After completely rebuilding my Blues Jr., I have the old cabinet, speaker, power transformer, and output transformer lying around. Since these tend to be the most expensive parts of an amp, I started to look around for low watt push-pull amps that I could build. I ran across the Dragonfly on the AX84 site that looked like a good option. Here is the schematic courtesy of Doug Hammond. The Dragonfly calls for a Hammond 269JX power transformer which is rated for 500VCT at 69ma. The Blues Jr transformer is 240V at 125ma with no center tap. So the first change is that I'll need to use a bridge rectifier instead of a two phase rectifier. Unless I am totally off, I think the B+ will be pretty comparable. The second issue is that the output transformer for the Blues Jr. has a much lower impedance (~5000 ohms) than what the Dragonfly calls for. But using both ECC99s, I think I should be able to power an 8 ohm speaker just fine. So what do you think, does this project have a shot, or am I missing something?