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Make your speakers sing again

You can try to repair your ESL yourself by using  repair/upgrade materials like our VLC (very low conductivity) coating

  • VLC coating liquid.

    There are three different types of coating available:

     

    VLC11 -->   R > ~10E10-12

    VLC09  -->  R > ~10E8-10

    VLC07  -->  R > ~10E-6-8

    Have a look a the application manual with much more technical informations.

 

Measuring surface resisitivity. Above: By ring probe and Milli-TO2. Below : By Keithley resistivity adaptor and picoA source

 

 

  • and diverse kinds an brands  of PE and PP foil from 3µ to 25µ. One side treated ones and metalized ones. Have a look at our catalogue.

 

Easy but effective way for DIYers - not having a special gauge or adjustable stretching jig-  to adjust the diaphragms' tension.

Simply place a known weight, equivalent to the original foil's tension,  on the new  diaphragm to be stretched. Stretch until the weight begins to hover (place a piece of felt as shield beneath the weight for not hurting the film).

By this way one will get very close enough to the original values. The weight should have a vertical shape, so you very early realize the correct tension because of the weight beginning to wobble. But do not forget  to measure at multiple points of the area for getting an evenly stretched diaphragm!

INFO: You can also realize the correct mechanical tension of a single ESL63 panel by simply measuring its acoustical resonance frequency by using  your PC's audio card even with a very primitive microphone of any kind.

 

Capacity of the panels.
Insulation resistivity

You can test the correct repair of your ESL panels by measuring the capacity. E.g. an ESL57 MHT panel should have a plate to plate capacity of about 50pF. The capacity plate to diaphragm is about 30pF. The bass panel has 250pF plate to plate and 125pF plate to diaphragm. Plate  to plate and plate to diaphragm insulation resistance should show at least more than 10E10 Ohms.

Glue , tapes and adhesive

  • We also have the probably most adequate modern industrial power adhesive for everlasting gluing of polyolefines like Polyester and Polypropylene, as well as the most perfect stretching tape

 

Have a look at our catalogue site for more information on these materials.

 

 

New EHT/HV wiring and connecting

 



We have 10kv to 20kV flexible wire for banning all leakage of EHT and high-voltage NF transformer output. As well as HV insulated connector points to the ESL57 panels

A must for the ultimate refurbishing of your ESL speakers

 

 

Available Spare  Parts for Quad ESL63


ESL63 Grill cloth in diverse colours

ESL63 Vertical stiffeners

ESL63 the metal grills itself

Spare  stepup transformers

QUAD ESL63 stands

Dust cover frames

 

Right now we have in stock   3 pairs of fully refurbished QUAD ESL63

Please  ask for a quote for the above items

 

 

Some practical repair/refurbish hints for  DIYers

  • ESL EHT contact area tools for all single/twice point polarisation/bias voltage connected ESL diaphragms/membranes, e.g. B&W DM70 or Shackman ESL-MHT85/ESLAB

 

This tool consist of a conductive double sided sticky tape  and a one side gold metallized foil with a high- ohmic coating on the opposite side. !Not for practical use with  Quad ESL63. But the better for Quad ESL57, no corroding anymore!

 

 

Using these tools will result in a permanently non-corroding, ever lasting  EHT HV contact. N.B.: These tools are part of our "Coating Liquid" offer.

 

 

Quad ESL-63 Dust Cover Fixing/Installation for DIYers

One of the questions for the Quad ESL diy-refurbisher. What film to use and how to correctly apply it??

The best dust cover foil will surely be Polypropylene. All experts will agree  because of its almost resonance free  acoustical properties. That is why we are strictly using 3µ Hoechst PHD Polypropylene foil as a modification to the original Quad dustcover foil. We are doing so for the ESL63 as well as for the ESL57 types (the bass panels get a 6µ dust cover) , with extraordinary results compared to the former original foil. But to customers specification we can install the original dust cover as well. Make your choice.

There are several possible ways to stretch the ESL63 dust cover to the frame. Below you see some pictures of our kind of the procedure. It is safe, reliable and easy to do.

 

Double sided sticky tape around the dust cover frame. Removing the protecting paper and simply turning the frame up side down with the sticky side to the prepared film.

Slowly and safely cutting the foil with a solder iron or knife.

The total frame with film ready to be "clipped"

The frame is about to be clipped to the main frame after safely putting the total unit from left to right behind the vertical aluminum stiffeners

Ready, absolutely and permanently wrinkle free after correct heat gun shrinking at 164°C (+/-2°).

 

High Voltage wiring of the ESL panels

 

How to get a precise Mechanical Stretching of an ESL foil without a gauge

 

Easy but effective way for DIYers - not having a special gauge - to adjust the diaphragms' tension. Simply place a known weight, equivalent to the original foil's tension,  on the new  diaphragm to be stretched. Stretch until the weight begins to hover. By this way one will get very close enough to the original values. But you have to verify the correct tension on multiple points of the diaphragm area.

 

INFO: You can also realize the correct mechanical tension of a single ESL63 panel by simply measuring its acoustical resonance frequency by using  your PC's audio card even with a very primitive microphone of any kind.