I found this circuit in an article in a 2003 publication. The circuit is an example of how to implement an amplifier with complementary pair 2N3055 and MJ2955 to get excellent sound quality with an output power of 30 W. The supply current order should be at least to mono version 1 A and 2 A for stereo. The source must have excellent filtration. The transformer unit has 45 V secondary voltage. Changes of some components have been made to facilitate assembly today, using more current equivalent components.