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Re-varnished Ballast
In my recent haul, there were included 3 GE NEMA fixtures with ballasts. One of those has a damaged ballast (broken winding) which I may attempt to fix later on. Meanwhile, the other 2 I cleaned up and let them run until hot, then applied class H transformer varnish. At first, they ran rather loudly but afterwards, there is absolutely no audible hum or vibration at all.

Repaired ballasts are dated CG and MG (3-71 and 12-71).
Keywords: Gear

Re-varnished Ballast

In my recent haul, there were included 3 GE NEMA fixtures with ballasts. One of those has a damaged ballast (broken winding) which I may attempt to fix later on. Meanwhile, the other 2 I cleaned up and let them run until hot, then applied class H transformer varnish. At first, they ran rather loudly but afterwards, there is absolutely no audible hum or vibration at all.

Repaired ballasts are dated CG and MG (3-71 and 12-71).

004_1~0.JPG 001_1.JPG 005_1.JPG 008_1.JPG 004_1.JPG
File information
Filename:005_1.JPG
Album name:don / HID
Keywords:Gear
Filesize:204 KiB
Date added:Nov 09, 2014
Dimensions:1200 x 900 pixels
Displayed:246 times
Color Space:sRGB
DateTime Original:2014:11:09 15:47:21
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Exposure Time:1/50 sec
FNumber:f/2.7
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Focal length:6.2 mm
Make:Canon
Model:Canon PowerShot S2 IS
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=18680
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Comment 1 to 5 of 5
Page: 1

gmercury2000   [Nov 10, 2014 at 06:22 PM]
Where did you get the varnish?
Mercuryvapor123   [Nov 10, 2014 at 07:36 PM]
I would love to have some for my 1969 M-250 that bad boy roars like a lion. I also have a M-1000 ballast that could use some re- varnishing.
streetlight98   [Nov 10, 2014 at 09:58 PM]
I think he gets it from work. Apparently varnish is classified as a hazardeous material by shipping companies unfortunately so to buy some online or something would mean it would have to be shipped specially.
don   [Nov 11, 2014 at 01:20 AM]
Yeah I got it from work. My boss has a friend that works for 3m and he was able to get some then let me take some home. It has a long curing process though, which means it has to get hot in order to properly harden. I have to run the ballasts for a good while before the odor is gone but it doesn't bother me. The only thing is when I put the ballast into a NEMA head, it gets hotter than when it was on the table top so excess will melt/drip off onto the lamp. I always use a cheap lamp to run it for the first hundred hours or so but doesn't hurt the lamp....just a pain to scrape off, lol.

Also, I can order class F from Allied Electronics since we have a work account. I did order some of that but haven't tried it on a NEMA ballast yet. Class F is a lower temp and probably easier to use though, and yes, it has to be shipped in a certified container.
joe_347V   [Nov 11, 2014 at 03:45 PM]
Interesting, I know my local electronics place sells a tub of transformer varnish but I believe theirs is a lower temp...probably class F. Still might try it on some noisy choke and HID ballasts I have though.

Comment 1 to 5 of 5
Page: 1