Re: VITAMIN Q Caps?
Caps in guitar circuits are a strange thing. The differences in tone depend
a lot on the pickups, pots, and wiring you've got in your guitar, and how you use your tone controls.
For guys that don't ride the tone control all the time, it's probably not worth trying out other caps. Then again, maybe with a different cap, they
would be riding the tone control all the time.
Papersoul, I've only heard the Mallory caps in a friends guitar, I haven't owned any myself. They seem like a great PIO cap, a bit less transparent than, say, Hovlands, (which is a good thing for many people.) Just going by memory, it seems like they maybe had more treble than Q's, but then again, they were in a Strat, and I'm pretty used to ES-335's... What value are they?
You can indeed get a nice wah-wah sound from caps, esp. PIO caps, but it's equally important to have the right taper on your pot.
I've been using RS Super Pots for volume, and their custom CTS pots for tone. I used to use Centralabs, but they're almost impossible to find now, and really pricey. RS duplicated the old Centralab pots, but improved the quality. And their Super Pots have the most perfect taper for volume I've ever used. I'll never go back...
http://www.rsguitarworks.net/cms2/
I'd definitely suggest trying one of those Mallory caps out, cause if you don't like them, you could sell them for a good amount of money. If you like them, that's great too.
The Russian PIO's are military surplus, and are very well made, great-sounding caps. Compared with a Q, I think they have a better bass response, (not as compressed,) and a smoother high-end. But this is really splitting hairs, and as you've said, these differences disappear in a band setting.
But in a band setting, you definitely can still hear, and feel the differences between foil, ceramic and PIO caps if you use the controls a lot, and don't use a ton of distortion.
As far as getting the Russian caps, there are quite a few Russian online shops that sell them, but shipping is obviously high, and some of them seem a little sketchy.
Radio-Spares runs an ebay store, (uralspirit is the seller name,) and they've got a huge selection of PIO caps. You usually have to buy in some bulk to get the best prices, but you could get 10 of those caps for the price of 1 Q.
Also, check out Tone Mojo,
http://tonemojo.com//. Jonesy has a huge selection of caps, and he has great service and prices.
Oh, and Super Rad Ska, guitar's circuits really don't deal with much voltage, so you can pretty much use any rated cap you want. Most guys use 200-600 volts, simply because that's the best size, (usually) for guitars. You can get a 1200 volt cap that will sound pretty much identical, but it'll be huge, and might not even fit in some guitars cavities.
Caps are definitely worth exploring if you're on a quest for the perfect tone. But, as always, it's best to let your ears be the judge, rather than what you
think you should like. Like I said, I know lots of guys who love OD's, even the cheaper ones, and they get great tone. There's nothing wrong with that, and if they're happy, no reason to change!