Yet another ESL57 rebuild

[ForsbackaKalle]

 

[ForsbackaKalle]

Will be fun to test those with some good ESL57s. Heres the first testrun with my workshop Fostex speakers. Works good

 

[Rick PA Stadel]

GORGeous ! Very nice work.

Cheers

 

[ForsbackaKalle]

I need to find a good material for dustcovers. Thin, not so much stretch and crimp ability and durable... any suggestions what to look for?

 

[wout31]

3 or 6 micron Mylar

 

[ForsbackaKalle]

This is new developed PCBs for audio transformer. One for upgrading old transformers to use over 15W and also new protection boards for treble panels. Both PCBs fit in existing screw-holes.

 

[ForsbackaKalle]

Did some panels yesterday evening. This suckers take a lot of my time. Need to replace the trough-hole plinth/turret boards with new ones sins the old ones broke. Found some ceramic ones I will fit

 

[Zung]

But it works....

I've been using this for quite a while, and I'm still breathing (I think).
Don't worry, be happy.

 

[ForsbackaKalle]

First sample of real handmade spiderleggs with same shape as orginal sides. Absolutely stunning quality. Just bolt on. Adjust listening vertical angle with center back-leg screw. Sins they are higher than orginal they are little less tilted but fully adjustable with back leg screw. Can be completely vertical and also fully tilted.
I have an fine carpenter by my close related. And we have a nice cooperation about this.

 

[Nemeske]

First sample of real handmade spiderleggs with same shape as orginal sides. Absolutely stunning quality. Just bolt on. Adjust listening vertical angle with center back-leg screw. Sins they are higher than orginal they are little less tilted but fully adjustable with back leg screw. Can be completely vertical and also fully tilted.
I have an fine carpenter by my close related. And we have a nice cooperation about this.

These looks gorgeous! I have only legs made out of mdf sheets cut out, but painted to match the overall theme of the speaker.

 

[ForsbackaKalle]

Did some work with EHT units yesterday. Melted wax and new diodes inserted.

 

[Zung]

The parts in the EHT do have their own sonic signatures.
I decided to roll my own. Check out my adventure here; the Gerber file is included.

 

[ForsbackaKalle]

The parts in the EHT do have their own sonic signatures.
I decided to roll my own. Check out my adventure here; the Gerber file is included.
View attachment 1115858

Interesting reading. The EHTs in my post is for a person who like it as original as possible. And I decided to just change diodes sins they can get leaky. What is the best caps to use do you think? Any link?

 

[Zung]

Polypropylene's, best compromise IMO, but they're much bigger than the original ceramics, hence the new PCB's.

 

[Fabien Lefebvre]

You can keep the original size by using 1 high voltage diode (4kV) iso 2.

https://esl.drakkapps.com/wp-content/uploads/2021/08/IMG_7310-768x576.png

 

[Zung]

Hi Fabien, how's your re-issue panels doing?

 

[stokessd]

I am skeptical that the power supply caps would make any difference due to the long time constant for charging the panels. But I'm willing to entertain that idea vs on the 63's where there is an air-gap between the HV supply and the panels.


Sheldon

 

[Fabien Lefebvre]

Hi Fabien, how's your re-issue panels doing?

Bass cell is fine. Treble cell is under construction. More tricky this one.

 

[ForsbackaKalle]

I am skeptical that the power supply caps would make any difference due to the long time constant for charging the panels. But I'm willing to entertain that idea vs on the 63's where there is an air-gap between the HV supply and the panels.


Sheldon

Agree with you Sheldon. I dont think it will do any difference sins if you unpower the panels they play with full power for a while...

 

[ForsbackaKalle]

I have done some more job on a friends ESLs. They do really perform well now. Not needed to open the cells this time.