6L6GC(Power-amp) and 12AX7(Pre-amp)
Epiphone Custom 1966 SG w/EMG 85(B)
Epiphone Les Paul
Peavey Valveking
Boss SD-1 Overdrive; NS-2
Fender Tuner
What kind of amp do you have? What sound are you looking for?

The question you asked was kind of like "what kind of vehicle will go fast?"
I'm looking for a really good distorted tone for metal (Amon Amarth, Children of Bodom, Lamb of God) I have a B-52 AT-112
Electro-Harmonix 6l6s and JJ high-gain ECC883s. Leave the stock rectifier.
*cough* everything you ever wanted to *cough* know about *cough* tubes thread *cough*cough*
Dissonance is Bliss

Signal Chain:
Carvin CT-4
Ibanez TS-9
Carvin Quad-X
TC Electronics G-Major
Mesa/Boogie 2:90
Ear Candy BuzzBomb

Member #4 of the Carvin Club
That thread won't tell him exactly what tubes will work for his amp and music type. It will work for getting a general idea of how tubes compare, but if you have no clue it's good to ask specifically.
hmm...stock rectifier. i don't exactly know what a rectifier is but i don't think my amp has one o' dem. the site says my amp has
2 - 6L6/5881 power amp tubes
1 - 12AX7 power amp tube
4 - 12AX7 preamp tubes