SET Recommendation

Don Garber's Fi X is also there!!!

A 2A3 is a true triode.The EL84 is a pentode that they will wire up to run similar to a triode.I would lean toward a true triode to get the full benefit of one.That is with everything else being equal.In other words a better made EL84 can sound better than a poor 2A3 amp.The Antique Sound Lab "Tulip"is a decent sounding 2A3 amp.They've been making it for several years and keep raising the prices.Years ago they were $1000,now they want $1500 for a new one.I've heard people buy used ones in the past for $400.I don't know what one could be bought for now.It puts out about 3 watts real triode.

If you can find a used pair of Wright 3.5 amps (2a3 based SET) that would be another good option. You do realize that the speakers you pair an amp like this can make or break it. That interface is critical.

Good recommendations above. As mentioned, the 2a3 is the way to go.