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Old 21st Apr 2017, 6:19 pm   #2
Cobaltblue
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Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
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Default Re: Bush DAC 90A Conversion

On the DAC90 the volume control is on the grid of the UBC41 which also contains the detector diode and AGC.

My guess the unloaded detector is inducing the signal perhaps via the cathode onto the triode.

Cheers

Mike T
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