Having scoured Google and AK for this information, I figured I would post it so it could be of use to others. This data was compiled from original parts in my unit, AK searches, official McIntosh part substitutions, and Echowars recommendations. The McIntosh part numbers are valid for all units, though the set of transistors as a whole are from the C28 preamp.
McIntosh Part Number, original transistor number, then valid replacements:
132-028 - 2N3738 - TIP50
132-065 - 2N4231 - TIP41B and TIP41C
132-090 - MPSA14 - MPSA14
132-092 - BC238 - BC549
132-093 - BC239 - BC549
132-095 - BC414C - 2SC2240BL and KSC1845(F or E) *
132-096 - BC416C - 2SA970BL and KSA992(F or E) *
132-105 - BC239C - BC549C
* The pin assignments/bias for these transistors are different from the originals, as shown here:
McIntosh Part Number, original transistor number, then valid replacements:
132-028 - 2N3738 - TIP50
132-065 - 2N4231 - TIP41B and TIP41C
132-090 - MPSA14 - MPSA14
132-092 - BC238 - BC549
132-093 - BC239 - BC549
132-095 - BC414C - 2SC2240BL and KSC1845(F or E) *
132-096 - BC416C - 2SA970BL and KSA992(F or E) *
132-105 - BC239C - BC549C
* The pin assignments/bias for these transistors are different from the originals, as shown here:
Attachments
Last edited: