What's this part???

[Thomas P.]

A cap? I've never seen one like this before.
The reading is pretty hard, it says:
M 1n0AY (propably 1nF)
250~Y1
140~X1

[sir_modulus]

looks either like a tantalum (except those are more shiny) or a really deformed egg-head ceramic. I'm leaning more towards the second here. I've seen some like that (here's an issue where I have some experiance as my school has reeeeeal old parts the I *analyse* by putting  them in circuits that I never return) though those are very rare.

Edit: Is it shiny?

[bioroids]

I've seen tantalums electrolitics looking like that.
It should have a + sign somewhere, though

Luck

Miguel

[petemoore]

I have a FF on board for just such occasions.
 I just take the unknown cap and stick it in the input cap position of the FF...that way I can tell [pretty close by ear] what the uf value is.
 I'ts my own little EZ cap value 'ballparker'...usually between the markings and the test I can tell the value of a cap....er I think...

[Lonestarjohnny]

I got a bunch of those old cap's, mine are different in color but are shaped like the one you show, I think they may have been called Dipped Monolithic cap's,not sure on that though, i know the 1's i have use color band's to designate the value,  Pete Traynor used these in the EQ section on a lot of his amp's and i have traded these out for ceramic and lost a lot of the mojo of the tone circuit, i have learned to leave them alone now if they are close to stock value, they do make good tone when used in the tone stack.
Johnny

[Thomas P.]

I#m pretty sure it isn't a tantalum since it's neither shiny nor polarized. Since it got markings like Y1 etc I thought it could be a cap for supressing RI in power-supplys.

[toneman]

looks liked "dipped" ceramic 2 me.
almost all tantalums are polarized.
this doesn't have any polarity symbols.
afn
t

[phillip]

Yep that's a ceramic.  Back when I started building effects pedals I got some small ceramic caps in a blister pack from radio shack that looked just like those, except they were a dark red color.

Phillip