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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Question about early leadout grooves
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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,SoundsmithZephyrII+MiyajimaZeroMono, 2xAmpex ATR-102,Doshi3.0,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,
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Originally posted by astrotoy View PostNot sure, but it may be related to triggering the automatic changer mechanisms which were ubiquitous in those days. LarryTW Acustic TT with Ref motor & controller; Tri-Planar Arm; Ortofon Windfeld-Ti Cartridge, Harmonix-Combak platter matte & weight; Arcam R 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,SoundsmithZephyrII+MiyajimaZeroMono, 2xAmpex ATR-102,Doshi3.0,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),1.3KR2Rtapes,50TBrips
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