Consonance Opera (sold)

The Reference 1.1 is a phase-inverted tube line stage incorporating a specially made power supply using an "improved SRPP circuit with no negative voltage feedback. AC voltage is applied to the input and routed to the EZ80 rectifier tube and choke and then to the plate load of a single ECC82 and dual ECC82s that provide voltage gain, so the Reference 1.1 uses a total of four tubes. The SRPP circuit is a special design in which a lower tube (for gain) and upper tube (which serves as the plate load for the lower tube) are used. The upper tube also acts as both a cathode follower and as a constant current source for the lower tube.

A gorgeous piece of equipment !!