Home Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

RE: McIntosh MA6100 repairs

I used MJ15003G, the same shipped by McIntosh.

There is one further thing I've noticed. After playing music for a couple of hours, one channel's heatsink is still warmer than the other. All DC measurements I can take between the two channels have them very close to one another. The only difference I can find is that on Q405 on the warmer channel, I measure about 22Megohms between base and emitter. On Q406 on the other channel, no resistance registers on a Fluke DMM.

At idle, there is no difference.

Unfortunately, no generic transistor cross seems to be known for Q405/406 (132-081), meaning I'd have to order from McIntosh, which takes about 3x as long as ordering from Mouser.

This post is made possible by the generous support of people like you and our sponsors:
  Audio Hoarder  

Follow Ups Full Thread
Follow Ups


Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.