HP13 Transistors

[Ken Bakhaus]

M. Kassay asked:


"A friend of mine has a HP-13a power supply, and needs the
replacement part numbers for Q1 and Q2. on the schematic.  Can
anyone assist?"

Since the answer may be of interest to several, I've routed my answer back through the reflector. My transistors on my HP13 went out many years ago and I replaced them with 2N1558 or equiv MP1558, both by Motorola. Don't know if these were exact replacements but worked fine. Don't know if they are even still available.

kcb

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