The other amp on display here was the Liquid Glass ($2,950), Alex’s answer to tube-a-holics. A solid-state/tube hybrid design, the Glass has quite a bit on offer for the tube roller. From Chris Marten’s review on Hi-Fi+:
Moreover, the tube section is extremely versatile, providing pairs of both octal (that is, eight-pin) and nonal (that is, nine-pin) valve sockets, with separate user selectable controls for setting valve heater and plate voltages. For my tests I tried sets of 6SN7, 6GU7, 12AU7, CV181, 8416, and 6922 valves, but there are many more types of valves the Liquid Glass can support (see Technical Specifications, below, for a complete list). As a general rule, if a desired valve type fits the Cavalli’s valve sockets (and, Dr. Cavalli advises, “conforms to either 6SN7 or 12AU7 pin-out arrangements…”), then the valve can be made to work in the Liquid Glass. The point is that users can choose from amongst hundreds of types and brands of valves, each offering their own distinctive take on the sonic truth.
That’s awesome. No. Seriously. That’s awesome.
All told, this was Summit-Fi for headphones, laid out on a table in sunny SoCal. Doesn’t get any better than this … ahhhh ….