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OT's 'widget' schematics for the ESL57
OT's 'widget' schematics for the ESL57
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Old 10th December 2017, 12:01 PM   #1
Nemeske is offline Nemeske  Hungary
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Default OT's 'widget' schematics for the ESL57

Dear Forum,

I do not know if it's O.K. to ask it here, but do anybody knows the schematics for One Thing Audio's "widget" for the ESL 57?
Who knows its purpose?
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Old 12th December 2017, 02:04 AM   #2
stokessd is offline stokessd  United States
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I have no idea, where is it placed in the circuit, that might give a clue as to what's inside of it.
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Old 12th December 2017, 09:56 AM   #3
lcsaszar is offline lcsaszar  Hungary
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What I could make out from OTAs description is that the widget makes an easy load for the amplifier. Some amplifiers do not tolerate the low impedance of the ESL exhibiting at high frequency, and could become instable. How is this impedance correction achived, I have no idea. But I can live without it
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Old 12th December 2017, 10:12 AM   #4
Nemeske is offline Nemeske  Hungary
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Quote:
Originally Posted by stokessd View Post
I have no idea, where is it placed in the circuit, that might give a clue as to what's inside of it.
It puts between the amplifier and the transformer's input
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File Type: jpeg image.jpeg (49.0 KB, 149 views)
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Old 13th December 2017, 04:07 PM   #5
Nemeske is offline Nemeske  Hungary
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Quote:
Originally Posted by lcsaszar View Post
What I could make out from OTAs description is that the widget makes an easy load for the amplifier. Some amplifiers do not tolerate the low impedance of the ESL exhibiting at high frequency, and could become instable. How is this impedance correction achived, I have no idea. But I can live without it

My plan is to experiment with other amp than the Dynaco ST70
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Old 6th January 2018, 04:29 PM   #6
bolserst is offline bolserst  United States
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Quote:
Originally Posted by stokessd View Post
I have no idea, where is it placed in the circuit, that might give a clue as to what's inside of it.
From pics and descriptions posted on their website: One Thing Audio
  • The ESL-63 widget appears to be intended as a replacement for the RC input components.
  • The ESL-57 widget is likely designed to be placed at the input as well, but component values and PCB traces are not definitively discernible in the pic.
    With carefully selected R & C values some equalization(mentioned in the description) of the slightly sloping response of the ESL-57 should be possible.
Attached Images
File Type: png ESL63_RCinput.png (651.4 KB, 69 views)
File Type: png Widget_ESL63.png (295.4 KB, 64 views)
File Type: png Widget_ESL57.png (232.1 KB, 63 views)
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Old 13th January 2018, 08:49 AM   #7
Nemeske is offline Nemeske  Hungary
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Thank you for your time!


Quote:
Originally Posted by bolserst View Post
From pics and descriptions posted on their website: One Thing Audio
  • The ESL-63 widget appears to be intended as a replacement for the RC input components.
  • The ESL-57 widget is likely designed to be placed at the input as well, but component values and PCB traces are not definitively discernible in the pic.
    With carefully selected R & C values some equalization(mentioned in the description) of the slightly sloping response of the ESL-57 should be possible.
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