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Old 6th Mar 2021, 11:13 pm   #9
buggies
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Join Date: Jan 2009
Location: West Lothian, UK.
Posts: 762
Default Re: Any suggestions on treble issue on a Cambridge A5 amp reignited after 20 years?

How about using a PC?
Bung 10kHz into the amplifier and look at the variation of the output as treble control varied.
This program (for example) has an audio generator and 'scope:-
https://www.zeitnitz.eu/scope_en
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