[Vintage-Audio] Help! Sony Turntable Croaks!

[Bob]

There is something wrong with the dimensions. For a table
diameter 6 inches and a motor offset from the center of the
table by 4 inches results in a belt of length 20
inches...For 13 inch belt length, the big diameter must be
about 3 inches with a 3 inch offset (12.5 inches) this is
not what Duane described. 

The formula is approximate....L=2.14*D+2*S

Bob


Bob wrote:
> 
> Well I find a FRM-10.5 and a FRM-12.7 that are 0.210 x
> 0.031.and a FRM-9.6 which is skinny. I can tell which one
> with the model number. But there is hope that the 13 inch
> you measured is OK and you just gotta figure out where it
> goes.
> 
> WBob
> 
> "Duane Fischer, W8DBF" wrote:
> >
> > Bob,
> >
> > This belt is about .25 wide and has a diameter of 13 inches.
> >
> > It does not fit around the underside of the rim of the platter, but on a smaller
> > circle about two thirds the size of the platter.
> >
> > Is the speed changed by the belt being moved by these mechanics or by the speed
> > of the motor changing? The buttons do raise a piece of metal higher when the
> > speed changes from 33 1/3 to 45 rpm. Can't see how that would take up much
> > tension though.
> >
> > As soon as somebody is here who can see to read, I will check the plate on the
> > back for a model number. There is nothing obvious, as I had someone check
> > before.
> >
> > Duane
> >
> >
> > ----------
> > From: Bob <wolfbob@csnsys.com>
> > To: vintage-audio@mailman.qth.net
> > Subject: Re: [Vintage-Audio] Help! Sony Turntable Croaks!
> > Date: Monday, July 15, 2002 5:56 PM
> >
> > Duane..
> >
> > Cant find any Sony TT with numbers like that. If it is a rim
> > drive belt odds are it is a FRX-23.6 a flat belt 23.3 x
> > 0.185 x 0.030 inches. That belt is pretty skinny, 0.185,
> > most TT belts are 0.25 or so. Sony had a lot of
> > combinations, but the FRX-23.6 was the most common long
> > belt.
> >
> > WBob
> >
> > "Duane Fischer, W8DBF" wrote:
> > >
> > >
> > > Today I went to play an album and the Sony turntable was not working. Worked
> > > just fine a few days ago. Hmmm. Platter was not moving. So the old blind dude
> > > stupidly stuck his left index finger in one of the three large holes in the
> > > heavy metal platter and 'looked' around.
> > >
> > > If the new antibiotic Lebaquin for an UTI disagreeing with me was not enough
> > to
> > > make me miserable,  I discovered that the drive shaft was still turning in the
> > > turntable! Darn near drilled a hole in my Braille finger. I also noted that
> > the
> > > belt was off. So I powered it down and removed it from the console.
> > >
> > > The belt is not broken, seems pliant, but is way too long. I mean, three
> > inches
> > > too long. This is not just a case of stretched, as it could not possibly have
> > > run the last time with a belt that was this sloppy. Now I reason there must be
> > a
> > > tension adjustment for this belt, but i sure can not find one.
> > >
> > > Do any of you have any suggestions? This turntable I purchased new in 1974. I
> > > did replace the belt about eight years ago. It has had some use each month.
> > >
> > > The only number I have written down is MD 88858.
> > >
> > > Duane W8DBF
> > >
> > > _______________________________________________
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> > > List Administrator: Duane Fischer, W8DBF
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