Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Planars & Exotics ESL's, planars, and alternative technologies

Have to fix my Quad ESL 57
Have to fix my Quad ESL 57
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th August 2019, 01:23 PM   #1
legopart is offline legopart
diyAudio Member
 
legopart's Avatar
 
Join Date: Oct 2016
Default Have to fix my Quad ESL 57

Have such condition,
got them last month and they sound crackling on high volumes on some cheenies amp.
one them makes the amplifire set to "defense mode" when the sound to high volumes
First I want to set why it happening?
I suspect first of all the:
- Tweeter (Squeaker?) to turn off (unsolder it connections)
- Replace the Sound Transformer from another speaker
- Replace the Bias Transformer from another speaker

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

Need a lots of help here, how to restore and fix it.
In addition I searching for another amp,
At this moment I have:
- some chinies Lepy
Click the image to open in full size.
and some receivers like Sony STR-DN1080 and some Piooner

In addition: how to disscharge it, without waiting one day after each procedure?

thanks for any help!

Last edited by legopart; 6th August 2019 at 03:09 PM.
  Reply With Quote
Old 6th August 2019, 08:49 PM   #2
legopart is offline legopart
diyAudio Member
 
legopart's Avatar
 
Join Date: Oct 2016
Ok, After replacing the transformare between the speakers it not helped.
at this point , I plan to replace the other transformare resistors.
I removed the all 5 tweeters/squikers connectors (with the bias) and the protecting mode error stoped (of the bias protection).
new I can hear on high volumes but without the tweeter,
I found more errors like electrical noises from bios transformare , some nylone voice from the membrane.
and some electrical sparkles inside one of the woofers (or both) on vary high volumes that I tried.

Unfortunatly not having any mesh for one of the tweeters/squikers, have to find some to replace with+ 2pairs of mineral wool.

have to buy the repairing materials or buy a now tweeter/squizer.

*It workes much better on sony 1080 !

*Must to add a ground! to this system. even if it wont improve.

Click the image to open in full size.

Last edited by legopart; 6th August 2019 at 08:58 PM.
  Reply With Quote
Old 6th August 2019, 09:24 PM   #3
Zung is offline Zung  Switzerland
diyAudio Member
 
Join Date: Apr 2005
Location: Geneva
The ESL57's are some of the finest, most delicate speakers ever made, but they're NOT designed to play LOUD.

Download one of the various sound level apps for your phone, unless you have a real sound level meter. Even with the uncalibrated apps, if you're anywhere around 90dB, it's too LOUD for the Quad. And if you see sparks inside, congratulations, you've just fried your speakers.

Plus, the Quad's present a capacitive load and work best with top quality tube amp's. The abomination of an amp you pictured will NOT do; it may even oscillate and deep fry your speakers.
  Reply With Quote
Old 6th August 2019, 09:32 PM   #4
legopart is offline legopart
diyAudio Member
 
legopart's Avatar
 
Join Date: Oct 2016
Ok, I will test it later.
at this point I have only one tweeter not function well.
and some buzzing noise from the bias transformere.
planning to replace all the resistors, capacitors and diodes. only to get sure that all function good.

do you have some suggestion to replace the felt on the tweeter?

thanks.
  Reply With Quote
Old 6th August 2019, 09:44 PM   #5
Zung is offline Zung  Switzerland
diyAudio Member
 
Join Date: Apr 2005
Location: Geneva
I prefer the sound without the felt; I removed them long ago.
There's a lot of material on the Internet, notably from Sheldon who also contributes to this forum. I'd suggest you take your time and read them first.
  Reply With Quote
Old 7th August 2019, 01:55 AM   #6
stokessd is offline stokessd  United States
diyAudio Member
 
stokessd's Avatar
 
Join Date: Nov 2002
Location: Grantham, NH
It appears in the pictures above that there is a lot of RTV on the treble panel. That's not a good sign and I suspect that it has been damaged by overdriving it in the past. Then someone tried to isolate the damage by injecting it with RTV. I've seen this before in panels I've rebuilt. I suppose it might work for limited damage, but the amount and multiple locations you've got indicates some fairly extensive damage.

The amp is probably tripping the protection circuit when the treble panel arcs and the speaker appears like a near short to the amp.

