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Most of those old resistors were 10% tolerance originally. Depending on the specific spot in the circuit, you may be able to vary this value pretty far without it mattering much. 3.9 ohms is awful low, whats it doing exactly? If you're not sure, maybe a schematic would be of assistance.
Also, unless the resistor is burned, or out of tolerance with the ohm meter, I wouldn't even bother with it. I actually use 20% as my personal guideline for replacement, and in many cases radios have been seen working with stuff way beyond 20%.
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Random bits of stuff in the collection:
Yamaha YP-D4 turntable with B&O MMC 10E cart
Allied 495 receiver
2 Magnavox amps, AMP150 and an AMP178, currently under the knife.
Onkyo TX-4500
Onkyo Radian III speakers
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