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71.50.21.240
Its a TRW Polysyrene cap, rated 2700 pF ( 2.7 nF , or 0.0027 uF ) .There is written, on the body J2700 and also 2700J.
Is the "J" a VDC rating ?? If so, what IS the VDC rating on said cap??. Can anyone who has old TRW data tell me voltage rating?
T.I.A., very much.
Jeff Medwin
Edits: 04/20/16Follow Ups:
Appreciated. Strength in numbers, Forum member's collective knowledge.
Jeff Medwin
Jeff,
Could the "place" you sourced those parts at provide other values? I'm thinking 0.01 μF. for RIAA networks. Obviously, a low WVDC rating is a non-issue for that kind of service.
Eli D.
Eli,
This was on eBay and I needed 630 VDC, not 63 VDC.
Look around, is all I can advise. Wish it was easier for you and I, check Newark / Elements 14.
This 2700 pF is one of many values that goes across my DC LINK main caps BTW.
Jeff Medwin
Letters on caps are usually the tolerance code. J is 5% tolerance.
Jeff, AFAIR... I believe TRW used color code. Yellow is 63VDC.
Edits: 04/20/16
I would not be trusting of that chart for very vintage styrenes. I have some older clear polystyrenes with the black coding but labelled 125VL as in "volts line" or AC. I also have some black coded at one end that are also labelled 500 or 600 or 630VDC.
Wasn't red the color for 125 VDC on very vintage styrenes ? Now it is 160VDC ? Confusing...
Many phono EQ circuits or networks are at 0 volts DC as they "start" after a coupling cap. However, some networks "return" to a cathode or previous plate; so be careful. With passive EQ networks, the plate volts are usually low as there is usually a coupling cap first and then the networks "return" to ground.
Of course, as the doc keeps professing direct coupling, caution is always understood...
Thanks Larry,
I am using these caps in the range of 500 VDC on down, often as one part a combined multiple bypass bundle.
Working HARD on the A7 VOTTs in my apartment's Living Room. Fun experience, very sensitive to everything !! Doing a lot with incremental ( 16.7 pounds increments ) mass loading of 825 enclosure and Emilar EH-500 horn....total is now hundreds of pounds. A challenge for sure.
Jeff
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