PG-506 Fast Rise generator.


I found Q862 to be faulty in fast rise section of PG-506 generator.
PG-506 manual asks for Tektronix part 151-0525-00 and further is referencing to S39291. In Cross reference Tektronix manual I found this is selected pair with Q860.

I doubt if these transistors are obtainable. What contemporary transistor would work in this circuit. I have curve tracer and could do some matching. Which parameters will be the most critical. Thanks in advance.

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