Re: Carvin V3
There is no need to remove any tubes. You just set the switch on the back to the 50W setting and 2 power tubes will be shutdown.
I do however not see the point with the V3's construction. 50W is still extremely loud when you want to drive the power tubes into saturation as the V3 has lots of headroom. Without driving the tubes into power tube distortion the sound of the V3 is not really different with only 2 tubes.
Also the V3 has so much things you can dial in with all its possibilites (3 modes for each channel, EQ expand, master EQs etc.) if you still need more it is more likely that your pal has no real clue about the V3. However power tube drive can be nice (see AC/DC), I can get a real good Angus sound on the V3 without it. Or your pal is impatient, due to the large range of the EQ's even minimal alteration has great effects on the V3, so it can be a little pain to dial in sounds... I would recommend to ask him what it should sound like and then take your time and tune it...