The heck is this?!?

[GadgetBoy]

Pinkish resistor with red, red, gold, gold, white (or vice versa - doesn't make sense either way).

Any thoughts?

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[Housedad]

I ddon't know a lot, but my best first guess would be some kind of old axial lead capacitor.  Paper wound.   But the board says R10.  Makes no sense.

If you have a ESR meter you may want to try it and then see what the DC resistance  (and continuity) of the part to help find out.

What is this in?

[tooki]

I think the pink denotes a fusible resistor. (As in, not all fusible resistors are pink, but if a resistor is pink, there's a decent chance it's fusible.)

[floobydust]

The first four bands are the usual IEC: red red gold gold = 2 2 x0.1 ±5% gives 2R2 ±5%.

The fifth band is open season, unfortunately (resistor) manufacturer specific.
These have a safety function because they burn up when something else fails short circuit.
It would be a flame-proof fusible resistor. But I am not sure who made it, i.e. Yageo, KOA, Welwyn, TT, Futaba etc.

Fifth band:

White: fusible
Gold: miniature fusible (usually with pink body)
Yellow: "constant voltage fusibility"
Black: sometimes wirewound fusible resistor, but I see film types too
Violet: Vishay NFR25H

Some series use coloured fifth band to denote fusibility overload rating (4x,8x,64x).

[xrunner]

Or use the brute force method - unsolder one end and get to it with a DMM ... 

[Housedad]

Oh, I see what you mean.  The 5th white band is confusing, leading to believe it is a 5 band when it is only meaningful to the manufacturer and not standard code?

So a 4 band with a junk band at the end.  Sounds like a bad concert.

I'll always call them "bad concert" resistors after this.

[drussell]

Various manufacturers use the lacquer color on the body to denote different series / material technology but there is no industry standard.  Ditto for things like that fifth band, it often denotes special series or characteristics / options.  You would need to know the manufacturer to be able to decypher a particular code with absolute accuracy.

For example, Yaego FKN and PNP series both have green bodies, in this case denoting Wirewound construction.  The PNP series has a violet 5th band, denoting "High Power, Ultra Miniature" type while the FKN series has a white 5th band, denoting "Fusible & Flame Proof, Normal and Mini."  In the case of the FMP series, the pink body denotes Metal Film construction, etc. etc. 

There are a virtually limitless number of permutations and combinations even among the various series available from a given manufacturer.  For example, in addition to the note "The resistors are coated with layers of green color flame-proof lacquer," the FKN series datasheet shows:



Datasheets: Yaego FKN series, Yaego PNP series, Yaego FMP series

[T3sl4co1l]

Other evidence aside, it's placed suspiciously close to -- probably in series with, a quick look at the solder side will prove this -- an AC line, which if that's mains, and there's no fuse in sight... doing double duty for inrush limiting and fusing is not at all a bad guess.

Tim