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Old 10th Apr 2019, 8:31 am   #4
Lucien Nunes
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Join Date: Apr 2008
Location: London, UK.
Posts: 2,508
Default Re: Replacement Caps

Up, generally. In many applications, such as HT decoupling and signal coupling, the capacitor simply has to be large enough to do the job. For economy the manufacturers will have used the smallest value meeting the requirements. A significant increase won't make any difference except size and cost, whereas a significant decrease might affect performance. The main exception is the HT reservoir, where using a vastly oversize cap can stress the rectifier.

In tuned circuits the actual value is critical, however the original caps are more likely to be mica or ceramic and probably won't need replacing anyway.
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