6L6 or 300B or 2A3?

not sure that a 2a3 or 45 tube amp (unless it were a PP or parallel SE amp) would be enough wattage for the Cicada. If I remember correctly these are @ 90db efficiency. If your room is small it might work fine. 6l6 is a nice tube though as well ... hang on to the 6l6 amp for a couple months if you decide to go with another. sometimes a change is nice but not ultimately better. you may end up going back to the 6l6

Just found this on TNT Audio's site:
"The Cicada is rated at 94dB/1W/1M, efficient enough for almost any 2A3 or 300B SET amplifier."

did not think they were that efficient ... I stand corrected ... if your room is big I still don't know if a 2a3 or 45 would cut it but worth a try I guess!

They may be to inefficient.The 45 only puts out 1.5-2 watts if
I'm remembering right.10-12 watts plus sounds more fair if its
not a large room.

My speakers are 97 db (Classic Audio Loudspeakers T-3) and I find 30 watts to be about the minimum, but I like to listen at higher volume levels (95db peaks).

A 45-based SET makes about 1 watt. You will have about 10% distortion at that power level, IOW you will not be hearing what the amp really can do- you need a speaker about 10 db more efficient than that (104db)! If you drive SETs hard, the qualities that they are known for will not manifest. A 2A3-based SET will only make about 3-4 watts, so you will still be limited by the power levels. Now if you had a P-P 2A3, then you would be making about 15 watts, enough to make things more life-like.