Tubes for Audio Mirror T61

Greetings

Does anyone own this preamp?

If so, could you tell me if 6922 tubes would work?
How did they compare to the 61N's?

It uses two 61N tubes, if I can try the 6922 that would be good to know because I have some around here to try....nothing special but it's fun to tube roll.

I bought this here an the Gon and don't have it yet.
I have contacted Audio Mirror,but have not heard back yet...
I guess I'm gettin antcy.

Thanks