[QuadList] Servo Modes

[Don Norwood]

Hi Chris:

I have a VR-1200 that has a mod so that in H-lock mode, it functions exactly as you have described for the RCA LineLock.  It's a small circuit board added in the control panel.  Basically an NE555 timer controlling mode selection when Play is activated and the servo selector is set for H-lock mode. 

Don Norwood
Digitrak Communications, Inc.
www.digitrakcom.com  

----- Original Message ----- 
  From: Chill315 at aol.com 

  RCA offered four modes of lock, Pixlock, LineLock, Switchlock, and TW or Tone Wheel.

  Pixlock was the same as Automatic in the Ampex Machines.  Linelock starts in full automatic and then after lock reverts to the same as Horizontal, Switchlock was vertical lock, and TW is the original servo system.

  RCA did have the advantage with LineLock that it would always lock vertically for a clean switch and then if there was a problem, have a fast servo recovery.
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