Quad ESL Cap mods

Hello Johnsonwu. I doubled the Duelunds to get the 20W.

Good for you then cos I had to change out Duelunds on my friend's JMLab Micro Utopia in favor of Mills MRA12s. The Duelunds caused a major saturation in the sound when overdriven.

Howdy folks .

I have recently acquired a pair of ESL-989's and whilst mugging up on user tips and tweaks I came across this most informative series of posts, amongst others, recommending a number of modifications ,chiefly the replacement of the 220uf lytic with metallised or film/foil poly + associated resistor.

I was under the impretion that those componants would be reasonably easy to get at ala the 63's however I was kinda dismayed to see the components connected directly to the PCB

I'm pretty good with point to point circuitry however I tend to shy away from PCB work .

I would be grateful for any further tips regarding the safe removal of the 220uf + R15 together with any further info re securing the replacement polypropylenes into the circuit .
Any under the hood images post modification would be most appreciated.

The PCB is one sided, so you will need to carefully unscrew the mounting screws and flip it around and unsolder the orginal sand resistor and lytic.
You will need special nylon tie wraps to tie the new (HUGE) lytic and bolt the tie wrap onto the large screw that the panel is mounted onto the base.
You will need to use some 16 to 14 gauge wire to extend the leads of the cap to reach the appropriate connection points.

Thank you for the further information Johnsonwu.

I was also considering replacing the internal 220uf/1.5ohm with a section of wire to complete the circuit, placing the components in a separate box outside the base , connected via additional RCA's ~ Speaker cables > box > 989 speaker binding posts.

That way I could utilize several or large size Poly caps that would be difficult to shoe horn into the space available in the base!

Feasable Folks ? or a little Heath Robinson !