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  #21  
Old 02-14-2018, 04:27 PM
eddiel eddiel is offline
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Thank you for the feedback Tom. Definitely makes me a feel a bit more positive about the repair.

Out of curiosity, what could've caused the blow out? Could something else have failed like a tube (although the KT88s seem fine I can;t test the old AT7s) or something else on the board?

I'm hoping to learn a bit through this process as well and I am curious to know what might have caused it in case it's something I need to be aware of in the future or if it's just one of those things.
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  #22  
Old 02-14-2018, 05:22 PM
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I think it was simply a failed connector.
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  #23  
Old 02-14-2018, 05:35 PM
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Quote:
Originally Posted by W9TR View Post
I think it was simply a failed connector.
That would be welcomed news -- awesome job Tom troubleshooting.

Best Sir,

Bob
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  #24  
Old 02-14-2018, 05:56 PM
eddiel eddiel is offline
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Quote:
Originally Posted by vintage_tube View Post
That would be welcomed news -- awesome job Tom troubleshooting.

Best Sir,

Bob

I second this post! Thank you all so much for posting in this thread. It's been really positive and helpful and I've learnt a few things too!

Good group of people on this forum
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  #25  
Old 02-14-2018, 06:28 PM
godwinaj godwinaj is offline
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Just to be safe before cutting and soldering I'd put a meter on the board to make sure there isn't anything shorted or showing lower impedance. You should be able to compare the resistance on the circuit that's working to the one that failed. You can also some what check the transformer. The meter tests DC resistance and transformers work on AC by nature. But if you check leads that are supposed to be similar and get wildly different reading you know there could be damage.

If you don't own a multimeter I recommend you buy one. You can get a basic Fluke one on Amazon pretty cheap now a days.

My concern is there could be thermal damage or other issues lurking. Manufacturers aren't usually happy with home gamer mods and fixes. If there is something else going on you don't want to open a bigger can of worms.
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  #26  
Old 02-14-2018, 08:15 PM
eddiel eddiel is offline
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Quote:
Originally Posted by godwinaj View Post
Just to be safe before cutting and soldering I'd put a meter on the board to make sure there isn't anything shorted or showing lower impedance. You should be able to compare the resistance on the circuit that's working to the one that failed. You can also some what check the transformer. The meter tests DC resistance and transformers work on AC by nature. But if you check leads that are supposed to be similar and get wildly different reading you know there could be damage.

If you don't own a multimeter I recommend you buy one. You can get a basic Fluke one on Amazon pretty cheap now a days.

My concern is there could be thermal damage or other issues lurking. Manufacturers aren't usually happy with home gamer mods and fixes. If there is something else going on you don't want to open a bigger can of worms.
I think I'll leave this one to the local service technician. I could make the repairs as Tom described above in terms of physically being able to carry them out. But your post serves to remind me that, I clearly do not know enough about what's going to start messing around with it.

The technical engineer at work did say I could borrow his multimeter if I wanted to poke around but I wouldn't even know where to begin in terms of placing the probes, etc.
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  #27  
Old 02-14-2018, 09:34 PM
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Quote:
Originally Posted by eddiel View Post
I think I'll leave this one to the local service technician. I could make the repairs as Tom described above in terms of physically being able to carry them out. But your post serves to remind me that, I clearly do not know enough about what's going to start messing around with it.

The technical engineer at work did say I could borrow his multimeter if I wanted to poke around but I wouldn't even know where to begin in terms of placing the probes, etc.
Sounds like some sound logic to me! I don't ever want discourage anyone from learning and playing and DIYing. But, there can be a lot of angry volts in a tube amp. I cut my teeth at fairs and festivals in the summer trying to make my grandpa's Grommes Precision amps work for an entire event without overheating and burning things up. Sometimes they are easy fixes other times you call dad and have him send you something with a transistor.
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  #28  
Old 02-19-2018, 01:35 PM
eddiel eddiel is offline
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Just a quick update...I took the MC2102 in to my local dealer on Saturday. I also brought it printouts of the photos I took and the advice posted by Tom in this thread. I was happy that they took it all and said they'd pass it onto the repairman (who's authorised by McIntosh). They seemed to agree that it was not a transformer issue which made me very happy.

Fingers crossed I'll get an update soon as to the extent of the damage.
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  #29  
Old 03-07-2018, 11:30 PM
eddiel eddiel is offline
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Still waiting on the final diagnosis but preliminary information is that the power supply leaked. Which is somewhat good news because the transformers are fine.

I really miss not having my amp though. Still have no idea when it'll be ready either.
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