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 Post subject: Capacitor ID Help
PostPosted: Mar Thu 08, 2018 1:00 am 
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Joined: Jan Sat 16, 2016 10:03 pm
Posts: 376
I went to a garage sale last weekend and bought a box of old electronic parts and NOS tubes. I found a rather large lot of NOS capacitors in the box that I'm unfamiliar with and was hoping someone could assist in proper ID such as paper, unreliable, reliable etc.....

Thank you for any help

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 Post subject: Re: Capacitor ID Help
PostPosted: Mar Thu 08, 2018 1:16 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 33560
Location: Maryland 20709, USA
From the markings I would expect them to be European, but no guarantee.

They're modern film caps of some type, not electrolytics or micas.

I expect they're good, although the 400-volt rating might be low for use in transformer sets.

Nice caps.

- Leigh

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 Post subject: Re: Capacitor ID Help
PostPosted: Mar Thu 08, 2018 1:40 am 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 3351
Location: The Old Dominion VA 23518
They look very Philips-sy, with the last three digits of the part number being the value in picofarads, expressed as two significant digits and a multiplier (473.....is 47000pF, 47nF, or 0.047uF). The prefix (34155) is part of the longer, 9 or 11-digit part number, but still incomplete for datasheet lookup. Very handy when the markings fade with solvent use as they often do. Good caps - probably Styro/polyester, or metalized polypropylene film caps.

Edit: PS - the only failures in those molded caps comes from exposure to heat. Some Motorola Quasar II sets used them right up against the Vertical Output tube, which slowly cooked them (or the Roerderstein film caps Motorola also used). Keep them below chassis, away from a heat source and they'll last forever.

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Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: Capacitor ID Help
PostPosted: Mar Thu 08, 2018 1:54 am 
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Joined: Jan Sat 16, 2016 10:03 pm
Posts: 376
Thanks for the speedy responses. Good info. You guys never let me down.


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