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QUAD ESL 57 A little work on the loudspeaker  "B"
QUAD ESL 57 A little work on the loudspeaker  "B"
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Old 16th July 2017, 07:02 PM   #31
Nemeske is offline Nemeske  Hungary
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Default The show must go on . . .

Today, I had time for some 'delicate' work. At least, I thought that it would be delicate.
I managed to source the same insulating tape again I used for the other bass panels with good outcome (the color nearly match the panel's) so I wanted to do the perimeter and to check the continuity at the stator tags and repair if necessary the recently acquired silver paints.

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I found almost all the rivets at this silly panel moving around, so I used my hot glue to affix them.


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It doesn't look good at all, but who cares, these won't resonate any more, and still repairable if I would be about to take it apart some time in the future. However, this panel now looks like that it had endured some rought time....




Next step was to check the continuity again. Both panels were bad sadly... (I didn't do anything to them only vacuumed the with a brush)
One panel was bad at the back stator and the other one was at the front stator.
I used the silver defogger paint with luck.


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I wanted to remove the old wiring from the tags. I used a wet hanky with success at the other speaker as for heatsink. But at this one it turned out to be a bad idea. I managed to melt off a solder tag succesfully... However, this side was one of the broken ones, so it was barely there.



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I was a bit desperate, but I had found a solution that was ugly but worked.
I removed one of the tags from the installment that could be found at the bottom of the speaker for earthing. This tag looked exactly the same as the riveted one so I used it and a M4 screw to secure it to the stator again.


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This was for today. Looks great, arent they?


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Old 19th July 2017, 05:27 PM   #32
Nemeske is offline Nemeske  Hungary
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I am now thinking about to fix the damaged areas too with this silver paint, and to cover at the end with some kind of paint. I am surei have to be very carefull not to damage the diaphragm or not to cause short circuit between the bias and the stator signal strips
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Old 25th July 2017, 11:08 AM   #33
Nemeske is offline Nemeske  Hungary
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Default assembling the audiotransformer and the EHT

I had time for to do these two. I used silver-plated solid copper wire insulated with heat-shrink tube for the connections.
I used up 3 beeswax-cubes for refilling the bin.

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Last edited by Nemeske; 25th July 2017 at 11:13 AM.
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Old 25th July 2017, 11:11 AM   #34
Nemeske is offline Nemeske  Hungary
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for EARTH continuity, I rasp out all the holes in the supports. The bolts will do the job.
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Old 6th August 2017, 10:10 AM   #35
Nemeske is offline Nemeske  Hungary
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Default Sanded, painted and glued the dustcovers, and completed the treble panel

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Old 6th August 2017, 10:14 AM   #36
Nemeske is offline Nemeske  Hungary
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Old 7th August 2017, 04:51 AM   #37
Soldmyquads is offline Soldmyquads
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Really clean work. Coming along good.
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Old 7th August 2017, 09:47 AM   #38
Nemeske is offline Nemeske  Hungary
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Quote:
Originally Posted by Soldmyquads View Post
Really clean work. Coming along good.

Hey, thank you!
Unfortunately, the glue still not the best for glueing the treble section's mylar as it doesn't bond well to it, and at some places the PE-tape peels the foil off the wooden frame, but these will be under the basses perimeter, so I do not really care. At the bass panel's hostaphan it sticks very good. I was told that I should use PVA glue, but I think it isn't a very good idea as it sticks rigid, and if I have to redo the dustcovering process again due to a puncture or wrap on the film, it would be a real work to remove the residues of the PVA glue. This inner tube repair glue is relatively easy to be removed from the frame after it has dried.
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Old 14th August 2017, 09:13 PM   #39
Nemeske is offline Nemeske  Hungary
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Default Wrapping the panels . . .

I managed to somehow 'repair' the flake-offs with conductive paint (defogger kit) and I covered it with O.K. ornamental result with mixed grey spray paint.
All made by hand with a RG595 fine brush.
Needless to say that this way very time consuming. I took 1 day to paint and an another one to redo the dustcovers and do the neccessary soldering.






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Old 14th August 2017, 09:29 PM   #40
Nemeske is offline Nemeske  Hungary
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Pictures: after the 'painted' panels dried, they were ready for wrapping in clingfilm. Before wrapping, I vacuumed and brushed them for almost an hour to remove the tiniest bit of paint flakes both from the stators and the diaphragm, too. First, I washed down the stators with a cloth and alcohol, then brushed and vacuumed them. The brush has long enough hair (and soft) to reach down to the diaphragm, so I removed the most with the utmost care.
A forumer told me that it's time to split the panels, and remove the diaphragm and redo all the paint and the conductive stripes on the stators. I am in a good hope that it isn't necessary still. I currently do not have the knowledge and time for such a tough task (and forgot to mention the money).


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