[Vintage-Audio] Help! Sony Turntable Croaks!

[Duane Fischer, W8DBF]

Using Phil's method, the length is exactly 13 inches times two, or twenty-six.

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From: Phil <k06bb@elite.net>
To: vintage-audio@mailman.qth.net
Subject: Re: [Vintage-Audio] Help! Sony Turntable Croaks!
Date: Monday, July 15, 2002 7:27 PM

Hi again...
Belts, as used in turntables, tape decks etc are 'normally' measured by
their inside circumference, in inches, not diameter.  So, you can measure
the diameter and use the formula to convert to circumference OR, easier is
to lay the belt down flat on a ruler and measure it's length, then multiply
by two to get it's true circumference. This is the method that I use, except
that I use a belt measuring tool that you slip the belt over to measure.

I suspect that a FRM 10.5  0r 12.7 will be way to small for said turntable
as their circumference will only be 10.5 or 12.7 inches.

    _  _
   (_\/_)
   (O  O)   .## 'It may be raining,
    \ ^/  .'.(\  but there's a rainbow above you...'
   .-`'_.'.' ||       -The Eagles
 ,' .-'.'\_-'/
( -<, ' _/_-'
  \__.' _|
  / /\_/ )      Phil, KO6BB
 ('(  | /       REAL Radios "Glow in the dark.
  \ \ |/        REAL Music is played through
   ) \|\_       'VALVE' Guitar Amplifiers.
   \_/\_/
    "  "


> 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.


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