MR67 static and permanent mute

[david winter]

Hi,

I'm working on a nice MR67 and found the source of the constant static noise on both channels.

 

[david winter]

The problem is the T6 discriminator transformer. One of the internal mica capacitors is bad and leaks. It's not the 33pF accross both coils, but the one in parallel with the primary and sealed between two plastic bases maintaining the pins.
T6 is reference T-107-135B. It was used by several tuners including the MR71 but McIntosh has no stock (from what I read in some other posts).
Is there a workaround ?
I'm considering opening the sealed plastic base, removing the two capacitors, cleaning the black residues and put external ones, but I need the original values. Anyone knows them ? If the second capacitor (accross the secondary) is still ok I can measure it but without the value for the first one I'm stuck unless both have the same value.
Any advise appreciated. Thanks.

 

[John James]

Have you actually contacted Mcintosh to see if they have it?

 

[clinic-audio]

Hello David

I can help you , send me a PM

 

[mnmmt]

Audio classics will rebuild it for $100, which I consider a bargain for how delicate, unobtainable, and essential it is.

 

[kaplang]

Audio classics will rebuild it for $100, which I consider a bargain for how delicate, unobtainable, and essential it is.

I had one rebuilt by audio classic for an MX110. It was well done and well worth the cost.

 

[david winter]

Thanks for your hints, that's much appreciated. Clinic Audio (who I know well and have helped me rebuilding other McIntosh gear) will take care of it.
No idea if the other transformers can fail or need to be rebuilt, but at least the sound I get over the static is really nice.

 

[kaplang]

No idea if the other transformers can fail or need to be rebuilt.

If it’s not broke, don’t fix it.

 

[Gary Follett]

Hello David

I can help you , send me a PM

What's a "PM"?

 

[clinic-audio]

Private mail