05-14-2012, 03:55 PM
Here's what I would do:
1. Go ahead and get an inexpensive replacement output transformer, 5 to 7000 ohm primary; 4 or 8 ohms secondary, won't make a penny's worth of difference. 5 watts is plenty. You're going to need one no matter what else.
2. If you have recapped the set and are ready to test, hook up the "new" transformer and bring the set up slowly.
3. When the output stage starts drawing current through the field, it should magnetize. Now measure the voltage before and after field, see if it's within range. Monitor voltage after field coil as you bring it up. If there are shorted turns, the field will become hot soon, not a danger to anything but the field itself, unless there is a short to the frame. Voltage after the field would be low because of lost power. Run long enough the field short would eventually turn into an open. That being said, actual vs published values on such things are not always accurate, an subject to change, so we try it, No?
4. Then assess the situation. An original working replacement may take some time to find, and probably won't come cheap. Reversable work arounds include using a P.M. Speaker, a choke, or larger filter capacitors and power resistor in lieu of choke. Been done so many times, don't want to repeat here.
Gotta be more opinions out there.
1. Go ahead and get an inexpensive replacement output transformer, 5 to 7000 ohm primary; 4 or 8 ohms secondary, won't make a penny's worth of difference. 5 watts is plenty. You're going to need one no matter what else.
2. If you have recapped the set and are ready to test, hook up the "new" transformer and bring the set up slowly.
3. When the output stage starts drawing current through the field, it should magnetize. Now measure the voltage before and after field, see if it's within range. Monitor voltage after field coil as you bring it up. If there are shorted turns, the field will become hot soon, not a danger to anything but the field itself, unless there is a short to the frame. Voltage after the field would be low because of lost power. Run long enough the field short would eventually turn into an open. That being said, actual vs published values on such things are not always accurate, an subject to change, so we try it, No?
4. Then assess the situation. An original working replacement may take some time to find, and probably won't come cheap. Reversable work arounds include using a P.M. Speaker, a choke, or larger filter capacitors and power resistor in lieu of choke. Been done so many times, don't want to repeat here.
Gotta be more opinions out there.
