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-   -   Audiotronics model 400 transcription record player (http://www.videokarma.org/showthread.php?t=267530)

radiotvnut 08-06-2016 11:53 PM

Audiotronics model 400 transcription record player
 
Here's an Audiotronics model 400 4-speed transcription record player/PA system from '64 and it will play records up to 16" in diameter. It needed the usual mechanical clean-up and re-lubrication; but, the amp was fine and it now works well. The only issue is that the 78 tip on the 89T cartridge is shot and I need to get another one; but, the old style LP/78 Astatic 89T cartridges are getting scarce (and costly). The tube line-up is 6CA4, 12AX7, and 6BQ5. For a little single-ended amp that's good for about 5-6 watts, it has plenty of volume (it will really be interesting when I finally get around to restoring my Newcomb transcription player with four 6V6's in it).

http://i538.photobucket.com/albums/f...pso4i0woe8.jpg

http://i538.photobucket.com/albums/f...pssgnmk6o4.jpg

http://i538.photobucket.com/albums/f...psqhhsc5fl.jpg

maxhifi 08-07-2016 12:31 AM

How does that continuously variable speed work mechanically? It looks like it has a neon bulb with a mirror to show a strobe pattern printed under the turntable? Never seen anything like it, is it
Visible with larger records? Very cool unit, I like the sound a single 12" speaker makes, and looks quality inside and out.

radiotvnut 08-07-2016 12:56 AM

There is a round metal disc that is attached to shaft of the motor (coming out of the bottom of the motor). When the lever is moved, it moves a magnet close to the disc and the magnetic field alters the motor speed.

maxhifi 08-07-2016 09:06 AM

Oh, that's an eddy current brake , there must be a 33/45/78 selector somewhere I can't see. I thought it was a continuously variable speed control.


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