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MR-74 Dial thread Broke!

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Posted on October 23, 2016 at 21:33:19
6bq5
Manufacturer

Posts: 2160
Location: SF Bay
Joined: August 16, 2001
Contributor
  Since:
September 14, 2012
Changing stations late Friday evening and the dial started to spin- but the needle did not - and I got stuck on something in between KPFA and KALW...
Took off the cover - and saw that one of the THREE dial threads was broken - but in that there are three - the tuning wheel (attached to the variable capacitor) was still connected to the needle - so I gently tuned in 91.7 - KALW.

Saturday I took the unit out to repair - what a project:
Removed guard- done Friday - now take off the knobs,
Outer Glass faceplate-
Inner glass face-plate - well - not quite off - but disconnected enough to tip forward so that I could get in to replace the thread-

Thankfully I had a second to make sure I got it correct-

I know - I should have taken pictures - if only to share

All back in business again but the dial / needle /station alignment is not quite right - a smidge to the left...

next time I'll do better-
Happy Listening

 

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RE: MR-74 Dial thread Broke!, posted on October 24, 2016 at 20:30:40
dirtyvinyl
Audiophile

Posts: 1732
Joined: December 10, 2011
A recent purchase is a 65-9ish MR71. Any warning signs prior to?
I CAREFULLY/slowly tune stations in. While the "feel" is still smooth and quiet, I'm aware anything can fail in a 50 year old tuner.

I couldn't imagine trying to restring the dial. Seems like an excercise in patience and fussing.
Something that would have to be done by a shop for me.

 

RE: MR-74 Dial thread Broke!, posted on October 25, 2016 at 09:39:41
6bq5
Manufacturer

Posts: 2160
Location: SF Bay
Joined: August 16, 2001
Contributor
  Since:
September 14, 2012


It is not a job for the faint-of-heart, that I can attest to-

here are some pictures of the unit operating with the new red thread-

No there was no warning sign - just broke-
I do have a good tech in the area and would have gone to him- but wanted to see if I could get it done myself-

the last picture shows the 'dial indicator needle electrification in detail-













Happy Listening

 

RE: MR-74 Dial thread Broke!, posted on October 25, 2016 at 10:03:04
Michael Samra
Dealer

Posts: 35578
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
You did put a new string on,correct?

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: MR-74 Dial thread Broke!, posted on October 25, 2016 at 10:14:57
6bq5
Manufacturer

Posts: 2160
Location: SF Bay
Joined: August 16, 2001
Contributor
  Since:
September 14, 2012
Yes- the Red string is new- it replaced the original Black string-

Happy Listening

 

RE: MR-74 Dial thread Broke!, posted on October 25, 2016 at 13:35:29
dirtyvinyl
Audiophile

Posts: 1732
Joined: December 10, 2011
Oh my....it looks complex if you don't have a clue(myself)

The pics are a reminder what I did in the early 80's. I was that copier repair guy who would stroll into your office to fix that damn copier which jammed all the time!
Now and then I would restring the lamp assembly which scans the original. Talk about an electro mechanical mess!

Nowadays, I avoid tasks that involve more than use of a screwdriver.


 

How nice, posted on October 27, 2016 at 12:59:46
Awe-d-o-file
Manufacturer

Posts: 16818
Location: 100 miles west of DC
Joined: January 10, 2004
Contributor
  Since:
October 31, 2005
To get KPFA over the air.


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

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