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Also if the 4th tolerance band exists; base the acceptable tolerance on that. Usually on 60's color sets the majority of resistors will be 10% silver bands with some 5% gold for critical apps and some 20% no-4th-band resistors thrown in non-critical areas for cost savings.
If a gold band checks within 10-20% but not in it's designed 5% and you leave it, then you just missed a failed component...
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