i all, i recently acquired four Quad ESL 57 that i want to refurbish. Number one pair is´74 and second pair '75 according to the serials that i want to refurbish. Number one is being disassembled and cleaned. I have a question about the resistors that i will replace, found some on digikey but not totally sure which ones to by? I would appreciate links so i can get the wright parts.
Br. Elmar
Br. Elmar
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Schematic is here: https://www.quadesl.com/origRefs/quad_schematic.pdf
Further info is here: Transformer for QUAD ESL57
Further info is here: Transformer for QUAD ESL57
All these parts must be rated for unusually high voltages. Don't install any new parts
until you are absolutely certain they are suitable.
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I use the Vishay VR series of resistors for all the resistors in the original Quad ESL.
I use the VR68 for the crossovers:
VR68000001803JAC00 Vishay BC Components | Resistors | DigiKey
And I use the VR37's for the power supply front end.
Here's the data sheet on them:
http://www.vishay.com/docs/28907/vr25vr37vr68.pdf
I've also got some original ESL boards on my blog:
Sheldon’s World
Those boards are available for purchase directly from OSH Park.
Hope that helps,
Sheldon
quadesl.com
I use the VR68 for the crossovers:
VR68000001803JAC00 Vishay BC Components | Resistors | DigiKey
And I use the VR37's for the power supply front end.
Here's the data sheet on them:
http://www.vishay.com/docs/28907/vr25vr37vr68.pdf
I've also got some original ESL boards on my blog:
Sheldon’s World
Those boards are available for purchase directly from OSH Park.
Hope that helps,
Sheldon
quadesl.com
Thanks i will buy these, the first one has no damage on the membranes so i will just clean them and and replace the resistors for now. I did not plug it in and test it before i dismantled it.
Shared album - Elmar Benediktsson - Google Photos
Shared album - Elmar Benediktsson - Google Photos
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Make sure you install the protection boards to save your mid/tweeter panels from arcing
It is sonically transparent as well
Regards
David
It is sonically transparent as well
Regards
David
I just read the thread from earlier, and have been looking for appropriate 560pf caps. (I already ordered some inappropriate ones.) I found some, ranging up to $90 ... each. I know they have to be high-voltage caps, but does anyone have specific recommendations?
Yes i will build the protection board from Sheldon's site.
Sheldon’s World >> Blog Archive >> Original Quad ESL Treble Protection Boards
Melted the beeswax from nr one EHT unit whith a hot air gun for eletronic bord work nice results.
Br Elmar
The boards are available from OSH Park:
OSH Park ~
Sadly they are purple, but that's their only problem 🙂
Sheldon
I haven't found a completely satisfactory solution. I generally keep the caps and replace the resistors, because I am of the (nonscientific) belief that the caps are part of the voicing and magic of the speaker. You can put a highish voltage 1200pf and a 1000pf film cap in series and make a 550pf cap that way.
I keep meaning to call Illinois Cap and ask about the cost of a run of 560 pf 4kv film caps.
Sheldon
for all the bass panel wiring, I use this:
6733-0 Pomona Electronics | Cables, Wires | DigiKey
Sheldon
6733-0 Pomona Electronics | Cables, Wires | DigiKey
Sheldon
I ordered this type of cables
12M 18AWG 10KV Electric Copper Core Flexible Silicone Wire Cable Red for RC | eBay
15M Length 18AWG 10KV Electric Copper Core Flexible Silicone Wire Cable White | eBay
18AWG 10KV silicone Copper (Tin Plated)
Red+White
also got 20AWG 6KV silicone Copper (Tin Plated) RED+WHITE+BLACK
From ERAudio restoring kit
your suggestion looks really good (18AWG 10KV silicone Copper) [15M]
6733-0 Pomona Electronics | Cables, Wires | DigiKey
6733-2 Pomona Electronics | Cables, Wires | DigiKey
Black and Red
but I think that even with my passion to idialism, I not gonna by some.
and you know that I much happier when I made even the most shitty crossover with WIMA MKP10 Cap 😀
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