I was reading the two threads here yesterday on pulling tubes from the amp for less power. I have a Carlsbro 60 Twin amp head which I run through a closed back 2X12 cab rated at 8ohms. The amp has the following installed. Tubes: 4 12ax7 & 2 EL34 - Channel 1: 2 inputs - treble - bass - volume - Channel 2: 2 inputs - treble - bass - response - volume - For both channels: limiter - presence - reverb - Voltage selector - Impedance selector I play mostly at home and this is a very loud amp for that situation but I have recently started using it again as I can get a great sound out of it with my 25db midboosted Strat which can easily overdrive it at low volumes. I have the guitar plugged into the low impedence socket and the Bass & Treble around 12 o'clock, The volume knob goes from 0 - 5 and I have it set aroundabout 1/2 to 2/3rds from 0 - 1 any louder and it starts pictures on the walls vibrating etc. After reading the other threads yesterday I wondered if it was possible to pull one of the EL34's and alter the ohm selector switch from it's present 8ohms to 4ohms. I would just like to be able to let the amp do a little more work without getting any louder if you understand me.