G, S, and P are, of course, Gold == 5%, Silver ==
10% and Plain ==
unspecified tolerance
If by "Plain" you mean "no fourth band", I thought that indicated
"20%", not "unspecified".
That's what I believe too.
-tony
'Unspecified' would leave a rather wide margin for the resistor
manufacturer.
I used to joke about why there's no tolerance band on 'zero ohm jumpers'
(short-circuit shunts built with the same package outline as a resistor,
often used in instances where a board-stuffing machine needs to put
*something* in a hole where a resistor might have gone. Usually they
have one black band in place of the regular 'resistance value' bands).
But what's the tolerance on a zero ohm jumper if it measures 20
milliohms on an accurate low-resistance bridge? (divide overflow)