Reading and reading some more. It appears I can just plug in a pair of 2a3's, set bias and go. Were are now set up for 45's with output trans. 5k@50mA?
You did not state which TSE you have, but the issue is pretty much the same with both boards. The 45's draw 1.5 amps of filament current for a total of 3 amps on the filament regulator. 2A3's draw 2.5 amps each for a total of 5 amps on the regulator. You may need to increase the size of the heat sink on the regulator when running 2A3 tubes.
Swapping in 2A3's alone will not make much more power than the 45's since the 2A3 prefers a 3000 ohm load. They will sound different and will often produce better bass due to the increased damping factor, depending on how your speakers respond to an increased DF.
If your OPT has a 16 ohm speaker tap connecting an 8 ohm speaker to it will reflect a 2500 ohm load to the tube, as will a 4 ohm speaker on the 8 ohm tap.
Swapping in 2A3's alone will not make much more power than the 45's since the 2A3 prefers a 3000 ohm load. They will sound different and will often produce better bass due to the increased damping factor, depending on how your speakers respond to an increased DF.
If your OPT has a 16 ohm speaker tap connecting an 8 ohm speaker to it will reflect a 2500 ohm load to the tube, as will a 4 ohm speaker on the 8 ohm tap.