I have the same pre amp, only the dual version with the 300b as an alternative output.

How do you like your power amp ? Is it a Can amp? I am not familiar with this amp, so I am a bit curious.

How is the gain match between the amps ?

Do you hear any hiss from the pre ?

The power amp I use is the class A Belles SA 30, it sounds sublime but the gain is a bit of a mismatch although it works, on the 300b output I can turn the gain down, which works great, but with the Belles it can get too cozy sometimes, the 6SN7 is a bit less romantic and has more drive for more rhythmic music, I love to change between outputs as the 300b can sound wonderful with voices and small assembly Jazz or Classical.

The Belles gets warm which has me thinking about maybe have a extra power amp, maybe trying a class D power amp In the future, wished the Atma-Spere ones were cheaper as they are supposed to sound a bit like tubes.