triple x

Hey guys! First, I am away of the spec differences and similarities between the two amps. I am fully aware that a 3120 is a Triple X with EL34's. So my Triple X took a shit on me and the repairs will cost me more than the head itself. So I'm just going to replace it! Anyway, I'm noticing...

Can it be done? I know you have to pull 2 tubes but is that good to do on this amp? Won't cause any problems? And which two should I take? Sorry, I'm kinda a tube nube. Thanks guys!

Brief & Accurate Description of the gear: Hi, I'm selling a used Peavey Triple XXX 2x12 combo with foot pedal. It's 120 watts and I will include the heavy duty locking gig case with wheels I bought for it as well. It's in very good if not perfect shape, I've never giged with it, we only used it...