JBL Paper wrapped capacitor filled with wax -- what type cap is it?

[jfine]

Acquired a pair of L300's, these have 3 caps that are wax filled, wrapped with a cardboardy-paper.

I saw the thread where someone rebuilt these, and other people have just replaced them.

But what kind of cap is it inside there? Film?

I know JBL in this era used metal NP's on some models, yellow mylars on lots of models, L300 included, but if the wax caps are film, then they should still spec fairly well, like the mylars do.

[mech986]

Acquired a pair of L300's, these have 3 caps that are wax filled, wrapped with a cardboardy-paper.

I saw the thread where someone rebuilt these, and other people have just replaced them.

But what kind of cap is it inside there? Film?

I know JBL in this era used metal NP's on some models, yellow mylars on lots of models, L300 included, but if the wax caps are film, then they should still spec fairly well, like the mylars do.

I believe they are mylars encased in the wax & paper shell, but now really old mylars. I'd still suggest replacing them with some fresh polypropylenes.

[jfine]

Hmm, mylars inside eh? It looks like just some foil wrapped around something,

http://www.audioheritage.org/vbullet...l=1#post320369

I guess it's just paper,

http://en.wikipedia.org/wiki/Types_of_capacitor

I do not want polypropylenes, I would like to find a more direct replacement (not visually, functionally), IF I decide to replace.

[hjames]

Okay, the Schematic of your L300 crossover is here -
http://manuals.harman.com/JBL/HOM/Te...ummit%20ts.pdf

Just replace the caps in question with whatever kind of caps you prefer, just match the existing values.

Hmm, mylars inside eh? It looks like just some foil wrapped around something,

http://www.audioheritage.org/vbullet...l=1#post320369

I guess it's just paper,

http://en.wikipedia.org/wiki/Types_of_capacitor

I do not want polypropylenes, I would like to find a more direct replacement (not visually, functionally), IF I decide to replace.

[NickH]

Okay, the Schematic of your L300 crossover is here -
http://manuals.harman.com/JBL/HOM/Te... Summit ts.pdf

Just replace the caps in question with whatever kind of caps you prefer, just match the existing values.

Voltage can be higher on a new cap, but nont lower. And take into account the tolerance of the old and new cap.

[jfine]

Okay, the Schematic of your L300 crossover is here -
http://manuals.harman.com/JBL/HOM/Te... Summit ts.pdf

Just replace the caps in question with whatever kind of caps you prefer, just match the existing values.

I have the schematic, I know I can put whatever I want in there, but my question remains:

What type of cap is it? Must be a mystery!

[hjames]

I have the schematic, I know I can put whatever I want in there, but my question remains:

What type of cap is it? Must be a mystery!

Who cares, its an old cap that was figured at a certain price point, and is long beyond its expected lifetime ...
Use it, or replace the caps in question with whatever kind of caps you prefer, just match the existing values,
and like the man says, voltage can be higher, but never lower ....