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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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Location: Maine
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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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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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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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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Old 26th October 2017, 07:34 AM   #6
Thinker1920 is offline Thinker1920  United States
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Parts list for Quad ESL 63 EHT board
So I rebuilt the EHT board and it's putting out the correct HV but somethings not right with the clamp/detector board board, I'm only getting very faint audio through the speaker with the amp turned up. (before it was slightly reduced but all there, no distortion etc.) The only thing I did on the clamp/ detector board was to replace C28 (1,000 uF electrolytic) since it was original and getting up there in age.

I've been going through the trouble shooting section in the service manual and when I get to the point were it says to measure the DC volts on the gate of T1, I get only 1.2 mV. the block manual only cares if it's greater than 0.25 volts it doesn't mention what the normal value should be. But if I ignore that it suggests that my problem might be D11 and D12, Does that sound like it could be the culprit?
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Old 29th October 2017, 06:20 PM   #7
stokessd is offline stokessd  United States
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Based on your last post, I'm assuming that the the bad speaker is WAY quieter, like 20dB down. Chances are that your clamp TRIAC is bad. The spark clamp circuit turns on an TRIAC that shorts the speaker input (because screw your amp). IF that TRIAC has to sink too much current, it can fail. This leads to it always being "on" and your speaker always being shorted and thus very quiet.

Pull the TO-220 device on the heat sink off the clamp board and try your speaker. I bet it will play like before. I've seen this several times on over-driven speakers.

There were several clamp-board variations, some had a couple of heat sinked to-220 devices. if you are confused drop me an email with a picture of your board and I'll be glad to help you out.

Sheldon
quadesl.com
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Old 4th March 2018, 08:23 PM   #8
tubularfluxus is offline tubularfluxus  United States
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Did you have any success troubleshooting your speaker? I am running in the same issue. Both my Quad ESL-63 play quietly. I have replaced all diodes and caps on one of the EHT board and now the speaker plays even more faintly. I can barely hear any sound at all.
I haven't tried swapping the bases or the EHT boards yet.

Should I try replacing the TRIAC T2800B and TAG92A-3 on the clamp board? Do you know what part number I could use to replace them?

Thanks
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Old 5th March 2018, 01:02 AM   #9
stokessd is offline stokessd  United States
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Yes, you should replace the triac which is driven by the 555 timer. Remove it from the board and try running the speaker without it. You won't hurt anything if it's not there, you just won't have the clamp circuit, so don't go crazy with the speaker.

Write back if that doesn't fix it.

Sheldon
quadesl.com
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