Author Topic: Lister generator variable resistors.  (Read 210 times)

1956ld1

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Lister generator variable resistors.
« on: February 06, 2021, 02:31:09 PM »
Hi all, Been absent for a while I know but getting back on track now.
Having completed my startomatic box which I remade, I have a question. The wire-wound resistors found in most Brush type generator head, One small one and one larger on. On any set I've ever worked on have needed serious work and I'm running out of old spares to repair them with. I'm wondering is there a modern replacement for them or can I buy the wire to rewind them? I'm fortunate to have found a very damaged lister backup installation box (about 5 feet high) so I have a supply of relays but the resistors are the rare things now. Any help is appreciated
Josh.

mike90045

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Re: Lister generator variable resistors.
« Reply #1 on: February 07, 2021, 07:08:24 AM »
resistors are still made.  I don't know if you need an adjustable one, or a fixed value.
Try this into a search engine, use the OEM resistor to figure out the physical size - that would be the wattage required, and I hope you have some resistance values to start with:
Tubular adjustable Wirewound Resistor

BruceM

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Re: Lister generator variable resistors.
« Reply #2 on: February 08, 2021, 12:02:53 AM »
Digikey and Mouser do stock a wide range of power resistors, fixed and adjustable.  The both have decent parametric search.  You will need to know the desired resistance and watts.  You may be able to estimate wattage from the schematic and/or size of the stock resistor. Give a holler if you need help.

1956ld1

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Re: Lister generator variable resistors.
« Reply #3 on: February 08, 2021, 10:23:45 AM »
Thanks, ill give this a try

oldgoat

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Re: Lister generator variable resistors.
« Reply #4 on: February 11, 2021, 01:51:47 PM »
If the ceramic former is still intact you can rewind them to the correct resistance. My Aux field resistor was crook and the resistance of it was so low that I was able to rewind it with 0.9 mm stainless mig wire.