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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
mksj2
7 posts
 
Hi Tsushima1, if you need some photos of the quad 988/989 mods/info, I can email photos of the mods I installed. I would leave the stock electrolytic cap/resistor in place and clip out the PTC that connects them on the PC board to the wire going to the step-up transformer, then reroute the speaker input wires. You need to wire in a separate bank of film capacitors/input resistor that are ideally mounted in the base (an not on the PC board).
tsushima1
1,165 posts
 
My apologies for the Tardy Reply gents , I have only just returned to this project and thread.

Terry9 and MKsj2 , Thank you kindly for your assistance, I have emailed you both .Likewise Grateful , just off to admire your system.

califhifi
1 posts
 
Yes please send me pics of the 989 mod
mksj2
7 posts
 
Let me know how you want the information to be sent or posted, I have provided other forum members with more detailed information. I am not aware that the information can be uploaded to this forum. Newer Quad models after the 988/989 present more of a challenge because of their interior space, and have had more quality build issues.
liffy99
1 posts
 
I'm thinking of getting a pair of 2905s and really interested in this mod discussion. But a) i am rubbish with a soldering iron and b) don't fancy messing with the high voltages involved.
is there anyone in the UK that can provide an upgrade service along the lines of Plitron transformer substitution or caps swap etc ?
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