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Old 10th Feb 2019, 4:43 pm   #33
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Capacitors for Trio 9R 59D

Opinions differ.

In my experience, it is a very poor engineering to connect a valve grid only to the slider of a pot for its DC connection. Pot sliders do not always make good contact, and with the tiniest amount of leakage or grid current, you get scratchy noises as you turn the pot. as it gets worse, scratches turn into crackles. In the worst case, pot sliders eventually go open circuit, leaving the valve with a floating grid, which is definitely a bad thing.

It is penny-pinching and unprofessional, though it usually seems alright for a time.

David
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