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Old 3rd May 2013, 02:07 AM   #1
3GGG is offline 3GGG  Australia
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Default Help ID this cap please

This is a DC blocking cap in a vintage compression driver, can anyone help me identify the value?

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Old 3rd May 2013, 02:51 AM   #2
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18nF 200V is likely
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Old 3rd May 2013, 03:19 AM   #3
3GGG is offline 3GGG  Australia
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really nF, seems small for a DC blocking cap?
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Old 3rd May 2013, 03:45 AM   #4
Enzo is offline Enzo  United States
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DC blocking? As opposed to low freq blocking, as in the most baic of crossover circuits? Some compression drivers even came with a protective cap for that reason.
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Old 3rd May 2013, 04:03 AM   #5
3GGG is offline 3GGG  Australia
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Yes, its just there as a protective cap against DC. Crossover is active at 7K.
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Old 3rd May 2013, 07:20 AM   #6
mjf is offline mjf  Austria
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what are the dimensions of this cap?
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Old 3rd May 2013, 07:44 AM   #7
3GGG is offline 3GGG  Australia
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roughly 10mm x 20mm x 50mm long
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Old 3rd May 2013, 01:37 PM   #8
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It would have to be high impedance for 18nF crossing at 7kHz, about 1k2.
Is this a piezo?
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Old 3rd May 2013, 06:32 PM   #9
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Yamaha 4271 or 4281.

(the fancy Japanese cap company only made mica and foil caps, afair)
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Old 3rd May 2013, 07:19 PM   #10
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by 3GGG View Post
This is a DC blocking cap in a vintage compression driver, can anyone help me identify the value?
It is an 18µF/10%/200V film cap.
The value is consistent with the DC blocking function and the size.
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