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Old 4th July 2013, 08:11 AM   #11
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Quote:
Originally Posted by AVWERK View Post
Google Sheldon Stokes

Look for Quad protection


Regards
David
Hi David

Thanks for the tip, based on it I found this LINK to a .PDF. Sadly, I am not entirely clear what it means; scrub that, I am not at ALL clear what it means .

I suspect that the top image describes the stock Quad clamp board and the lower one describes Sheldon's alternative. I can see that it is only used in relation to the tweeter panels but I don't really know quite where it is installed?
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Old 4th July 2013, 06:13 PM   #12
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sounds like you are at a bit of a loss. Question for you. Are your Quads stock? If the answer is yes I think that you should do yourself a favour and stop wasting time and money. Find the closest professional re builder and have your Quads rebuilt you can have protection installed at the same time. If stock your speakers are very old and they are falling apart and I don't care how good people say their stock Quads sound they need to be rebuilt and you will not be disappointed. Start here QUAD ESL 57 repair and refurbishment Best regards Moray James.
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Old 6th July 2013, 05:18 PM   #13
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Don't just run out and blindly rebuild your quad 57's. The return on investment isn't always great. If you panels are in bad shape, then the difference can be striking, but for panels in good shape, the differences should be minor at best. Unless your rebuilder is not staying true to the original panel performance.


Sheldon
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Old 7th July 2013, 07:41 AM   #14
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Originally Posted by stokessd View Post
Don't just run out and blindly rebuild your quad 57's. The return on investment isn't always great. If you panels are in bad shape, then the difference can be striking, but for panels in good shape, the differences should be minor at best. Unless your rebuilder is not staying true to the original panel performance.
Sheldon
I took statistics on a couple of hundred sets and they all showed the following symptoms:

* loss in sensitivity of 2 to 5 dB
* loss of low frequency reproduction due to raised Fres of the bass panels

Those two are more or less a given. I even tested a set once that came new out of the (unopened!) box and it showed the same symptoms only to a lesser degree. That being said on rare occasion there are sets that still play very well indeed. Quite amazing considering their age!
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Old 8th July 2013, 12:36 PM   #15
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Quote:
Originally Posted by moray james View Post
sounds like you are at a bit of a loss. Question for you. Are your Quads stock? If the answer is yes I think that you should do yourself a favour and stop wasting time and money. Find the closest professional re builder and have your Quads rebuilt you can have protection installed at the same time. If stock your speakers are very old and they are falling apart and I don't care how good people say their stock Quads sound they need to be rebuilt and you will not be disappointed. Start here QUAD ESL 57 repair and refurbishment Best regards Moray James.
My ESL-57s ARE stock.
I AM at a loss.
I AM trying to avoid wasting money.

My question related JUST to "clamp boards". Since I am trying to avoid wasting money I am reluctant to spend some 2,000 on refurbishing my speakers even if it does happen to include clamp boards.

I accept that a complete rebuild would make a difference to my 45 year old speakers, I am not entirely convinced that I would really notice the difference. I don't want to damage them by overdriving them - seems to me to be a reasonable, sensible precaution?
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Old 9th July 2013, 12:26 AM   #16
RNMarsh is offline RNMarsh  United States
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You wont arc them over and burn the film's coating away IF you stay under 30 W power amp.

-Richard Marsh
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Old 10th July 2013, 07:41 AM   #17
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Quote:
Originally Posted by stokessd View Post
Don't just run out and blindly rebuild your quad 57's. The return on investment isn't always great. If you panels are in bad shape, then the difference can be striking, but for panels in good shape, the differences should be minor at best. Unless your rebuilder is not staying true to the original panel performance.

Sheldon
Pretty much what I had suspected, thanks. As it happens, the speakers seem to be in very good condition with a beautiful sound - except that the aluminium mesh on the front has a few "dings" in it (from careless storage), the wooden side cheeks have a few scratches and the legs have gone missing.


Quote:
Originally Posted by RNMarsh View Post
You wont arc them over and burn the film's coating away IF you stay under 30 W power amp.

-Richard Marsh
As it happens, I am currently using a Ferrograph F307 Mk II (20 Watts max.). However, as I understand it, the ESL 57s are somewhat tricky to drive and so I do plan eventually to use a Quad 33/303 - I will keep the volume fairly low.


Thanks for all the useful replies, they are much appreciated.
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