This is saying a 220k log b potentiometer for the tone pot VR8, correct? That is such an extremely odd value, but I don't see that sort of notation very often either and I wanted to make sure I'm not misinterpreting. Thanks!
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3B is a linear pot. A is log. – Eugene Sh. Jan 12 '18 at 16:44
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Can you add your comment as an answer so I can give you credit? Thanks! – Jonathan S. Fisher Jan 12 '18 at 16:45
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I don't have a reference, unfortunately. Without it the answer won't be credible. If I have one, I will add. – Eugene Sh. Jan 12 '18 at 16:46
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Now I have it. Check it out. – Eugene Sh. Jan 12 '18 at 16:56
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@EugeneSh. also on the wiki [page for pots](https://en.wikipedia.org/wiki/Potentiometer) under heading "Resistance–position relationship" – Tom Carpenter Jan 12 '18 at 16:57
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I think 220K is a rare value for a pot - 200K or 250K should be suitable substitutes. – Peter Bennett Jan 12 '18 at 17:38
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According to the table given on this page, "A" stands for logarithmic potentiometer (Audio), and B is standing for linear one (In Asia and America at least):
Eugene Sh.
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The taper goes by manufacturer, not country. Yes there are a typical schemes, but the manufacturer sets that label. – drtechno Jan 12 '18 at 22:58
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1I hate it when someone edits my posts, and gets it wrong... and I get negative marks because of it.... – drtechno Jan 13 '18 at 00:01