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Parts list for Quad ESL 63 EHT board
Parts list for Quad ESL 63 EHT board
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Old 13th July 2017, 09:07 PM   #1
Thinker1920 is offline Thinker1920  United States
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Join Date: Jul 2012
Location: Binghamton, NY
Parts list for Quad ESL 63 EHT board
Default Parts list for Quad ESL 63 EHT board

Hi Everyone,

I recently traded for a pair of Quad ESL 63's (US studio version). The problem one is currently having is that it's playing back at reduced volume, no pops, hiss, crackles, or distortion, just reduced volume. (the neon bulb isn't flashing every second, I only get a flash when I first turn it on) After thumbing through the service manual it seems like it's probably the EHT board. I would like to rebuild it with slightly beefier components and I was wondering if I could get some suggestions from those who are more familiar with the 63's.

I know you can buy pre-done boards but, where's the fun in that? (and I'm a little on the broke side at the moment :-D )

According to the service manual the Caps are 10nf -20 +50% at 2KV
would moving up to a higher voltage rating be worth the extra money, and perhaps switching to metalized polypropylene?

The diodes are 1AV30's these are the specs I was able to find online for them:
I(O) Max.(A) Output Current 10m
V(RRM)(V) Rep.Pk.Rev. Voltage 3.0k
t(rr) Max.(s) Rev.Rec. Time 300n
@I(F) (A) (Test Condition)
@I(R) (A) (Test Condition)
V(FM) Max.(V) Forward Voltage 15
@I(FM) (A) (Test Condition) 10m
@V(RM) (V) (Test Condition)
I(RM) Max.(A) Reverse Current 2.0u
@V(R) (V)(Test Condition) 3.0k
I(RM) Max.(A) Pk. Rev. Current 5.0u
@V(R) (V) (Test Condition)
@Temp. (C) (Test Condition) 75
Semiconductor Material Silicon
Maximum Operating Temp (C) 80

Would a GP02-30-E3/73GICT-ND work as a replacement?

And should I change any of the resistors on the EHT board? and if so do you know what wattage I should get, I didn't see it mentioned in the service manual.

Thanks
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Old 15th July 2017, 08:28 PM   #2
Manolo47 is offline Manolo47  Puerto Rico
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Location: San Juan, Madrid
Are you sure it's that? It could be one of the panels.
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Old 15th July 2017, 10:32 PM   #3
Thinker1920 is offline Thinker1920  United States
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Join Date: Jul 2012
Location: Binghamton, NY
Parts list for Quad ESL 63 EHT board
Pretty sure it's reduced HV, especially with the neon bulb acting that way and no sparks, crackles, hiss, zaps when idling or distortion when playing.
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Old 18th July 2017, 02:02 AM   #4
stokessd is offline stokessd  United States
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I use those GP02-30 diodes in my EHT rebuilds. The 63 EHT's are typically pretty reliable, especially compared to the original ESL supplies. There's three things that I've seen go bad: The MOV in the front end, the diodes, and the capacitors. Typically the diodes are my first suspect, and I shotgun all the diodes. I then check the MOV. The voltage going to the multiplier string should be about 500V. IF that's correct, and the diodes are replaced, I then shotgun all the ceramic caps.

The neon bulb should flash when the speaker if first turned on and then blink slower and slower as the panels charge. If you are in a dry climate and have good clean panels, it can be 30 seconds or longer between flashes.

Because you have low output, that board is a reasonable place to check.

One easy thing to do is to swap bases between speakers and see if the problem follows the bass or not. The bases are held to the panel assembly with 8 nuts and three wires (plus antenna). So it's pretty easy to swap. And that will tell you where you need to be looking for the problem.

Sheldon
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Old 18th July 2017, 06:50 AM   #5
Thinker1920 is offline Thinker1920  United States
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Join Date: Jul 2012
Location: Binghamton, NY
Parts list for Quad ESL 63 EHT board
Here's what I've been able to put together so far

8 diodes GP02-30 (Mouser part# 625-GP02-30-E3)

14 Capacitors (for the EHT board) 10nF @ 2KV (Mouser part# 594-S103M69Z5UP63K7R)

1 Capacitor (for the neon board) 47nF @250 (I went with Mouser part# 505-MKP4J024703FKSSD)

1 Varistor (Mouser part# 871-B72210S461K101)

Resistors:

2 220K @ 5% (Mouser part# 279-RR02J220KTB)

1 180K @5% (Mouser part# 594-5083NW180K0J)

1 56k @ 5% (Mouser part# 594-5083NW56K00J)

1 10M @ 5% (Mouser part# 594-VR37000001005FA1)

I have the M-12525 ISS 4 version of the board
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