Philco 118 - Power Transformer Shorted? - Printable Version

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+--- Thread: Philco 118 - Power Transformer Shorted? (/showthread.php?tid=17273)

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Philco 118 - Power Transformer Shorted? - radiodale - 09-15-2017

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?

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RE: Philco 118 - Power Transformer Shorted? - Mondial - 09-15-2017

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?

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RE: Philco 118 - Power Transformer Shorted? - robsradioactive - 09-15-2017

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

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RE: Philco 118 - Power Transformer Shorted? - radiodale - 09-15-2017

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.

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RE: Philco 118 - Power Transformer Shorted? - robsradioactive - 09-17-2017

Bad short somewhere.

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