Unknown Turntable belt size - how to determine?
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From: Meat Plow on 3 Jun 2010 16:25 On Thu, 03 Jun 2010 20:05:21 +0000, GregS ǝʇoɹʍ: > n article <O9idnSsjYas_aprRnZ2dnUVZ_qCdnZ2d(a)mchsi.com>, "William R. > Walsh" <newsgroups1(a)idontwantjunqueemail.walshcomptech.com> wrote: >>Hello all... >> >>I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd >>like to get the turntable going again. (Despite the source, it's a >>pretty nice stereo system...the radio tuner works well, it seems to have >>about a 40Wx2 output power rating (which seems reasonable, having looked >>at the internals), the cassette deck is a partial logic design with the >>ability to skip ahead 1, 2 or 3 songs and the turntable itself is a >>linear tracking type.) >> >>Anyway, before I stored it, the turntable was in need of a new belt. I >>set the belt aside and now it seems to be gone. I could have sworn that >>I read about how to determine an unknown belt size in the FAQ, but I >>could not find it just now. As best I remember, a string was used and >>placed around all the components driven by the belt, after which a >>measurement was taken. > > A turntable belt has a lot of stretch to it. Depends on the individual TT. I've seen belts made of rubberized fabric that didn't stretch at all. My old Rek-O-Kut TT had a belt that would not stretcch at all made of some woven vulcanized rubber stuff. Any TT with a heavy platter like the Rek-O is likely to have a stiff belt. Some of the el-cheepo tables with aluminum platter will likely have a more stretchy belt but it's not etched in stone.
From: David Nebenzahl on 4 Jun 2010 00:31 On 6/3/2010 1:08 PM Jim Yanik spake thus: > zekfrivo(a)zekfrivolous.com (GregS) wrote in > news:hu91s4$j52$1(a)usenet01.srv.cis.pitt.edu: > >> In article <O9idnSsjYas_aprRnZ2dnUVZ_qCdnZ2d(a)mchsi.com>, "William R. >> Walsh" <newsgroups1(a)idontwantjunqueemail.walshcomptech.com> wrote: >> >>>I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd >>>like to get the turntable going again. (Despite the source, it's a >>>pretty nice stereo system...the radio tuner works well, it seems to >>>have about a 40Wx2 output power rating (which seems reasonable, having >>>looked at the internals), the cassette deck is a partial logic design >>>with the ability to skip ahead 1, 2 or 3 songs and the turntable >>>itself is a linear tracking type.) >>> >>>Anyway, before I stored it, the turntable was in need of a new belt. I >>>set the belt aside and now it seems to be gone. I could have sworn >>>that I read about how to determine an unknown belt size in the FAQ, >>>but I could not find it just now. As best I remember, a string was >>>used and placed around all the components driven by the belt, after >>>which a measurement was taken. >> >> A turntable belt has a lot of stretch to it. >> >> You could do a Google search and find the belt like I >> did.............. >> http://www.vintage-electronics.cc/Pennys,_JC_(MCS).html > > OK,then after that,WHERE do you buy a new belt? > the store where I used to buy them locally has gone away. :-( Well, I'm lucky to live near Berkeley (yeah, *that* Berkeley), which still has an old-time electronics store (Al Lasher's Electronics). Been there since the 1940s, and they have all kinds of belts for turntables, cassettes and VCRs. I can't remember the name of the line of belts, but I could ask next time I go there. -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com)
From: David Nebenzahl on 4 Jun 2010 00:38 On 6/3/2010 11:42 AM William R. Walsh spake thus: > Hello all... > > I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd like > to get the turntable going again. (Despite the source, it's a pretty nice > stereo system...the radio tuner works well, it seems to have about a 40Wx2 > output power rating (which seems reasonable, having looked at the > internals), the cassette deck is a partial logic design with the ability to > skip ahead 1, 2 or 3 songs and the turntable itself is a linear tracking > type.) > > Anyway, before I stored it, the turntable was in need of a new belt. I set > the belt aside and now it seems to be gone. I could have sworn that I read > about how to determine an unknown belt size in the FAQ, but I could not find > it just now. As best I remember, a string was used and placed around all the > components driven by the belt, after which a measurement was taken. Instead of string, which does stretch, you might try a strip of paper. Which reminds me of an old turntable I used to have. As a kid in Tucson, not quite 20, I found a used turntable in a junk shop there. Cheap, because it had no belt. Took it home, and being the resourceful lad I was, I made a belt out of paper, the ends glued together with white glue. Worked great! No problems with wow & flutter or rumble. The paper belts lasted maybe a month or so before breaking. The bulb-shaped motor pulley kept the belt tracking true. Can't remember the brand, but it was an interesting turntable. Very simple: just a deck, a motor, a spindle with inner and outer platters, and an arm mounted on some kind of isolator. The arm had a single pivot. Worked really well. (My poor man's AR.) -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com)
