ESL57 audio transformer wiring

[Mgc3300]

Hi everyone , new poster here, I'm currently refurbishing some ESL 57's but I'm having difficulty identifying the post numbering on an early audio transformer(all the panel wires have been removed) The later type have the posts sequentially numbered 1-15 +earth post. With my early type there are 12 posts+ the earth and another 3 on a seperate board.I beleive these are not numered sequentially and I do not want to rewire incorrectly. I would be most grateful for any help.
Dave

 

[stokessd]

This is part of what you need, but doesn't get you quite all the way there:

http://quadesl.com/origRefs/quad_audio_wiring.pdf

That diagram post numbers don't exactly correspond to the schematic that floats around.

Here's te service manual that shows the circuit you have. I'll upload more if you are still needing it.

Quad ESL Factory Service Manual


Sheldon

 

[bolserst]

In case you hadn't already seen it, Sheldon's ESL57 repair manual is a great resource.
http://quadesl.com/origRefs/quad_book.pdf

Attached are some combined images from the book you may find helpful.
The first image is one I had numbered the posts of the modified 12 + 3 configuration you have to correspond with the later circuit.

The other 2 images are just the earlier 12 post and later 15 post configurations.

 

[Mgc3300]

Thats perfect!, that clears up the post numbering and the schematic clarifies what goes where. When it comes to wiring ',ve researced different opinions on what wire to use, currently I have 600v hook up wire 18 swg in the correct colours. Is this ok or should I be using a higher rating, I have 14 swg 10k for the EHT block.

 

[stokessd]

Thanks for the kind words about my old rebuild book. To anybody reading this in the future, that rebuild method is quite dated, and I've improved things a lot since I wrote that.

For wiring, you really need high voltage wire for the bass panels, especially the high voltage polarizing wire that goes from the power supply to the panels. I generally recommend re-using the factory wire if possible. The wires clean up pretty nice, as you can see from the picture below:

http://quadesl.com/diyaudio/IMG_6107.JPG

If the high voltage wire reuse isn't an option, I'd suggest that you use Pomona test lead wire. It is good to 10KV and is fairly inexpensive due to the fact that you don't have to buy a 1000ft spool:

Digikey link


Hope that helps,
Sheldon

 

[Mgc3300]

Thanks Sheldon, invaluable help. wire is on its way.

 

[stokessd]

In my experience, the 600v wire is fine for the treble panel, both signal and polarizing voltage. But you need the HV wire for the bass

Sheldon