What is this transistor doing here?

[Fet_street]

Can anybody tell me what this transistor is doing here? Yes I know it has an element of voltage divider but I wanna be sure I don't break the amplifier. The d600e transistor failed and I want to know if there's any way I could bypass this transistor to get it running today or any common transistor I may have laying around to replace it with

 

[Brett]

Can you share the entire schematic? It may be a little easier to decipher what's going on with more information.

 

[Feral Feline]

Computer’s in the repair shop, or I’d see what might be an equivalent trans in one of my comparison charts (all of which I found online * hint hint *)

 

[finebyfine]

I think it’s there to act as a capacitance multiplier of the 100u capacitor

 

[Mcknib]

It's an NPN power transistor so if you've any spares with the same voltage rating as the 2SD600E it should be fine I'd check anything you've got against its datasheet or just get one I think you can still get them easily enough

 

[JTEX]

It drops the 68V to 37.8V.

 

[bean]

Got yourself a custom regulator there. 68v in, voltage divider to provide ~40v to the transistor base, then ~38v out.