Tube amp kit ideas for Ultrasone Pro 500 cans

[sal61]

I don't recall if the cans are hi impedance or not.
Thanks in advance for the input.

 

[Fast Eddie D]

Impedance is 64 ohm. That took 0.56 seconds to source on google.

Look up the Borbely headphone amps. There are cathode follower and hybrid circuits. These designs employ modern topology.