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Unless I flunked math, .3 is ten percent of 3.0, which is usually standard practice. It varied from part to part, but electrlytics from that era could be half or double their printed value. Resistors could be ten to 20 percent off, five percent occasionally appeared. Smaller, non paper or electrolytic caps, such as ceramics, mylars, and micas could be 10 or 5 percent their stated value.
Given the age of the unit in question, if should be fine. If the original part was 10 %, the new part should be fine. Always check scematics. Usually they say all resistors and/or capacitors are 10% / 20% unless otherwise noted, in which case they are usually noted near the part on the page.
Last edited by Rod Beauvex; 05-23-2013 at 04:09 PM.
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