McIntosh MR71 FM Receiver Video #1 - A Thorough Checkout

I've been trusted with a McIntosh MR-71 FM receiver that was brought out of storage and found not to be working. After some careful looking, I cautiously power it up to see if I can get it to work to any degree.

[Lesman_Tech]

Old tech 313 is equivalent to MDL (time delay) and the value is 3.2 A. IE. (that is) 3 plus 2/10 of an see it all the time. Great video... thank you.

[tommybewick]

That fuse looks like the electronic tracker bug that was put in Neo in the movie, The Matrix.

[LestonDr]

I have been using this model tuner since 1978. The RF connector on the back should be an F-connector, someone must have changed it to an BNC

[tomzielinski]

Older thread but, you should not be working on this tuner. Qualified McIntosh repair center is the obvious answer here. All do respect to you sir, but you sound lost with this tuner. And this mr71 is a audiophile iconic legend. No disrespect intended, hope it worked out for you. Thanks for posting, very entertaining. :)

[siskokidd]

A friend of mine has a variant of that unit. It has bass, treble and balance controls, plus 2 phono inputs. When we first met, he mentioned it had a problem with one of the channels cutting out after 5 to 10 minutes, but only when using his turntable. We made all sorts of assumptions and guesses, all of them costly, but the problem ended up being the #1 phono circuit. A simple switch of the wires to the #2 phono input jack solved the problem. #1 still has a problem, but #2 works fine.

[graemedavidson]

Also worth checking the local oscillator is running...

[tommybewick]

Fm is always a challenge, frankly I'm clueless. I got to see one of Armstrong's first experimental fm receivers at the antique radio museum in Bloomfield, NY, very cool to see.

[ruawhitepaw]

I'm surprised that a high end radio from 1965 would still use tubes. Were transistors not commonplace by that time?

[DAVIDGREGORYKERR]

Nuvistor Vacuum tube is what that tiny tube is and is used to boost the RF before it feeds the tuning circuits, I think you will have to find a new Nuvistor Vacuum tube, if you have an old Ribbon microphone it will have a Nuvistor Vacuum tube and if you can get it out you might be in luck.

[umajunkcollector]

for what a big Mac costs, nothing should go wrong with it.

[jime]

i think McIntosh was probly as high end as '60s gets

[jime]

Bang & Oulefsen mighta had a fistfight w/ Marantz