Best Power Tube Combo for Einstein 100?

[MatrixClaw]

Picking up a 100w Einstein in a few days and I'd love to experiment with different tubes. I owned the 50 years ago but only ever ran it with EL34s and since the 100 can do different tubes in each pair, I'm curious to try some combinations. On hand, I have:

• (4) Mesa 6L6 GC STR 420
• (2) Mesa 6L6 GC STR 440
• (4) JJ 6L6 GCs
• (4) Fender / Groove Tube GT 6L6 B (Sovtek)
• (2) Ruby 6L6GC STR
• (4) JJ KT-77s
• (2) Groove Tube EL34L
• (2) ARS E34L (Tesla/JJ)
• (1) ARS E34 (Tesla/JJ)
• (4) Ruby EL34B STR
• (2) JJ EL34
• (2) Valve Art 6550A

Thought I had some KT-88s and KT-66s, but I guess not... Thinking of maybe going all KT-77s or maybe a mix of the 6550s and something else?

 

[FLUXX]

I would try the KT77's with those Ruby 6l6GC STR's!