sony sa-h7900 one esl quieter please help - diyAudio
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Old 27th March 2013, 11:20 AM   #1
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Question sony sa-h7900 one esl quieter please help

Hi
I bought this machine with the symptoms like above,
please advice what usually causes that esl does work quiet?
is it because of dust, transformer, amp, or something?
It plays ~30% volume comparing to good one.
Sch is attached
thank you in advance for any suggestions
https://www.google.pl/search?q=sony+...w=1097&bih=567
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File Type: png sah7900.png (57.7 KB, 48 views)
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Old 27th March 2013, 01:14 PM   #2
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... someone has got similar troubles...
electrostatic tweeter repair Sony SA-EX100
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Old 27th March 2013, 02:30 PM   #3
WrineX is offline WrineX  Netherlands
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coating is screwed on one of the panels... most likly.

or it could be the amp that drives them. you can unscrew the front and swap the electrostatics with the other one , if the panels still plays softer on the other speaker. i bet its the coating.. i think you could easy get the panels appart as i remember and recoat them if needed.
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Old 27th March 2013, 02:37 PM   #4
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Question no recoating after opening - possible?

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Originally Posted by WrineX View Post
... and recoat them if needed.
thank you,
I am afraid of recoating
is this possible to unmount the speaker, check the coating and screw it again with old coating?
or after opening the coating is damaged and has to be recoated with new diaphragm?
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Old 27th March 2013, 02:59 PM   #5
WrineX is offline WrineX  Netherlands
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If i remember corectlly you can unscrew them and coat them without destroying the mylar.

but try swapping them first left for right and other way around. before doing any coating to know for sure its not the amplifier transformer or Highvoltage cascade.
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Old 27th March 2013, 03:48 PM   #6
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Quote:
Originally Posted by WrineX View Post
If i remember corectlly you can unscrew them and coat them without destroying the mylar.

but try swapping them first left for right and other way around. before doing any coating to know for sure its not the amplifier transformer or Highvoltage cascade.
thanks!
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