From: GregS on 4 Jun 2010 09:07 In article <pan.2010.06.03.20.25.51(a)gmail.com>, Meat Plow <mhywatt(a)yahoo.com> wrote: >On Thu, 03 Jun 2010 20:05:21 +0000, GregS ǝʇoɹʍ: > >> n article <O9idnSsjYas_aprRnZ2dnUVZ_qCdnZ2d(a)mchsi.com>, "William R. >> Walsh" <newsgroups1(a)idontwantjunqueemail.walshcomptech.com> wrote: >>>Hello all... >>> >>>I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd >>>like to get the turntable going again. (Despite the source, it's a >>>pretty nice stereo system...the radio tuner works well, it seems to have >>>about a 40Wx2 output power rating (which seems reasonable, having looked >>>at the internals), the cassette deck is a partial logic design with the >>>ability to skip ahead 1, 2 or 3 songs and the turntable itself is a >>>linear tracking type.) >>> >>>Anyway, before I stored it, the turntable was in need of a new belt. I >>>set the belt aside and now it seems to be gone. I could have sworn that >>>I read about how to determine an unknown belt size in the FAQ, but I >>>could not find it just now. As best I remember, a string was used and >>>placed around all the components driven by the belt, after which a >>>measurement was taken. >> >> A turntable belt has a lot of stretch to it. > >Depends on the individual TT. I've seen belts made of rubberized fabric >that didn't stretch at all. My old Rek-O-Kut TT had a belt that would not >stretcch at all made of some woven vulcanized rubber stuff. Any TT with a >heavy platter like the Rek-O is likely to have a stiff belt. Some of the >el-cheepo tables with aluminum platter will likely have a more stretchy >belt but it's not etched in stone. The whole idea is isolation. All mine had loose belts. My best Thorens TD-125 was stretchy. Had a SME arm to install on it, but sold them both. greg
From: Meat Plow on 4 Jun 2010 09:27 On Fri, 04 Jun 2010 13:07:28 +0000, GregS ǝʇoɹʍ: > In article <pan.2010.06.03.20.25.51(a)gmail.com>, Meat Plow > <mhywatt(a)yahoo.com> wrote: >>On Thu, 03 Jun 2010 20:05:21 +0000, GregS ǝʇoɹʍ: >> >>> n article <O9idnSsjYas_aprRnZ2dnUVZ_qCdnZ2d(a)mchsi.com>, "William R. >>> Walsh" <newsgroups1(a)idontwantjunqueemail.walshcomptech.com> wrote: >>>>Hello all... >>>> >>>>I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd >>>>like to get the turntable going again. (Despite the source, it's a >>>>pretty nice stereo system...the radio tuner works well, it seems to >>>>have about a 40Wx2 output power rating (which seems reasonable, having >>>>looked at the internals), the cassette deck is a partial logic design >>>>with the ability to skip ahead 1, 2 or 3 songs and the turntable >>>>itself is a linear tracking type.) >>>> >>>>Anyway, before I stored it, the turntable was in need of a new belt. I >>>>set the belt aside and now it seems to be gone. I could have sworn >>>>that I read about how to determine an unknown belt size in the FAQ, >>>>but I could not find it just now. As best I remember, a string was >>>>used and placed around all the components driven by the belt, after >>>>which a measurement was taken. >>> >>> A turntable belt has a lot of stretch to it. >> >>Depends on the individual TT. I've seen belts made of rubberized fabric >>that didn't stretch at all. My old Rek-O-Kut TT had a belt that would >>not stretcch at all made of some woven vulcanized rubber stuff. Any TT >>with a heavy platter like the Rek-O is likely to have a stiff belt. Some >>of the el-cheepo tables with aluminum platter will likely have a more >>stretchy belt but it's not etched in stone. > > The whole idea is isolation. All mine had loose belts. My best Thorens > TD-125 was stretchy. Had a SME arm to install on it, but sold them both. > > greg Loose and stretchy are different things. The belt on the Rek-O was loose too and I agree that isolation from the drive is a good idea. A stretchy belt, with more stretch than what is designed, is not good for speed stability or drift.
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