CBB film capacitors; what exactly are they??

[hymenoptera]

I've been sourcing certain film caps for various projects from some far east vendors, and one thing I keep seeing is "CBB" in the listings. Does anyone know what this means? I've seen it on many of these large value / small form factor films I like to use.

Most of them have been dark red in color, like the Panasonic/Matsushita ECQ clones that are so common, so I figured at first it must be a brand name, but then I noticed some orange Philips-clone films with that designation. I had read somewhere that it meant polypropylene, but most recently I bought some "polypropylene" 250v 1uF 5% caps from ebay vendor "good4deal99" that are certainly NOT what they claim, with a "105K" printed on them, but with values measuring 1.06 to 1.15uF they are certainly factory rejects and at their size cannot possibly be 250v PP, more than likely 50v or 63v PE (mylar/dacron) instead. Is CCB something desirable that's worth lying about?

So far I'm happy with the results I'm getting, and they all sound fine to my ears, so I plan to keep buying them. My best scores so far have been from a vendor in Shanghai called "tescomalls" who has some nice 5% films in small sizes / large values on ammo tape for a good price. Perfect for pedals. I tried swapping the 1uF coupling caps in a breadboarded RAT with the Panasonic ECQ which look almost identical and could hear no difference between the two.

Anyways, does anyone know what CBB stands for, or if it implies some standard or some specific manufacturing process or something?

Any help would be appreciated.

[italianguy63]

I think it is a brand name.  I was looking for some (caps) that looked like the old-school Panasonics.  These really fit the bill.  I have no complaints with them, and they are quite inexpensive too.  I purchased some mylar caps from Tayda, and I have had these subsituted in from time to time.  I would guess they are basically mylar chicklets.

MC

[hymenoptera]

Yeah most of them I've received look like greenies, but they're dark red. I've gotten green chiclets from Tayda, but not the red ones. There's probably no difference I would think.

[italianguy63]

I've only had the red ones come in from Tayda on some strange value(s).  Not often.

MC

[hymenoptera]

The 0.56uF and 0.82uF 100v 5% Polyester Mylar films Tayda is shipping now are the red ones because I just got some in last week and I'm finally getting around to putting them away. The picture on the website shows the tall/skinny green chiclets.

The Tayda ones are shorter and fatter than the ones from the "tescomalls" 'bay vendor, but either should fit great in pedals as coupling caps, etc. So far they all seem to have the same 5mm lead pitch spacing.

Tayda does not call them CBB either, so maybe CBB is a manufacturer afterall.

[italianguy63]

.68uF also (red Tayda)  MC

[PRR]

"CBB" *may* be an old (expired) agreement on Common parts sizes.

Parts can be different sizes from different factories. This drove PC makers nuts. A committee came up with a list of part sizes, and if the idea caught on the PC makers sure would prefer to buy parts under that specification.

However the old "CBB" docs do not show capacitors and I can't find any newer docs. In today's industry, such a doc may exist primarily in Chinese (I would not find that).

If it is a size spec, but we can't find the spec, it is of little use.

Also the "same 0.1u" cap has to be different sizes for different voltages and other parameters. Parameters that we mostly do not care about here. So two "0.1u CBB caps" may not be the same size, for reasons that are not clear from a website's listing.

As nobody has come up with a compelling explanation of "CBB" and what it means to us, I suspect CBB is meaningless to us.