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New to me McIntosh MC2205
New to me McIntosh MC2205
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Old 8th April 2015, 10:27 PM   #11
Zen Mod is offline Zen Mod  Serbia
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New to me McIntosh MC2205
damn collectible

get it to someone both trusty and versatile in amp repairs

that's no thingy for first steps in amp repair
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Old 8th April 2015, 11:17 PM   #12
Thinker1920 is offline Thinker1920  United States
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New to me McIntosh MC2205
Transistor #1

Positive Probe Base, Negative Probe Collector .476
Positive Probe Emitter, Negative Probe Collector Open
Negative Probe Base, Positive Probe Collector Open
Negative Probe Emitter, Positive Probe Collector Open
Positive Probe Base, Negative Probe Emitter .48
Negative Probe Base, Positive Probe Emitter Open

Transistor #2

Positive Probe Base, Negative Probe Collector .416
Positive Probe Emitter, Negative Probe Collector Open
Negative Probe Base, Positive Probe Collector Open
Negative Probe Emitter, Positive Probe Collector Open
Positive Probe Base, Negative Probe Emitter .449
Negative Probe Base, Positive Probe Emitter Open

Transistor #3

Positive Probe Base, Negative Probe Collector .426
Positive Probe Emitter, Negative Probe Collector .647
Negative Probe Base, Positive Probe Collector Open
Negative Probe Emitter, Positive Probe Collector Open
Positive Probe Base, Negative Probe Emitter .257
Negative Probe Base, Positive Probe Emitter Open
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Old 9th April 2015, 01:15 AM   #13
djk is offline djk
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Use the diode test range and check all base-emitter junctions, and all collector-emitter junctions.
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Old 9th April 2015, 01:27 AM   #14
Thinker1920 is offline Thinker1920  United States
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New to me McIntosh MC2205
That's what I did
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Old 9th April 2015, 01:40 AM   #15
Zen Mod is offline Zen Mod  Serbia
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New to me McIntosh MC2205
#3 is Dodo
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Old 10th April 2015, 05:46 PM   #16
Thinker1920 is offline Thinker1920  United States
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New to me McIntosh MC2205
I've been told that all the output transistors should be changed when one goes bad, in my amp the McIntosh part numbers are 132-188 and 132-189 but, the manual refers to them as 132-164 and 132-165, which can be replaced with MJ15003G and MJ15004G but, the drivers McIntosh Part # 132-151 and 132-152 are nearly impossible to find outside of replacements from McIntosh which cost about twice as much as going to a parts supplier. There is one transistor that is close the MJ15024G but the gain is 15 to 60 where the original was 20 - 100. So I'm not sure if that's a suitable replacement.

Another thing I learned was that the early production MC2205's used Inductive resistors that could cause oscillation that were replaced later with non inductive resistors, you can tell the difference by look at the them, the inductive type will have 5WL where the non inductive will have 5WW. I've been looking for replacements and was wondering if this would work http://www.mouser.com/ds/2/427/lvr-239788.pdf it says Low inductance and "• Ideal for all types of current sensing
applications including switching and linear
power supplies, instruments and power
amplifiers" if not the only resistors that I can find are $1 more a piece that are rated non inductive. which might sound silly but I'm finding repair costs are adding up fast :P

Last thing, I know that I'm going to need thermal compound when I replace the transistors and I was wondering if anyone could recommend some, non conductive of course.

Thanks
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Old 10th April 2015, 05:56 PM   #17
lafish is offline lafish  United States
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I second Zen Mod's sage advice. Find a McIntosh specialist, there's lots of them out there, and let them do what needs to be done. I sold these back in the day, and it's a very nice amp, equally at home with the big JBL's and Klipschorns of that era, as well as Magnepans and other power-hungry beasts. Not as fast or transparent as some solid state amps, but very mellow, very pleasant to listen to for hours on end.
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Old 10th April 2015, 06:02 PM   #18
Thinker1920 is offline Thinker1920  United States
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New to me McIntosh MC2205
I don't have the money to pay someone to repair it, otherwise I would.
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Old 10th April 2015, 06:17 PM   #19
Zen Mod is offline Zen Mod  Serbia
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New to me McIntosh MC2205
Thinker - considering that many could tell you that you're stroked with golden lightning ......... either sell it for good money to some collector or - if you want to keep it - be patient rather than ruin it working without proper skill and knowledge ;

with some luck , I'm sure you'll find that someone skillful from Diyaudio is near you , so proper repair will cost you some gas and some beer

and you may find new friend .......

I would gladly fix it for ya free of charge , probably even parts for free , but we have significant amount of water between us

your honest and simple sentence I don't have the money to pay someone to repair it ...... worth half of gold bar itself
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Old 10th April 2015, 07:29 PM   #20
Thinker1920 is offline Thinker1920  United States
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New to me McIntosh MC2205
Quote:
Originally Posted by Thinker1920 View Post
Another thing I learned was that the early production MC2205's used Inductive resistors that could cause oscillation that were replaced later with non inductive resistors

That's wrong I misread a post, the original design needed the slight inductance to prevent oscillation.
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