Altor-Zen, or Altor-Pass - these names were given to this amplifier by friends of mine. The excellent designs of Nelson Pass - Zen, Zen2, Zen3, Penultimate Zen4 were the basis of this design.
Zen - it is not only the name of amplifier, this is also the name of the topology. Like Follower-99 from Andrea Chiufolli, both two topologies has no signal current through the power supply.
Single End (SE) MOSFET amplifier. take Zen-3, made some changes and add the input stage. Instead of FET in the Zen4, I used tube input stage - ECC88 in the SRPP.
On these photos you can see the internal and external view. Amplifier was built many years ago, and as I have other amplifiers, sometimes I connect Altor-Zen to my audio system and have a fan with its sound. At
fists, amplifier has no volume control - only 2 trimmers ant the back side. As a volume control, a variable output of the CD-Player was used, but the relay based #nikitin# attenuator with volume knob at the front
panel was added in a time.