If you just want a lower volume put a volume box in the effects loop. This allows you to turn up the pre amp tubes and then drop the volume before the power section. The classic 30 has the volume in the front section of the pre amp. So when you turn down the volume the hiss remains high because the rest of the pre amp is at full volume. I get real nice bedroom levels with the volume box. I don't get real crazy with the pre amp either I think I have the normal volume at 5 on the clean channel and the pre at 3 post at 10 on the gain channel. I use the volume box to adjust the actual volume coming out of the amp and I get real nice tone at practice levels. However if you want to drive the power tubes harder this mod in the post should do it. What bums me out is I hate to cut the pins off of a perfectly good tube. Especially when I've thrown out used EL 84's in the past that had perfectly good heaters. I'm definitely going to do the 15 watt mod, but I think I'll wait until I have some spent up power tubes.