Salvaged component: Mojo or useless junk?

[frokost]

Picked up a strange device on a flea market. Got four ge trannies and these from it:


What are they? Ceramic capacitors?

[frequencycentral]

Mojo for sure - but I have not the faintest idea what they are..........

[R.G.]

Ceramic caps or thermistors.

Hey! Here's an idea - use your DMM to measure them!

[Ice-9]

they look like old caps, they used to be colour coded like that to get the value, (similar way of colour coding for resistors)

[frokost]

Well, my DMM isn't fancy enough to measure capacitance, and since I first assumed that they were capacitors I didn't bother to measure them. Tried it now, and they give a reasonable stable reading of about 1.3M and 300K of resistance, which makes me think they are thermistors. Darn.

[petemoore]

Well, my DMM isn't fancy enough to measure capacitance, and since I first assumed that they were capacitors I didn't bother to measure them.
  They look like caps to me, but I dunno for sure.
  Your DMM measures DC, caps block DC, set up a small DC voltage, see if it is blocked across the capacitor...measure DC on one side, not on the other, like in an input cap position.
  Tried it now, and they give a reasonable stable reading of about 1.3M and 300K of resistance, which makes me think they are thermistors. Darn.

[frokost]

Still a little bit of a mystery, this.. Did what petemoore suggested and read 2 millivolts on the other side. Leaky cap? Or a sideeffect of ceramic caps being bad for blocking DC? I tried to measure resistance once again and one of the caps' resistance went up and up and up until the DMM couldn't read it anymore.

Guess I'll just have to pop them into a circuit and see what happens. I hope they are caps, because then I can use them in my All-Mojo East Germany Fuzz Face  .

[petemoore]

  Pop in the circuit is what I do, but I've always been able to recognize what I'm putting in as caps first.
  Most of the time that can help me better decipher cryptic code markings, at least give me a 'nano/Pico/micro farad?' ballpark value estimate.
  DC blocking ability is the only other DMM style trick I know of to determine...if they're DC blocking.
  I remember caps always passing nilch-ish DC current as far as what a DMM would say..
  Compare readings to what other capacitors read on the DMM.

[Ice-9]

I'm prettysure they look like caps. here is a cap colour calc , maybe itwill help identify if they are caps or thermistors

http://www.csgnetwork.com/capcccalc.html

[frokost]

Thanks, everybody. Now I'm thinking they're caps, ahem  . According to that calculator, they are 500pF and 300pF 100V caps. I was hoping they would be large enough to use as output cap in a fuzz face, since I plan to at least try to use the trannies in one, just for the hell of it. Thought maybe they would be big enough too, since the thingie I pulled them out of seemed like some sort of power application or something. I have thrown it away now, but there was a motor, some springs, the trannies and these - nothing else. I have no idea what it was.

Really. I'm not into mojo at all, but they look cool, don't they?

[Ice-9]

from the calculator i get 40n and 50n

[frokost]

I did too, when trying such a calculator, but then I stumbled upon this image: http://vintageradio.me.uk/info/constructors_datasheet/capacitor_colour_code1.jpg which gave me another story. The smaller values seem a little bit more plausible with these small and old ceramics too, I think. If that's what they are.