bump.. I too want to see more of flea-powered OTL.
Here's something i simulated recently.. a pair of 6AS7/6080 triodes for each channel. The use of output coupling capacitor was intentional as i want to avoid using DC servo (which complicates the PS requirement, if not else). Overall, one heater power supply, one 300VDC HT and one -32VDC bias is all it needs for two channels.
The LTP perhaps can use 6SN7/6N8S if you want to run more plate current.. but considering 6AS7 is low mu, i think 1.5mA is enough to cope with the miller capacitance. It's a trade off between open loop gain and plate current.
It's not exactly 2W.. output is 5Vpk to 8ohm which translates to 1.5W. THD is 0.83%. I'm sure it can be improved.