any question...some questions?

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So many variables and unknowns, a bit like I have some shoes where should i walk ?

a 2n3055 is a readily available TO3 as is a MJ15003 PSU Voltage ? Topology? Current Bias? Differential pair ? Opamp ? You could study many of the fine Solid State Amps published at DIY Audio

A simple L pad arrangement resistor preamp usually works straight away.

Cheers / Chris
 
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