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Have to fix my Quad ESL 57
Have to fix my Quad ESL 57
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Old 2nd January 2020, 12:50 PM   #161
legopart is offline legopart
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have to decide if I gonna coat the EHT with isulation lacquer or just close it with the wax so next generations/ or even I could remove and disolder this work.
Hope to finish the EHT boards and try them on one bass plate with music.
still have to make the protect board


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


Decide to do the forbiden thing and repaint the front covers.
too bright to my oppinion but identical to the original.
applied without primmer.
covered with cheap spray can.
(all the parts washed last month with water and metal parts covered with trempantine once, wood part covered with Teak oil before paint of the black parts with cheap spray. as I said)
*Teak oil + any spray applied twice (woods and metal).
Click the image to open in full size.
Click the image to open in full size.

Last edited by legopart; 2nd January 2020 at 01:04 PM.
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Old 5th January 2020, 11:13 AM   #162
lcsaszar is offline lcsaszar  Hungary
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Nice job. For the EHT I recommend bee's vax. Like the original. You can get it at Christmas fairs as those fancy yellow candles with honey smell.
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Old 6th January 2020, 09:22 AM   #163
tschrama is offline tschrama  Netherlands
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Lloks great!
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Servicing guitar and Bass amp, giving amp building workshops at my small atelier www.sgravenmade.com
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Old 12th January 2020, 11:15 AM   #164
legopart is offline legopart
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decide to trow the Corona and cover with it the EHT
Click the image to open in full size.
Electronic worst engeneering ever!
Used the capacitor on the 0 line
Click the image to open in full size.

Wax returned.
and use too much hot glue
Click the image to open in full size.
Click the image to open in full size.

Really my bad day

plan to end with the crossover board and try it on one bass panel.


short in time this month.
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Old 13th January 2020, 02:34 AM   #165
legopart is offline legopart
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Couldn't be patient and done "Test nomber1"
resolts:
- the pannel really quite, used 100% of the amp SONY STR-DN1080 (first tested on a cheap one)
-sound little bit distorted/harsh/and scretchy on high tones (+ it resonate with house furniture)

What things I added in addition to regular instruction:
- Bass panel Bias/EHT added 20Mohm resistor (20Mohm*2 to Treble bias) like Sheldon soggested
- added 2.2Ohms resister to sound input ("Crossover"), to stablize the inpidence, protect the amp and protect the panels from over load.
-Bias voltage values not tested, I do everything righ and I not having skills to do so.
-added 32mA 250v Fast Fuse to input voltage line (230v)
-not full day tested.

Issues:
- the bass panels is tilted/bent and not restored
- no treble panels
- no back wool / felt on the back side

video of the testing (sorry for bad quality and the mess)
YouTube

Last edited by legopart; 13th January 2020 at 02:47 AM.
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Old 19th January 2020, 05:27 PM   #166
malthuse is offline malthuse  Canada
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Hi Guys,
I know this is a mixed bag posting but I don’t want to start a new thread. I found out what the thumping noise was at high bass. The screws on the rebuilt bass panels have thread sticking out. The dust covers were punctured by them in a couple of places. I think at big bass excursions the dust cover is getting caught on the screw ends.

Now for something much worse. One speaker is quieter than the other. Has been for a while. While I had everything apart I thought I would trouble shoot. Here’s what I did after swapping speaker left and right and amps.
1) Swapped psu. No change.
2) Swapped audio transformer. No change.
3) Disconnected bass panels. The treble panel on one is at least double the volume of the other which sounds dull in comparison.

There’s no indication of arcing. I’m thinking I might have to rebuild as depressing as that is as I paid a small fortune to do it the first time. Are there any external checks I can do to the tweeter without power that could tell me what’s wrong?
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Old 19th January 2020, 05:29 PM   #167
malthuse is offline malthuse  Canada
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Just a quick change here. It actually doesn’t sound duller just way quieter.
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Old 19th January 2020, 09:37 PM   #168
legopart is offline legopart
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this thread is moor like my fixing bloog.
you can actually open a new one.
but if it can help you somehow I will not post here new posts ubtill you will get your answare

If there is some punched hole on dust cover then put on it some tape to cover this hole

do you tried to switch between the speakers on the amp connection?

also can be the EHT or the crossover board.

if you have some skills to work with top level voltage (6000v) then try to switch between working parts.
if not then dont open the speaker
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Old 19th January 2020, 09:51 PM   #169
stokessd is offline stokessd  United States
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Quote:
Originally Posted by malthuse View Post
Hi Guys,
I know this is a mixed bag posting but I donít want to start a new thread. I found out what the thumping noise was at high bass. The screws on the rebuilt bass panels have thread sticking out. The dust covers were punctured by them in a couple of places. I think at big bass excursions the dust cover is getting caught on the screw ends.

Now for something much worse. One speaker is quieter than the other. Has been for a while. While I had everything apart I thought I would trouble shoot. Hereís what I did after swapping speaker left and right and amps.
1) Swapped psu. No change.
2) Swapped audio transformer. No change.
3) Disconnected bass panels. The treble panel on one is at least double the volume of the other which sounds dull in comparison.

Thereís no indication of arcing. Iím thinking I might have to rebuild as depressing as that is as I paid a small fortune to do it the first time. Are there any external checks I can do to the tweeter without power that could tell me whatís wrong?

Sounds like you did everything I'd suggest to do. Swapping the power supply and input transformer with no change eliminates them. So now it's pretty obvious that the treble panel is bad.

Sorry to hear you spent a fortune on that rebuild.

Sheldon
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Old 19th January 2020, 11:03 PM   #170
malthuse is offline malthuse  Canada
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Thanks Sheldon. Just for the record this was not a Sheldon rebuild and thereís no reason to think it failed due to construction...that being said I decided to take it apart as itís a write-off anyway.

Is it me or should these not have two membranes???? One seems to be fairly intact. The other is a total mess. Big hole in the middle.

Is there something Iím missing here?
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