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Old 6th March 2010, 11:47 AM   #1
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Default Transformer for QUAD ESL57

Due to a house move I lost my quad esl 57 step up transformer. Does anyone have a broken ESL 57 speaker I could buy a step up transformer?

I have postal address in the Uk (My Parents) and Germany. If I had this part I would ship my old broken ESL's to Germany and try to get the lovely things running again.

Alternatively (because I have multiple quad 303's and 306's) I could go active on these speakers. Do people have suggestions for suppliers of treble and bass transformers that could do the job as well or better?

Quad no longer stock ESL 57 step up transformers, and the German supplier parts cost is too high considering the cost of broken quads in UK ebay (usually wont post even in UK).
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Old 6th March 2010, 12:45 PM   #2
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I can sell you an original step up transformer, contact me if interested.
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Old 17th April 2010, 02:17 AM   #3
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Dear Arend-Jan,

I have now received the transformer, thank you for your kind service.

Now I have to look at shipping the Quad ESL 57 speakers to Germany. I hope repairing my ESL 57's will be as pleasurable experience hearing them going again as I remembered from all these years ago, something that has made me think all magnetic coil speakers are inaccurate. The industrial 1950's radiator looks great even if the speakers do sound better without the metal grills if memory serves me right. I do remember them being big but light enough to move easily with a moderately convenient handle, which is important when you have limited space.
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Old 17th April 2010, 08:27 AM   #4
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I often heard people say that the Quad ESL sounds much better on a pedestal than on the floor. Maybe something you could try!

Kenneth
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Old 21st April 2010, 10:26 PM   #5
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Quote:
Originally Posted by kavermei View Post
I often heard people say that the Quad ESL sounds much better on a pedestal than on the floor. Maybe something you could try!
Thank you for the suggestion.

I have already tried it, and it is definitely true, but the bass output also goes down. Still I do feel that the Quad ESL 57 has magic in imaging and the presentation of acoustic music and not in its ability to play Dub reggae.
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Old 6th October 2010, 10:22 PM   #6
tmblack is offline tmblack  United Kingdom
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Is there a separate transformer for the woofer/midrange/tweeter sections or is it just one transfomer?
I haven't seen the ESL-57 crossover diagram, if someone has one that would be helpful.
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Old 6th October 2010, 10:42 PM   #7
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Quote:
Originally Posted by tmblack View Post
Is there a separate transformer for the woofer/midrange/tweeter sections or is it just one transfomer?
I haven't seen the ESL-57 crossover diagram, if someone has one that would be helpful.
Here it is: http://www.quadesl.com/pdf/quad_schematic.pdf
Thus just one transformer with several windings.
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Old 6th October 2010, 11:18 PM   #8
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Quote:
Originally Posted by tmblack View Post
Is there a separate transformer for the woofer/midrange/tweeter sections or is it just one transfomer?
I haven't seen the ESL-57 crossover diagram, if someone has one that would be helpful.

ESL57 uses one transformer core, but has separate secondary windings for the midrange/tweeter closely coupled to the primary and an additional set of secondary windings on the other leg of the core to provide the additional voltage step up needed for the woofer panels with their larger D/S spacing.
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File Type: jpg ESL57_schematic.jpg (58.8 KB, 402 views)
File Type: jpg ESL57_transformer_geometry.jpg (49.4 KB, 398 views)
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Old 7th October 2010, 01:43 AM   #9
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Lets see if I can attach this picture which is the inside view of a Quad ESL 57 step up transformer. I rebuilt thes some years ago. The outer cans were beat with some weld broken had them welded back together hammered them smooth filled the small dents with bondo and had them powder coated. Had access to a vacuum oven to remove and then replace the potting wax. They looked new again.
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File Type: jpg ESL_57_Trans _Pix.jpg (100.7 KB, 404 views)
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Last edited by moray james; 7th October 2010 at 01:47 AM.
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Old 7th October 2010, 06:27 AM   #10
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By the way I have one with broken wire. Does someone have details on how many turns & gauge for each winding ?
Is it do-able by hand or does it require a machine (if too many turns or needs to be very tight) ? Thanks
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