Help identify this type of capacitor-Need Upgrading?

[craigmorris74]

Below is a picture of an EQ that I'm considering for use in my mixing setup.  I was wondering what type of capacitors these were (film, ceramic?).  They aren't marked with any brand name.  If they were ceramic I probably will change them for some nice film caps.  Sorry the pic is so blurry.

 

[Davo]

If your're talking about the large yellow ones, they're probably polyester... and they're probably just fine... I wouldn't touch em
If it's the little yellow ones... ceramics... but they're sitting off of some opamps, so probably feedback caps, leave em.

cheers,
dave

 

[zebra50]

The little yellow ones may also be tantalums - in that case they should have a little polarity sign - often a "+".

The black round one is of course an electrolytic.

 

[craigmorris74]

Sorry, was the rectangular yellow ones I was concerned with.  Polyester will be fine, just wanted some film type there.  The high band has two ceramics, and those will have to go.

Thanks for the help,
Craig

 

[mikeyB]

Yep - big box yellows are polyester film - unless the unit has been abused these should still be good.
Little yellows look like X7R or Poorer Z5U multilayer ceramics - often see these as feedback caps across output and -ve input of opamps - they`re to tame hf oscillation. What`s the opamps - dual? They look adjacent to middle 2 pins - test with continuity meter - i,m guessing across pins 6 and 7. Opamps often have 100n X7R`s to decouple the supply rails - pin 4 to 0v and pin 8 to 0v if it`s a dual opamp.