hey all. in the never ending quest to coax sweet tone out of my ac30 at lower volumes, i've stumbled upon ted weber's Hi-Lo Power Switch mod kit for cathode biased amps. I know that cathode biased amps are special and you can't just pull a pair of output tubes from them and adjust ohmage to decrease the wattage. I assumed it wasn't possible to do a half-power sort of deal on a cathode biased amp like an ac30, but apparently this kit allows you to do that: $15 Hi-Lo Power Switch This kit allows you to go to half power in a cathode biased amp by changing the cathode resistor and ungrounding two of the output tubes. It can also be used for fixed biased amps by just ungrounding two of the output tube cathodes. Build info: Suggested Implementations Qty Cathode Resistor 50 ohms 100 ohms 150 ohms 250 ohms 300 ohms For this kit, there are two resistors in the output tubes cathode circuit. If you calculate that you need 50 ohms for 4 EL84's, for instance, you would order 50 Ohms. Then, when you flip the switch to the low power mode, it puts two 50 ohm resistors in series for 100 ohms, and also disconnects two of the cathodes. does that seem legit?? I'm not that techie, but i guess it all checks out. I know a lot of cathode biased amps have pentode/triode switches to adjust the wattage. Is this a different beast or in the same ballpark?? I have an ac30cc2 which has a bias selector that lets the amp operate at 22 watts instead of 33. I always have it on the lower wattage setting. If I could install this half-power dealy then I could presumably bring the wattage down to 10-12 watts which would make it much more friendly to my playing as i crave low headroom. so is it that simple?