Check the listing for details. Promax GV-698+ PAL/NTSC/SECAM TV Pattern Generator. Condition: Used. Listed at 900.00 USD. Compatible with PAL, SECAM and NTSC systems. The GV-698+ is a TV pattern generator with excellent price / performance ratio which is especially suitable for service of all kinds of TV receivers. It is also possible to turn ON or OFF the colour burst, the sound subcarrier, the colour subcarrier, etc.