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Old 14th Sep 2021, 10:53 am   #23
stevehertz
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Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 8,833
Default Re: Bush DAC90A can't get tuning knob off

Hum can be main smoothing caps need replacing. Otherwise either test or replace valves one by one with known good ones.
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