I began work on this amplifier yesterday. Cleaning and testing old parts. Walked into a store and bought one capacitor. You know, hitting the ground running A cascode input for some flavor like a small-signal pentode (EF86) -> a cathode-follower stage for clipping and driving the tone stack -> a James type bass and treble control with some kind of mid-shift TBD -> a common anode mixing stage to mix the reverb and drive the power tube -> either a 12W 6BQ5/EL84 for 4-5W output, or a 6W 6DL5/EL95 for maybe 2W output. A medium-impedance reverb tank is driven by Merlin's SRPP reverb driver (no transformer) and recovered in a normal gain stage. So it's like a Vox AC4 Top Boost Reverb... ... ... The 6DL5 appears to be even more sensitive to high voltages than the 6BQ5, so I'm not sure if the transformers I have available are going to work. Every time I think about building around that tube, this issue crops up. But I want to hear it someday. 1-2W power amps get a lot of attention around here, and I think the designs look and sound great, but they are all based on triodes. This would be a chance to hear a pentode and judge if it's worth the extra trouble.