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Old Tranny Potting Material
Old Tranny Potting Material
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Old 7th June 2004, 01:21 PM   #1
audiopro is offline audiopro  Canada
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Default Old Tranny Potting Material

I need to remove a transformer from it's cover. The tranny is held in with a black potting material. Does anybody know what this stuff is.
The transformer in question is the power tranny from a Heathkit W-4M amplifier. Pretty old.
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Old 7th June 2004, 02:07 PM   #2
Eli Duttman is offline Eli Duttman  United States
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Somebody with exact knowledge will have to speak up, but what you describe seems to be the stuff I know was used in the H/K Cit. 2 trafos. The Cit 2. trafos are potted in mixture of tar and ground slate.
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Old 8th June 2004, 12:15 AM   #3
serengetiplains is offline serengetiplains  Canada
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... tar and ground slate ...
Probably just the answer you were looking for? Nothing like a little tar to make one's day!

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Old 8th June 2004, 12:35 AM   #4
SY is offline SY  United States
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Old Tranny Potting Material
With heat, a lot of cursing, and mess, you can get the transformer out of the goop. But don't use any open flame and watch the temperature. A kitchen oven (if you and anyone you share it with are tolerant) works very well. Try starting at 250F, then increment upward in 25 degree steps until you get the material to melt. Allow LOTS of time for the entire tranny to heat up- there's a pile of heat capacity in iron and copper!- and LOTS of time to cool down before touching it with bare hands.
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Old 8th June 2004, 04:02 AM   #5
audiopro is offline audiopro  Canada
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Thanks guys,
I know this is going to be a gooey mess. I was planning on using an old BBQ one last time to heat this up. That way it won't stink up the house. I'm not worried about the enclosure I'm getting them painted anyway. Just was worried about the fumes.

Thanks
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Old 8th June 2004, 04:20 AM   #6
Eli Duttman is offline Eli Duttman  United States
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Just was worried about the fumes.
A charcoal respirator might be a good idea. Keep a fire extinguisher handy; just in case things go wrong.

Good luck.
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Old 8th June 2004, 10:27 AM   #7
audiopro is offline audiopro  Canada
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Good idea, the extinguisher I've got, the filter mask I'll pick up.

Thanks
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