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On Feb 19, 7:26 am, Tim Schwartz wrote:

Eric,

The McIntosh part number a

132-021 for Q107 (or 108)

132-032 for Q109 (or 110)

The 132-021 is a 2N3569. The 132-032 is similar to a 2N3645 and
according to my McIntosh info, is an approved replacement.

Later, McIntosh used a MPS-A05 (132-171) and MPS-A55 (132-172) pair as
replacements.

Regards,
Tim Schwartz
Bristol Electronics

Thanks Tim. I appreciate the info. All the major part houses list
the MPSA05 as a direct replacement for a 2N3569. Furthermore, the
MPSA05 has been superseded by MPSA06. I'll give the 06/56 a try
before searching for the old parts.