Yep (though I thought these guys used GZ34s vs 5AR4s, whatever the case that would be them). My 1200s (same power section; diff preamp) is a later one - still has the rectifier tube sockets, but the second one isn't even wired up (so nice of Conrad to put it in there anyway, in case one wants the tube sag) and the first one has a plug in diode bridge module instead of the tube. Tighter bass with ss rectification and more headroom. Since there are multiple unused pins on octal base rectifier tubes, it's actually stupid simple to mod an amp to have the option for both. Just need 4 diodes (buck each on the outside), a switch, and a soldering iron . Good backup too in case a rectifier tube goes.