phonograph motors.

[cfz2882]

seen a lot of different types of motors and drive mechanisms used to rotate our turntables
-springwound with mechanical governor used on the antique phonos.
-shaded pole with worm drive,sometimes a friction speed adjust is included-see this on some 30s-mid 40s 78 rpm phonos.
-shaded pole with idler wheel drive.
-shaded pole with magnetic synchronizer ring so motor will run synchronized to line frequency once at speed-my dual 1229 has this,seen on other mfg also.
-PM DC with mechanical governor
-PM DC with electronic feed back speed control.
-direct drive electronic driven
-split capacitor synchonus,belt driven-my 74 empire is this arrangement
-single syncronus timer type motor-this was a '70s us made turntable.
-twin syncronus timer motors,belt driven
-direct drive eddy current disc motor(like a watthour meter)seen on a late 1920s radio phono-might have been RCA.
-also have a really weird antique DC motor apparently from a battery operated phono-no country of origin,but metric threads-so I think it might be German-if I can locate this out in my garage will investigate further

 

[mathewhebailey0]

adjustable friction spped on 1950's Zenith Cobra-Matics

 

[tolivac]

The adjustable cone-friction drive was used on Bogen single play TT's these most often seen with their PA and dance school equipment.Worked on one of those Bogen TT's that was used by a dance school.A Zenith Cobramatic owned by a freind--he needed a replacement idler drive wheel to go the cone shaped motor shaft-found his slot car slick wheels-put one of those on the idler wheel tire shaft---BRAVO!!!!Zenith TT then worked!!!That slot car "racing slick" was just the right size and hardness.Can't remember what scale his cars were.The wheel was there-so grabbed it and tried it.That zenith TT was in a zenith hi-fi console-was pink in color and two very miniature light bulbs in the tonearm headshell served as the snakes "eyes" they glowed when the TT was being used--kinda cool!Those lights were in the days before LEDS.

 

[tolivac]

Can't remember the model offhand--RCA broadcast TT's made during the 40's,50's were gear driven from a Bodine Syncronous motor-the gear drive looked sort of like a washer transmission.You shifted speeds by shifting gears!The motor ran at one speed.Never had a lick of trouble with one of these other than tonearm adjustments,stylus-cartridge replacement.They played 33,45,78 RPM.And they had cue markers on the TT rim so you could properly cue a record properly-a marker for each speed.The platters were over 16" diameter so they could play the 16" transcription records common in those days-those records had programs,commercials and promos recorded on them.they did the job a cart machine did later.Have a few of these.Radio stations had the disc recorder "lathes" so they could record these.Those RCA TT's are liked by broadcast equipment fans.Some audiophiles like them,too!They were built to last!!!