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Old 12th August 2005, 11:21 PM   #1
Trout is offline Trout  United States
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Question Sprague/Cap Color Codes ?

My gal bought me an organizer draw set at a garage sale earlier today. Ahh the summer treasures.

So, I got a couple drawers of old unused what appears to be sprague bumble bee's.

Trying to figure out the color codes has us pulling out each others hair!, well not really but, Its a head scratcher.

I looked up a color code chart and found one HERE, BUT, I must be missing something.
Click the image to open in full size.
I Think I get the value of 470000 MMFD (.47uf) and tolerance of 20%, But the voltage is missing a band? Or is there a no band secret?
Or have I missed the mark entirely?
Gene
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Old 13th August 2005, 04:30 AM   #2
PRR is offline PRR  United States
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> But the voltage is missing a band?

The diagram shows 1st and 2nd figure, multiply by 100.

I would assume if there is just one red band, you have "2" * 100 = 200V.

That also makes sense for 470,000pFd in that size body. It isn't big enough to be 0.5uFd and 400V or anything like that.
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Old 13th August 2005, 04:37 AM   #3
Trout is offline Trout  United States
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Quote:
Originally posted by PRR
> But the voltage is missing a band?

The diagram shows 1st and 2nd figure, multiply by 100.

I would assume if there is just one red band, you have "2" * 100 = 200V.

That also makes sense for 470,000pFd in that size body. It isn't big enough to be 0.5uFd and 400V or anything like that.

OK,, Got it,, But it is rather large compared to most to 400V's I have in the orange labeled spragues black tubulars. Must Be an age thing. I suppose they might be useful someplace lol
Gene
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Old 13th August 2005, 08:18 AM   #4
Enzo is offline Enzo  United States
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"That also makes sense for 470,000pFd in that size body. It isn't big enough to be 0.5uFd and 400V or anything like that."

Um... isn't 470,000pf same as 0.47uf? I find that if it can be a 0.47uf but is not big enough to be a 0.5uf, that's an odd concept.

That is a 0.47 alright. I changed out a couple of those last night in an old jukebox amp.

I agree on the voltage. Add two zeros. If there are two bands, it just means the voltage is over 900.

Yes, caps were much larger back then. In restoring jukebox amps, I often replace these, the newer caps are so much smaller they many times do not reach. The circuits were laid out with this size part in mind. I wind up having to extend the leads. On the other hand, a cap that used to sit to the side of a tube socket and went around from say pin 1 to pin 7, can with modern caps be placed right between the pins.


Back before pico was used, we did indeed call that micro-microfarad. mmfd or mmf. A lot of guys - us electronic types can be so clever - called that mickey mouse. "Gimme a 47 mickey mouse cap please." Inevitably someone would ask for a 10 mouse lytic just to be cute.
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Old 13th August 2005, 05:06 PM   #5
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by Enzo Um... isn't 470,000pf same as 0.47uf? I find that if it can be a 0.47uf but is not big enough to be a 0.5uf, that's an odd concept. [/B]

0.47uf is the same as 0.5uf, but 200v is not the same as 400v.
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