capacitor type identification??

[karma67]

hi,
having just recapped my early ditton 44's id like to do the later type which have a circuit board type crossover,i know the early hard wired board uses metalised/polys for the mid and tweeter caps so im guessing its the same for the later board? the caps are erie .
any help guys,they are the green ones in the pics below.

[Firebottle]

I would guess they were polyster but that's just a guess.

Would be very interesting to know if anyone does know for sure.

[Colin Wonfor]

Some in this style are Ceramic or even AgMica (green ones)
The others are bipolar electrolytics.

[Arkless Electronics]

Polyester or polycarbonate for sure but which is another matter.... They have similar properties either way and polypropylene would be a slight improvement over either with no negatives.

[karma67]

Thanks,I thought polys would be ok but better to check first.

[337alant]

I would change all the Elcaps for Ansar Supersounds as well

Alan

[karma67]

I'm using alcaps for those, like for like.

[karma67]

Polyester or polycarbonate for sure but which is another matter.... They have similar properties either way and polypropylene would be a slight improvement over either with no negatives.

ive just been reading up on the life span of these and by all accounts its only really necessary to change the electrolytics ,im gonna leave these in place and see how the speakers sound.
what do you think?

[Reffc]

No need to change polyesters or polypropylenes as their life span will be many decades at the dtuies they operate under. I would only replace them if they are wide tolerance versions (which was often the case when a typical cap would be considered good at 10%!). The others will be shot by now as with most electrolytic types of that age and almost certainly would exhibit raised ESR. As they are cheap to replace, I'd just replace those. I tend to use Mundorf or Alcaps. Both are cheap as chips.