A note...Dennis Had is back with SEP (he's lately been doing mostly lower powered SETs...my amp is a pentode model) amps on Ebay that seem to be orderable as he notes different color face plates are available. He's added a stereo volume pot but I imagine you can get him to eliminate it maybe...a world class hand made amp at a bargain price IMO...note I have no affiliation with Had except my daily astonishment at how good my Had amp sounds.
Efficient, affordable speakers for SETs?
Ever since I discovered the magic of SETs, I have been hooked and could never go back to “sand amps” or non SET tube amps. (Yes, I know they are dirty and colored but I love the soft clipping!) The seemingly endless problem has been finding speakers that not only function well with just a few watts of power but get the most out of the limited power and also sound real. Tried Lowthers in Medallion enclosures and some other enclosures but ultimately not very natural or satisfying. Realized that a two way speaker properly crossed over to a tweeter was best and found a speaker that was specifically designed to play with 8 300B watts. The Tetra 506s (worth checking out Tetraloudspeakers.com and the great musicians who use them!). Does anyone know other two way speakers designed to work well with SETs?