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, 05:46 PM
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?
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
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.