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| 1994–1999 | 1999–present |
1994–1999[]
1999–present[]
| Current members Channel 3 (HD) | Channel 5 (HD) | Channel 7 (HD) | Channel 9 MCOT HD | NBT | Thai PBS | TNN16 | True4U | One 31 | GMM 25 | Amarin TV | Nation TV | JKN 18 (TOP NEWS) | Thairath TV | Channel 8 | Workpoint TV | MONO 29 | PPTV | ETV | TPTV | Former members Associated members  |