GTK Duplicating Co.

List of Customers

 * GoodTimes Entertainment
 * Kids Klassics
 * GTK Home Video
 * Unlimited Energy
 * Sofa Entertainment (2000-2005)
 * HGV Video Productions (Canada) (1989-1998)

How to Tell

 * Most tapes duplicated by GTK Duplicating Co. were duplicated on cassettes supplied by Polaroid Corporation and manufactured in either Hong Kong or Taiwan.
 * Post-1986 tapes have a black screen test pattern with the normal-pitched looping beep-tone.
 * Pre-1997 tapes have the record tab intact, while post-1997 tapes omitted it.
 * Certain 1997-2005 tapes were duplicated on cassettes manufactured in Korea.