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Old 06-14-2009, 12:29 AM   #1
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Univolt TU-345A Humming

I think its the original and it seems to works good, but humms loud. I have a 1972 Trade Wind. I pulled it out because I'm redoing the bathroom, but don't want to reinstall it if its a concern. A local repair shop said humming is common, but the more opinions the better.
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Old 06-14-2009, 02:12 AM   #2
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I think its the original and it seems to works good, but humms loud. I have a 1972 Trade Wind. I pulled it out because I'm redoing the bathroom, but don't want to reinstall it if its a concern. A local repair shop said humming is common, but the more opinions the better.
The humming, is caused by loose laminations in the transformer, that's in the Univolt.

If you have plenty of time, you can repot the transformer, which will cure the hum.

If you want to know how to repot it, let me know.

Andy
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Old 06-14-2009, 05:02 AM   #3
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Yup...humming is common, so common in fact many people installed switches to turn them off at night Unless you are bent on a perfect restoration I would consider an upgrade to something like the Intelipower. Technology marches on and the Uni-volt is one piece of old technology I can do with out. The newer ones are solid state, quieter and are better for your batteries.

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Old 06-14-2009, 08:07 AM   #4
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They hum, and boil batteries dry, if your not careful and watch the water level in the battery. We opted for an upgrade to a modern charger/converter and found it worth the expense.
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Old 06-14-2009, 10:15 AM   #5
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Thanks Andy I would be curious about the repot. Please let me know.

Cody
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Old 06-14-2009, 10:19 AM   #6
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Aaron,
Thanks I'll look into the intelipower. I did by a new better battery so thats a concern as well.
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Old 06-14-2009, 12:48 PM   #7
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Cool

The truth of Its, I have been staying In my 73 a lot after the fire In the 91.. I have come to the conclusion I missss that buzzzing on my afternoon naps especial In a noise campgrounds!! In the 91 I always have music or a fan on for background noise all the time. In the 73 no need It has Its own (BUZZ)!!!!
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Old 06-14-2009, 02:38 PM   #8
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Mine hums, never trashed a battery since I went to sealed ones. I just shut down the GFI when we hit the hay.
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Old 06-14-2009, 04:38 PM   #9
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Thanks Andy I would be curious about the repot. Please let me know.

Cody
Cody.

Remove the transformer.

Soak it for a couple of days, and rotate it every few hours.

The liguid is simple varnish.

After acouple of days, remove the transformer and let it air dry for a couple of days.

Then reinstall it.

The hum will be gone.

And it's a lot cheaper than a new Univolt, regardless of brand.

Andy
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Old 06-16-2009, 11:02 AM   #10
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Andy THANKS I'll do that... Which one is the transformer? What should I soak it in?
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Old 06-16-2009, 12:01 PM   #11
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Andy THANKS I'll do that... Which one is the transformer? What should I soak it in?
Take the cover off the univilt.

You will see the transformer.

Write down which wire goes to whatever.

Check post #10 above for instructions as to how to do it.

VARNISH is the potting material.

Andy
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Old 06-29-2009, 02:45 PM   #12
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Andy,
I went to take the Univolt apart this weekend and noticed the cover was riveted together. Should I just drill them out?
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Old 06-29-2009, 03:08 PM   #13
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Andy,
I went to take the Univolt apart this weekend and noticed the cover was riveted together. Should I just drill them out?
Just drill them out and remove the cover.

There is nothing you can hurt by doing that.

Andy
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Old 06-29-2009, 03:45 PM   #14
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Sounds good and thanks again for the help. I'll do it and take a picture before I start pulling wires. I'll post the pics by the end of the day tomorrow.
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