I've got a Traynor YBA 3 head that I pulled all 4 output tubes out of (6ca7/el34's) to use in another amp, just to see if it worked. Now, i want to put the tubes back in the YBA 3, but I don't remember what order i pulled them out in. Does this matter? Do I need to re-bias the amp or have the tubes checked to see if they are still matching? I'm not too familiar with this shiz, any advice would be appreciated!

if they're truly matched, it won't matter what order you put them in. unless they're pretty much brand new, they're not likely matched, and even if they are brand new, and "matched" there's still a fine chance that they're not exactly matched for the very-high voltage that the YBA-3 runs (about 560V, as opposed to the 400-450V that you'll find in most amps like Fenders, Marshalls, and Traynors other than the YBA-1A or YBA-3).

the easiest way to check how well they're balanced involves pulling the amp chassis out of the cabinet so you can attach a bias probe. If it's a pre-1971 amp, this is relatively easy, but in amps with the pop-top design, where the chassis stays in the cabinet and the top panel lifts off, a bias probe is pretty much out of the question.

you can mod the amp and put 1ohm resistors on the cathodes of all the EL34's, and then measure the cathode voltage (as a proxy for current) to try and see how well balanced they are.

in general, your best bet is one of two choices. either spend the time to learn what you need to know to become somewhat competent as a tech (and a Traynor is an excellent amp to do that with, so long as you stay smart and safe) or the other option, which is to take it to a qualified tech. doing it half-assed is not really a good option. kinda like in Karate Kid, when Mr Miyagi tells Daniel about "you karate do yes, you karate do no, etc".

thanks for the info Scott! you truly are a man with encyclopedic knowlege, or some sort of universal deity of some sort.

nah, just a dork who's spent lotsa time and energy on learning stuff about how to use tubes.