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Old 21st Sep 2019, 11:13 am   #27
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
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Default Re: Philips BX281U20 valve radio

Quote:
Originally Posted by cdm1christopher View Post
The other cap electrolytic bypass is odd 100uf only reading 24.6uf and it's 12.5volt not come across that voltage rating before. Plus not marked +/- I'm assuming the black end of cap is negative as it's going to chasis ground
The black end that's connected to chassis will be +ve, the other end is connected to the bias supply which is -ve, the bias voltage is developed across R75 which has the current for all the valves flowing through it.

Lawrence.
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