Please help me identify these .45 3kv TRW caps - diyAudio
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Old 5th October 2011, 01:48 AM   #1
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Default Please help me identify these .45 3kv TRW caps

Hi folks-

I came across a cigar box of these TRW .45uF 3kv (!!) caps recently.

They are metal cylindrical with axial leads. 2 5/8" (66mm) long; 11/16" (18mm) diameter.

Hermetically sealed ends. Gold plated leads. The type on the caps reads:

2760307-2
TRW 957
LMSC-35-1
.45 +- 10%
3000 VDC
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File Type: jpg trwcaps2.jpg (26.2 KB, 140 views)
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Old 5th October 2011, 01:50 AM   #2
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Could anyone here shed some light on what these caps are, particularly the dielectric? Any help would be greatly appreciated.

Thank you- Kent
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Old 5th October 2011, 02:34 AM   #3
TheGimp is offline TheGimp  United States
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Cut one open and dissect it.

Just wear gloves in case it is oil filled, could be PCBs.

What do they measure? .45uF?
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Old 5th October 2011, 02:46 AM   #4
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Quote:
Originally Posted by TheGimp View Post

Cut one open and dissect it.

i wouldn't-

higher voltage caps are not all that cheep.

post #5 -

TRW Capacitors Question

Last edited by tomtt; 5th October 2011 at 02:47 AM. Reason: 7
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Old 5th October 2011, 03:04 AM   #5
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Yes, they measure around .45 uf (4.3, 4.6, 4.4, etc.).
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Old 5th October 2011, 04:09 AM   #6
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Tektronix 2235 scope has similar caps. I also want to know what they r.

Gajanan Phadte
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Old 5th October 2011, 10:06 AM   #7
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Caps with hermetically sealed glass ends are oil filled, usually paper in oil. Unless you can find some manufacturer specs somewhere you might have to open one up to check the dielectric. As mentioned earlier, the oil could contain highly toxic PCBs so take extreme care if you open them. Not sure exactly what 'extreme care' would entail. Gloves and mask at least. Then the cap should be disposed of as hazardous waste.

Probably easier to just try them and see if you like them.

. . . Charlie
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Old 9th March 2012, 10:44 AM   #8
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They r PIO i.e. paper in oil

For photo, go to
diyaudioprojects.com/Solid/JFET-Phono-Preamplifier-Kit/

Gajanan Phadte
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Old 9th March 2012, 03:40 PM   #9
TheGimp is offline TheGimp  United States
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Those are soviet not US made caps.

This company claims they are film/oil caps, but do not specify what film.

8 NOS vintage TRW 45uF capacitors 3000VDC 3kv hermetically sealed film oil caps
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