Re: More cap talk!
here's my usual quote from
Ken Fischer :
I said, "Never use a ceramic disc as a tone cap in a guitar". Of course the question became what I should use? I don't know!!! O.K., I do know! (You guys, and gals are sharp)
First capacitors come in multitude of types, values, and voltages. The Sprague Black Beauty, also known as "bumble bee caps", are really great. Of course they don't make them any more.
I have heard that Gibson has had these caps made again for the 2003 Gibson Historics, but are not being as an aftermarket item. If you have a 50's Gibson, the .02 (really .022) Black Beauty was used. I used an old Fender value, Black Beauty in my Tele. It is a .047, (Fender calls for .05, which is for our purpose, the same thing). These caps were nicknamed Bumble Bee because they had color code bands around a black body. They look sort of like a giant Bumble bee.
Let's get to the important points of choosing a modern cap. First you want the correct value. Of course, feel free to try other values than traditional ones, if you are after something different. Most humbuckers use .022 (.020), and most single coils .05 (.047). You want separate film foil, not metallized types. Mylar and polyester film works better then polypropylene film.
Since pickups put out very low voltage, the voltage rating should not matter, but it does seem to have an affect. Traditional voltage values are commonly, but not always, 200 or 400 volt ratings.
The Black Beauty caps used in old guitars were typically the 400 volt type. Another interesting point is that, if you reverse the cap end to end, it will sound different in use. I jump mine in with test clips, run the tone control through its range, and use directions my ear choose. Also, if you have many of the same type, try a bunch of them. They will vary slightly from cap to cap. It's worth the time to choose one you really like with your gear.
Lastly, some people put a bright cap from hot to slider on the volume control. This is so the highs do not roll off when turning the control down. This is very amplifier/speaker dependent.
In any case, a silver mica type is my choice, if you use one. The value judged by ear, using your guitar with your amplifier. 30PF to 220PF is the most common range. Fender once did a Tele with a .001 (1000PF) --- OUCH!
