by Record-changer »
Tue Nov 28, 2006 7:52 am
Prewar record changers had tracking forces much heavier than postwar ones. Acoustic players had forces measured in POUNDS. By WW-II, the forces had been reduced to one or two ounces (35 to 70 grams equivalent).
Because of these high tracking forces, arms didn't have the precision we see today. They were often stiff as a form of antiskating.
Like I said, many prewar phonographs were modified during the war. The knife-type changers broke the new records, so most owners either took off the changing parts, used the player manually, or had a push-type changer installed. Webster had made more push-type changers than other manufacturers at the time production stopped for the war, so Websters were used more for replacement changers.
Zenith had its own record changer division, so other changers were used only during the wartime shortages.
To see examples of turnover, throwoff (slide-type), knife-type, and push-type changers, go here:
http://geocities.com/midimagic@sbcglobal.net/changers.htm
My new record changers site is now up. I am working on the record equaliation pages.