Who has the strange/earliest version of Mcintosh MC250 schematic?

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Eugenehifi

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Joined 2012
#1
I recently bought a MC250 from eBay and the amp. need some repair. The circuit setup is quite different from the schematic and the images I saw on the Internet. The serial number had been almost faded out. I think it said something like 20Lxx. The Q11 and Q12 (132-515) drivers mounted on the chrome chassis and not on the power output boards. The power output PCB number is 128-042 and the Input Section PCB number is 128-037
 

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#2
Eugenehifi said:
I recently bought a MC250 from eBay and the amp. need some repair. The circuit setup is quite different from the schematic and the images I saw on the Internet. The serial number had been almost faded out. I think it said something like 20Lxx. The Q11 and Q12 (132-515) drivers mounted on the chrome chassis and not on the power output boards. The power output PCB number is 128-042 and the Input Section PCB number is 128-037
Click to expand...

Eugene,

I just purchased a very similar unit to yours...have you found anything? I have serial number 22L96 which has the same layout and (hopefully) schematic as yours.

I just called the McIntosh service department...but I haven't heard back from them yet. (To be fair...it was 2 minutes ago.)

Let me know what (if anything) you found.

I'll keep you updated as well. The previous owner swore there was something wrong with it (it was the owners Daughter-in-law, the original owner had passed away and she was reporting what he had said) but I can't find anything yet. Would like to track down a schematic to do a capacitor replacement.

Scott
 
#3
SpeakerScott said:
Eugene,

I just purchased a very similar unit to yours...have you found anything? I have serial number 22L96 which has the same layout and (hopefully) schematic as yours.

I just called the McIntosh service department...but I haven't heard back from them yet. (To be fair...it was 2 minutes ago.)

Let me know what (if anything) you found.

I'll keep you updated as well. The previous owner swore there was something wrong with it (it was the owners Daughter-in-law, the original owner had passed away and she was reporting what he had said) but I can't find anything yet. Would like to track down a schematic to do a capacitor replacement.

Scott
Click to expand...

Apparently they made it in three major versions....I have one that was made starting with serial number 21L98.

Scott
 
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