stupid question about turntables

jteef · 11th October 2001, 04:24 AM

How do you get stereo sound from a vinyl record and a turntable?

Not even sure if this belongs here, but never having owned one, I am not exactly sure how they work other than a moving coil connected to a needle sliding up and down and outputting a corresponding signal. Where does the other channel come from?

Again, sorry if this is so stupid, but it doesn't seem obvious to me right now.

thanks

jt

GRollins · 11th October 2001, 05:01 AM

jteef,
Generally speaking, after about 1957 all records were recorded in stereo. For a while there were mono and stereo versions of the same records, but by the late '60s this was pretty much a thing of the past.
Stereo records are recorded with a V-shaped groove. The modulations on one wall constitute one channel. A stereo cartridge doesn't detect the signal by moving straight up and down, but more at a 45 degree angle (for one channel). The magnets and coils are positioned such that the 45 degree motion causes a signal in one set of coils or the other, depending on which way the stylus is moving. Obviously, the motions get pretty complex, but in practice it works quite well indeed.

Grey

jteef · 11th October 2001, 05:11 AM

makes sense...I dont think i'd want to be the one calculating all that stuff though.

Thanks a lot

jt

Pete Fleming · 11th October 2001, 02:21 PM

Yeah, that's one reason the channel separation for LPs doesn’t come close to that achievable with CDs. Physically just doesn’t work.

Cheers,

Pete

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11th October 2001, 04:24 AM	#1
jteef diyAudio Member Join Date: Feb 2001 Location: Ogden, UT	How do you get stereo sound from a vinyl record and a turntable? Not even sure if this belongs here, but never having owned one, I am not exactly sure how they work other than a moving coil connected to a needle sliding up and down and outputting a corresponding signal. Where does the other channel come from? Again, sorry if this is so stupid, but it doesn't seem obvious to me right now. thanks jt

11th October 2001, 05:01 AM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	jteef, Generally speaking, after about 1957 all records were recorded in stereo. For a while there were mono and stereo versions of the same records, but by the late '60s this was pretty much a thing of the past. Stereo records are recorded with a V-shaped groove. The modulations on one wall constitute one channel. A stereo cartridge doesn't detect the signal by moving straight up and down, but more at a 45 degree angle (for one channel). The magnets and coils are positioned such that the 45 degree motion causes a signal in one set of coils or the other, depending on which way the stylus is moving. Obviously, the motions get pretty complex, but in practice it works quite well indeed. Grey

11th October 2001, 05:11 AM	#3
jteef diyAudio Member Join Date: Feb 2001 Location: Ogden, UT	makes sense...I dont think i'd want to be the one calculating all that stuff though. Thanks a lot jt

11th October 2001, 02:21 PM	#4
Pete Fleming diyAudio Member Join Date: May 2001	Yeah, that's one reason the channel separation for LPs doesn’t come close to that achievable with CDs. Physically just doesn’t work. Cheers, Pete