09-15-2017, 05:46 PM
This set fails the dim bulb test with the rectifier tube removed. Transformer primary measures 2.3 Ohms. I assume the transformer is shorted, correct?
Philco 118 - Power Transformer Shorted?
09-15-2017, 05:46 PM
This set fails the dim bulb test with the rectifier tube removed. Transformer primary measures 2.3 Ohms. I assume the transformer is shorted, correct?
09-15-2017, 08:40 PM
Possibly but not necessarily. Did you remove all the other tubes also? There are lot of them and all the filaments combined will put a significant load on the transformer.
What wattage bulb are you using? The power transformer is pretty large and can draw appreciable line current. Do you have a Variac where you can bring the voltage up slowly and see when the AC line current starts to increase?
09-15-2017, 08:41 PM
Unless it is a short in the wiring to the transformer or between its secondary and the rectifier, I would say yes.
Yes it does matter what wattage you are using for a lamp. I assume you know what to use for the lamp. Rob
09-15-2017, 09:35 PM
It's a 100W bulb and lights brilliant immediately. I measured several of my large transformers and they all measure at least 5 Ohms. Owner reports "smoke and burning electronics" at last turn on. I called him after I posted this thread.
09-17-2017, 05:30 PM
Bad short somewhere.
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