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In Reply to: RE: MR80 posted by Cougar on December 15, 2019 at 17:02:21
As Timbo said, power supplies matter, and you've done a good job with yours.
I've got a few tuner power supplies which need similar attention, so thank you for the inspiration. It's good to read that you're liking the improvement!
"I can't sell my guns back to the government. They couldn't pass a background check."
Follow Ups:
1973shovel, Happy New Year!
Yeah today I continued the repair and replacement of more things wrong. So I'm just fixing what this guy did like put a 100uF 100Vdc Nichicon Fine Gold cap where a 100uF 16Vdc cap should be. Then he put 2.2uF caps where 3.3uF caps should have been in the signal path. I also found one of the wires that go to where the 75ohm antenna circuit is at was ready to come off, so I had to fix that too. I put Elna RBD, Silmics II, and Cerafines in there. Now letting it break in again. The Super Narrow function works a lot better than before which it seemed like it wasn't working. I know the alignment will fix this stuff.
I will try to post some pics. I have one last PCB to work on before I send it to get aligned.
...please let us know who did it and if you're happy with their work. I have a MR-78 I've considered having touched up.
Regarding the 2.2 uF vs the 3.3 uF caps, did you consult more than one source for that information? I'm asking, because sometimes in process production changes occurred (not specifically at McIntosh), and what the unit was made with conflicts with the schematic. He may have replaced the 2.2 uF simply because that was what was in there, although he may have been sloppy and thought "close enough". As an example, one of my Dynaco tube amps has a 1 uF cap in the feedback loop, but the Dynaco parts list calls for a 0.1 uF cap. Dave Gillespie confirmed for me that the 1 uF value is correct, and the 0.1 uF was a Dynaco typo error.
It's good to hear that your work is paying off with better performance. Thanks for the posts!
"I can't sell my guns back to the government. They couldn't pass a background check."
It was also in the McIntosh parts list in the service manual I got from McIntosh. I will send them a email confirming just to safe.
I really don't trust anything that person did in this MR80, it looks like he just used what ever he had to get through the recapping. He even forced leads of caps that didn't fit into the island pads and bent leads all crazy like due to part being to big to fit just to make them fit. That's how I found that one trace damage was due to that.
I have read many post on different forums that the MR78 very close to the MR80 for pulling stations. I don't know how it sounds personally but I have read good things. I still have my FM-3 upgraded and the Fisher KM60 that just so nice sound. The KM60 is still the best sounding tuner I have but the MR80 is getting closer! :)
Have you done any more upgrades to your FM-3?
From the sound of things, it doesn't sound like he did quality work.
I'm glad the MR-80 is in good hands now!
"I can't sell my guns back to the government. They couldn't pass a background check."
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