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 Post subject: Tell Me About This Cap?
PostPosted: Sep Mon 27, 2021 3:35 am 
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Joined: Jun Sat 09, 2007 8:14 am
Posts: 5112
Location: Melbourne, Florida
Tell me about this cap: The fuzzy markings in the photo are :
0.07 2% DT
800 SA ,
A26 7330.

Anyone?

RRM


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 Post subject: Re: Tell Me About This Cap?
PostPosted: Sep Mon 27, 2021 5:19 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 27886
Location: Detroit, MI USA
One would reasonably assume that it was a .07 @ 800 volt cap, and the DT marking could indicate it is a special type, perhaps a snubber designed for fast switching circuits. The original manufacturer's specs would need to be located to verify that.

Being of 1973 manufacture, it should be a film type and most likely still good, unless something related to the circuit it was used in caused it to fail.

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Dennis

Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Tell Me About This Cap?
PostPosted: Sep Mon 27, 2021 6:24 am 
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Joined: Jun Sat 09, 2007 8:14 am
Posts: 5112
Location: Melbourne, Florida
0.07 @ 800 V was also my guess. The voltage rating is what I've wondered about. I have several and they are definitely good. I've used them at well over 1KV (I needed something quickly) with zero long- term failures.

RRM

p.s. These are some of my mystery parts - I have no idea where they came from.


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 Post subject: Re: Tell Me About This Cap?
PostPosted: Sep Mon 27, 2021 11:30 am 
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Joined: Sep Thu 14, 2006 3:27 pm
Posts: 14659
Location: Carmel, Indiana
0.07uf at 800v would be my guess. Should still be usable.

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Michael Feldt
www.indianaradios.com


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 Post subject: Re: Tell Me About This Cap?
PostPosted: Sep Mon 27, 2021 3:36 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 11014
Location: Long Island NY
I would not use a film cap that old in a high energy RF or pulse circuit (eg. a ham transmitter or color TV horizontal output stage) as the dissipation is probably measurably higher than it was when new due to aging of the plastic film. Nor would I put it in a very low noise circuit as the excess noise will likely be very high for the same reason. But certainly in conventional analog circuitry there should be no problem.

The 2% probably refers to the tolerance which would put it into the precision catagory. It wasn't a cheap capacitor when it was new.

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 Post subject: Re: Tell Me About This Cap?
PostPosted: Sep Tue 28, 2021 1:44 am 
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Joined: Jul Fri 18, 2008 10:02 am
Posts: 1995
Location: near ST Louis Mo 62002
As long as the end crimp of the foil to the leads is good ( low esr ) the cap should be good for the duration .

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Mark
(Conti the brain damaged robot )


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