Strange old BJT

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Hi!
Before some days I acquire one old Quadro receiver with discrete
output circuitry. One chanel was dead so I found one output
transistors are blow. Problems then started: on this particular device was mark ...Hirel, 218, Q, 110017.
Amp is runing on voltage about 60..70V rail to rail.
How to replace this kind of device.

Please help me with some solution.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.