open you won't have voltage.
Voltage will read high without load and with todays higher line voltage. From voltage readings your transformer should be good. I would recheck that 70K resistance reading. It should be much less.
Norm
: Trying to decide whether or not to "go for it" and do a complete rebuild of a very dirty basket case Atwater Kent 944. I've concluded it is very do-able if the power transformer is OK. I've got some data and could use input from others.
: I removed the transformer from the case for testing and replacement of external wires. Hooked it to a variac set at 110v and started measuring with my Micronta fet VOM: 5.4v/3v/680v. I figure the two filament voltages are fine (meter error), but am wondering about the high voltage. Too high? Kind of hard reading the voltages off the on-line schematic. Measured the resistance across the HV leads at about 70k. There are a few crispy parts underneath the radio, and I'm hoping some sort of transformer related/HV "event" was not the cause. Any thoughts?
: Thanks in advance.- jim