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Old 15th April 2005, 10:06 PM   #1
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Default what is the cap

i need a cap on the circuit board in the picture, it is the silver axial in front of the orange drop. i am told it is made of a squishy rubber or plastic or sumthing as opposed to polypropelene or a harder plastic, im not very sure how true that is though. i am also told that they are very high quality and very expensive and are only found in high end audio equipment. it is a multisection 0.01Fx2 not sure about the voltage.it looks like a regular rolled up poly and metal film cap. i would be happy with a single section cap or any info on this at all. anyone know anything or ever seen this cap.
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Old 15th April 2005, 10:15 PM   #2
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It look like a vulgar polystyrene capacitor.
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Old 15th April 2005, 11:42 PM   #3
Enzo is offline Enzo  United States
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Is that out of a Wah Wah?
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Old 16th April 2005, 12:41 AM   #4
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yes that is exactaly what that is, it is a clyde mccoy upgrade for a dunlop wah
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Old 16th April 2005, 12:47 AM   #5
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i searched and searched for a "vulgar" cap, didnt find anything anywhere about them, are you sure its not vishay maybe. or could you elaborate, thanks
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Old 16th April 2005, 12:53 PM   #6
Giaime is offline Giaime  Italy
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Quote:
Originally posted by hi_im_sean
i searched and searched for a "vulgar" cap, didnt find anything anywhere about them, are you sure its not vishay maybe. or could you elaborate, thanks
Ahahahah... he didn't mean that! He wanted to say that this cap looks like the standard ones you can get anywhere... so vulgar meaning very popular.

Stick whatever audio-graded one... but I think even them are just hype. Use whatever you can get... just the right value...
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Old 16th April 2005, 05:41 PM   #7
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well you see... i agree with you giaime, but my boss, the one who posed this question to me ,thinks its some special, cool rare cap, but i keep arguing with him that it is some sort of rolled up film and foil cap and to just use a high quality equivelent like an auracap or solen's fast caps. i bet you wouldnt even notice the difference since it is for a guitar wah pedal going into a guitar amp, so i dont think there is any reason to be anal about that one cap, especially for a guitar.
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Old 16th April 2005, 05:50 PM   #8
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Hi Sean

This type of capacitors (polystyrene ) are used in circuits , where low loss and low tolerance are crucial.

If you can't find one of this , use a low tolerance polypropylene type .
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Old 17th April 2005, 07:08 AM   #9
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Quote:
Originally posted by Tube_Dude
Hi Sean

This type of capacitors (polystyrene ) are used in circuits , where low loss and low tolerance are crucial.

If you can't find one of this , use a low tolerance polypropylene type .
Yes, but for critical oscillators/radio things, for audio I remember that someone tried many types of plastic capacitors and posted the graphs. Polystyrene had a very bad attitude, maybe it introduces some non-linearities that make a wah sound good... I don't think so.

Prepare a blind test for your boss: use 2 indentical wahs, one with a cheap cap and one with a polystyrene cap. I bet he will prefer the cheap cap...
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Old 17th April 2005, 09:52 AM   #10
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The silvery one is a regular type Styroflex, or Polystyrene as Carlos mentioned, generally called Silver Mica on this site.

Siemens made lower cost versions like the one you posted, the B31861 series.
The absolute best up till today are the Orange Siemens B31531 series, Rifa made the excellent PHE 425 Styroflex.
Styroflex's go up till around 56 nF.
I used the B31531 for RIAA networks, cost around $3.50 the piece.

A general Siemens 0.01 uF styroflex version measures about 1/3" x 2/3".
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