I used a cuctom Bottlehead 2A3 stereo amp with JJ 2A3-40 tubes and MQ 2004Jr. trannies with ten slices of Cobalt in the center of the stack. I drove it with Custom BH Linestage using 6C45-Pi tubes into MQ B7 Cobalt trannies and fronted by a Transformer Volume Control by IAG, the rig powering Omega Super Fives with the upgraded drivers.
The whole thing sounded pretty great, with both delicacy & slam, with just 3.5 watts of single-ended juice.
Cheers, Hank