Quad ESL 57: electrical measurement (capacitance) - diyAudio
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Old 15th November 2010, 09:51 PM   #1
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Join Date: Feb 2004
Location: Caen - France
Default Quad ESL 57: electrical measurement (capacitance)

Did s.o. tried to measure capacitive value between diaphragm and one stator ?
Is there some useful info to derive from this measurement or will it be roughly the same whatever happens ?

My measurements: 200pF for a rebuilt bass panel, 550pF/360pF for an aged treble panel (outside strip/center strip). This later panel was rebuilt by a pro. and is somehow not in good shape currently (it makes hum: see my other post).

My feeling is that surface resistivity of coating may have some influence.

Quad fan ! One hobby: re-build ESL 57
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Old 19th November 2010, 01:22 AM   #2
godfrey is offline godfrey  South Africa
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Join Date: Nov 2009
Location: Cape Town
Originally Posted by Fabien Lefebvre View Post
My feeling is that surface resistivity of coating may have some influence.
Yes. Wouldn't it be more useful to measure capacitance between the stators?
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