The problem with treble panel damage is that the original damage forms a short path for future arcing and also a short for the bias supply. I suspect that you can hear humming through the bass panels as well due to the loading of the supply.


Sheldon
quadesl.com
  Reply With Quote
Old 7th August 2019, 11:16 PM   #7
legopart is offline legopart
diyAudio Member
 
legopart's Avatar
 
Join Date: Oct 2016
The "speakers input" resistence (the 1st tranformare helf) is only 1ohm.
Is it ok?
I though to add some fuse to protects the amp from short cyrcuit.
something like this 72V 0.25A Resettable Fuse Radial Lead PPTC Polyswitch 10Pcs 714998291073 | eBay
though about resistor, but it will take moust of the amp power to nothing.

Last edited by legopart; 7th August 2019 at 11:20 PM.
  Reply With Quote
Old 8th August 2019, 03:11 PM   #8
legopart is offline legopart
diyAudio Member
 
legopart's Avatar
 
Join Date: Oct 2016
I started from one transformare, disolder it and little bit colored it.
I plan to extend the cable for it and put it out side of the speaker, because it heavy and makes the speaker heavier!
Click the image to open in full size.
Click the image to open in full size.

I cant find any capacitors that will fit for the repairing the crossover,
I accidently destroyed the original pair:
Click the image to open in full size.

I cant find any replacemet for it: I need
1- 1120pF 4000v (2*560pF)
2- 560pF 4000v

I tried ebay and searched on the web and couldn't find any.
I found some other option for type of caps that I can connect them in serial
Click the image to open in full size.

The first option is to combine: 1000pF 10,000v MKT SIEMENS
1nF 10 000V 1 pcs * SIEMENS B32237A9102M000 MKT 1000 pF 10kV HV Tesla Coil Ham | eBay
1- 1000pF 10,000v
2- 500pF 20,000v (-||-||- 1000pF||1000pF each 10,000v)


The second option is to combine: 2200pF 2000v MKP10 WIMA
WIMA 2200PF 2000V MKP10 AUDIO Polyester Film Capacitors 4 pcs/ 10 pcs/ 20pcs | eBay
1- 1100pF 4000v (-||-||- 2200pF||2200pF each 2000v)
2- 550pF 8000v (-||-||-||-||- 2200pF||2200pF||2200pF||2200pF each 2000v)


What do you think about it?
  Reply With Quote
Old 12th August 2019, 07:06 PM   #9
legopart is offline legopart
diyAudio Member
 
legopart's Avatar
 
Join Date: Oct 2016
Searching for some shop for electronic parts.
In addition, I want the sound board with "Gas Discharge Tube "
I just dont know what to use
maybe CG3 like this one (little bit expensive)
Gas Discharge Tube (GDT), Low Capacitance, CG3 Series, 5 kV, Axial Leaded, 5 kA, | eBay
Click the image to open in full size.
And which zener-diodes can I use for the protecting board?
like this one
Click the image to open in full size.
*not my picture!

Still not got any answere about the caps on serial mod.

In addition, I found some source on the internet that dissapointed me, that this speakers works only up to 10,000hz

Last edited by legopart; 12th August 2019 at 07:24 PM.
  Reply With Quote
Old 12th August 2019, 09:17 PM   #10
legopart is offline legopart
diyAudio Member
 
legopart's Avatar
 
Join Date: Oct 2016
*my mistake, I have to choose only one protecting method.
  Reply With Quote

Reply


Have to fix my Quad ESL 57Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What Quad Colorado do I need: Quad 303 power amp XsamuraiX Solid State 4 11th October 2018 05:17 PM
(20) NSC/FSC MM74C00N DIP-14 Quad 2-Input NAND Gate . Quad Jimmy154 Swap Meet 0 4th May 2018 03:26 PM
RARE QUAD ESL57 ORIGINAL QUAD UK TREBLE PANELS - PAIR lampes Swap Meet 3 6th December 2012 10:02 PM
WTB: Any Quad II or Quad 22 units- working or not or parts for them hatrack71 Swap Meet 3 29th August 2010 03:46 PM
FS: Ei/Yugo KT90 quad, 6H30, svet KT88 quad - melbourne avian Swap Meet 9 15th April 2010 07:46 PM


New To Site? Need Help?

All times are GMT. The time now is 12:26 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki