GTK Duplicating Co.

Former names

Gaiam (2000-2006)
- GoodTimes Entertainment (1984-2005)
  - Kids Klassics (1985-1996)
  - GTK, Inc. (1986-1989)
  - Unlimited Energy (1997-2002)
HGV Video Productions [Canadian] (1989-1998)
- Anchor Bay Entertainment [Canadian] (1995-1998)
  - Video Treasures [Canadian] (1989-1998)
    - Burbank Video [Canadian] (1989-1995)
    - Strand Home Video [Canadian] (1994)
    - Teal Entertainment [Canadian] (1994-1995)
    - MNTex Entertainment [Canadian] (1993-1998)
  - Starmaker Entertainment [Canadian] (1994-1998)
    - R&G Video [Canadian] (1994-1998)
Sofa Entertainment (2000-2005) (tapes distributed by GoodTimes Entertainment)
Avon (1985-1990) (tapes distributed by GoodTimes Entertainment)

Most tapes duplicated at GTK Duplicating Co. were duplicated on cassettes manufactured in either Hong Kong or Taiwan, and had the audio track in linear only, although many SP-mode tapes duplicated at this arm did have a hi-fi audio track in addition to a linear track.
Post-1986 tapes have a black screen test pattern with the 1000 Hz tone at the end.
Pre-1998 tapes have the record tab intact, while post-1998 tapes omitted it.
Certain 1997-2005 tapes were duplicated on cassettes manufactured in Korea.