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Have to fix my Quad ESL 57
Have to fix my Quad ESL 57
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Old 20th January 2020, 12:09 AM   #171
malthuse is offline malthuse  Canada
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One other thing is that the membrane on the one with the red border has fused to the stator. Itís not ripped. I can push it out from the other side and it lifts off so I think the stators can be saved.

I really wonder what the other one is like seeing as it sound fine.
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Old 20th January 2020, 03:20 PM   #172
stokessd is offline stokessd  United States
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That is really weird, I've never seen anything like it. That's certainly not normal for a panel rebuild. The only thing I can think is that if Wayne used the same crappy nylon coating that quad used, and put it on REALLY thick, the "second" diaphragm you see could just be the coating that pealed off in a unit.

In your picture, you can see the real diaphragm glued to the bottom stator, and the mystery sheet is not really glued to anything. I suspect that is his conductive coating, but anything is possible.

Sheldon

quadesl.com
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Old 21st January 2020, 02:50 AM   #173
malthuse is offline malthuse  Canada
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Itís pretty damn weird.

Itís not Mylar as itís quite stretchy and you can roll it into a tight ball like wax. I think youíre right about it being the coating. On the side with the membrane the membrane is stuck to the stator pretty much along the length and width of the panel. I think when I split the panel it pulled off the coating as it came away with the free stator.

Itís a miracle it made any noise at all!
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Old 21st January 2020, 01:09 PM   #174
Fabien Lefebvre is online now Fabien Lefebvre  France
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Mylar itself is still glued ? You may be able to remove this wax, if not applied on both sides of the diaphragm.
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Old 21st January 2020, 01:47 PM   #175
malthuse is offline malthuse  Canada
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It’s on both sides. It’s completely stuck to both stators.
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Old 21st January 2020, 01:55 PM   #176
Fabien Lefebvre is online now Fabien Lefebvre  France
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Too bad. No choice then: change mylar. Or find a spare part for the full treble cell.
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Old Today, 05:11 PM   #177
legopart is online now legopart
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Ok, little bit about me.

I decided to take some measurments from EHT
It took some time until I found how to do that correctly.
first I dont know the resistence of the DC Voltmetter, so I checked and checge the resolts:
actually is ~10Mohm (-5%)
Click the image to open in full size.
The test used 1Gohm5% + 20Mohm1%
Click the image to open in full size.

6000v Used build in soldered resistors of 20Mohm
1500v Used build in soldered resistors of 40Mohm

The m is:
6000v is 31.4v 31.3v for 20Mohm(||10Mohm Voltmetter) :: 1000+20 (+20) Mohm
1500v for 8.61v 8.62v for 20Mohm(||10Mohm Voltmetter) :: 1000+20+20 (+20) Mohm

not correctly but closed resolts after my math I got:
4835v
1350v

not going to check again.



build the protection board by my decision.
Stupiedly again used too much from the laquer that I forgot to throw before

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

each hole instead the soldered one drilled through and checked twice.
half CM mistake (from the planned but still ok).

Last edited by legopart; Today at 05:15 PM.
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