I have a Peavey XXX 1x12 60w combo (not the new super version model, the previous one)

Does anyone know what valves these come with originally? Mine has sovtek's in it but I'm sure I heard that they come with ruby tubes?

Also, do the valves make much difference to the tone? and if so, is it worth using a different make of valves to get better tones?

Ibanez S520EX w/ Swineshead Venom + Condor
Fender American Stratocaster
Fender Telecaster Blackout w/ DM Tone Zone + SD 59'
Peavey XXX 60w