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Back in the late fourties and early fifties some LPs have leadout grooves that are non concentric where the tonearm "waves" in and out at the end of the record. Whereas modern LPS have concentric leadout grooves where the tonearm remains relatively stationary locked in a circle at the end of play. Anybody know what the early method was all about and why did it change?
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Not sure, but it may be related to triggering the automatic changer mechanisms which were ubiquitous in those days. LarryAnalog- VPIClassic3-3DArm,Lyra Skala+MiyajimaZeroMono, 2xAmpex ATR-102,Otari MX5050B2,Merrill Trident Master Tape Pre,Herron VTPH-2A
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Werent those spiral lead outs on 78s which would have preceded auto lift and shut off?Originally posted by astrotoy View PostTurntable: TW Acustic TT with Ref motor & controller; Tri-Planar Arm; Ortofon Windfeld-Ti Cartridge, Harmonix-Combak platter mat & weight; PS Audio Stellar Phono Preamp; KLAudio Ultrasonic Record Cleaner.
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According to wiki, the autochanger TT's started in the late '20's, because of the short playing times of the 78's. They continued through most of the LP's era, until the late '80's.
LarryAnalog- VPIClassic3-3DArm,Lyra Skala+MiyajimaZeroMono, 2xAmpex ATR-102,Otari MX5050B2,Merrill Trident Master Tape Pre,Herron VTPH-2A
Dig Rip-Pyramix,IzotopeRX3Adv,Mykerinos,PacMicroModel2
Dig Play-mchNADAC, LampiPac, Roon, HQP, Oppo105
Electronics-Doshi Pre,CJ MET1mchPre, Cary2A3monoamps
Speakers-AvantgardeDuosLR,3SolosC,LR,RR
Other-2x512Engineer/Marutani Symmetrical Power, AudioDiskVinylCleaner,AirTightRecordFlat, Scott Rust Interconnects,
Music-15KRecs(90%classical),1.7KR2Rtapes,50TBripsComment
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The ones that make me nuts are the lead-outs with no lock that drives the arm/cart right into the paper label. It makes me cringe, drag out the optics to check the stylus, etc. Oughta be a law...Comment
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