On 09/27/2015 02:05 PM, Noel Chiappa wrote: Yup, that's a glass-encapsulated multi-layer ceramic cap, 0.1 uF value. It is definitely non-polarized. I did see these at one time, I think they were to make the ceramic caps more durable. They are basically the same as an SMT multilayer ceramic that would be used today, but in an axial lead format. Jon

On Sun, 27 Sep 2015, Noel Chiappa wrote: These are hermetically sealed ceramic and are non-polarized. The glass encapsulation made them more expensive so they were usually only used in high reliability, aerospace, military, etc type applications. There are also similar sized axial ceramics which are epoxy dipped which are not hermetically sealed. One downside is like glass encapsulated diodes, you have to be careful to support their leads at the capacitor's body while forming to avoid cracking their glass shell. Also like with glass encapsulated diodes, they should be covered with clear heatshrink if the board will be conformal coated. As for wound foil capacitor types, they sort of have polarity. In audio and other noise sensitive applications, the outside foil end of the capacitor should be connected to ground or the lower potential side of the circuit. You also can't go by the black band printed on new manufacture parts as it does not actually indicate the outside foil end (they are printed randomly). When I briefly mentioned these before, someone pointed me to this video which goes into more detail. https://www.youtube.com/watch?v=BnR_DLd1PDI