Here is a possibility.....for some large iron
Configure the tranny as step down, then short out the secondary with a wire. Next hook up 120V from a wall outlet, and go through a incandescent lamp to the primary. Since the secondary is shorted, the primary will also be low impedance, depending on the degree of coupling primary to secondary. So start with a 50 watt lamp, and work up to 100 watts for a larger transformer. Both primary and secondary windings will be passing current (based upon turns ratio), and the current will vary with the wattage of the lamp. Since the wire will dissipate heat from current flowing through it, the tranny will heat from within. The trick is to not overdue it.
Other options apply, like a getting a tan in the July Texas sun..
Jim
Wd5JKO
If you know the wattage and the secondary impedance, you can figure from that the current and avoid overdoing it.
P = I^2 * R
P / R = I^2
For example 500W and a 5000 Ohm secondary
500 / 5000 = 0.1
sqrt 0.1 = 0.316 amp
There is a collection of old wives tales on this:
1.) The current can be checked with a resistor like 1 Ohm placed across the secondary.
2.) It should not be necessary to rush it or go overboard. Less is good as long as it warms it up.
3.) You can add a variac in case you don't have a lamp that give a close enough reading without being too much.
4.) If it ends up taking more than a 120V across the primary or any high power winding to make enough current flow. In that case step it up with a power transformer.
5.) Never use a low power feedback, monitor, or screen winding for this.
6.) Try to use the entire primary and entire secondary.
I don't know how fast it works by the electric method but I heated a 960W Collins one for a week just to make sure, and same with the matching modulation choke using a DC supply. I prefer the oven for a day at 150 degrees but if I damage the baking rack or any tar runs out and stinks it up there will be no pie for me. ever again. 8-)
