High Voltage Bipolar Replacement type(s) for MJ16012 in HP 8663A ?

[Uky]

Greetings.

I picked up an HP 8663A on a flea market with a not working inverter.
The design uses two high voltage bipolar transistors MJ16012.
One of them was broken and one of the electrolythinc capacitors in the same
circuit was "boiled" (short circuited).

I was able to repair the inverter, replacing the transistors with BUX48
that I had in my junk box but now my supply of bipolar high voltage types are depleted.

DigiKey and Mouser lists a few types that are still produced and most likely
available. The BUX48 had specifications that was "near" those of the MJ16012
but I do not know if my choise will be long lived. About one hour after
having had the instrument in operation, I turned the instrument OFF,
disconnected the AC (pulled the plug), quickly removed the
inverter PCB and tried to asess if there were any signs of thermal stress on the
replaced components. They were all att room temperature. At least not any signs
of heat dissipation in the electrolythic capacitors ((2x10 uF/350V)  x 2)

As I have read, there are more than one enthusiast that has had problems with this inverter
board. If any one would be willing to share what other type(s) of high voltage bipolars
that worked I would be grateful.

Cheers

Ulf Kylenfall
SM6GXV