2. speakers
  3. 1237737662

Quad ESL Cap mods

Hello,
I have a pair of Quad 988 I'm considering replacing the electrolytic 220uF Capacitor for a film cap...

For those who have done it -- what caps give you the clearest extensions in the highs and improved mids without mudding the low???

Also, who makes a 220uF film cap? All I seem to find is lower values? Is it best to wire a bunch of lower value caps together for a total 220uF (if so, should you mix electrolytic caps with film caps - like some modders do) or is it best to have a single 220uF cap?

I do see Mundorf has 200+uF caps in their Tube Cap line -- are these Mundorf Tube Caps appropriate for the Quad ESL application? how do they sound?

Thank you guys very much for any and all input into this, as I'm just beginning my Quad mod journey...
128x128grateful

Showing 4 responses by face

face
516 posts
 
The Mundorf is rated at 250V, which should be more than enough.
face
516 posts
 
Mundorf has a 220uf MCap, not the tube line.

Where is this in the circuit? I highly doubt a cap that large would be located anywhere near your tweeter circuit.

You can solder a few smaller values in parallel. Since you're looking to upgrade, I would avoid electrolytic caps entirely. Dayton, Solen, and Mundorf all have large values.
face
516 posts
 
I have a 220uf Mundorf here and it's only the size of 1 soda can.
face
516 posts
 
It is a film cap and is a #71348 available from Parts Connexion.

I used it in a similar application, to filter out bass from a open baffle speaker. I didn't notice any negative effect on SQ, but it was only used on a woofer.

If you use a smaller cap you will lower bass response.

A Mundorf tube cap is not made for this application.
More to discover