Yes, MAS do not have PTVs in their A330. This is because their A330 is quite old and I am not too sure if they are phasing out their aircraft soon, since they are going to have a lot of aircraft parked this coming Summer 2002 schedules. However, they only fly A330 to certain destinations in Asia, eg Osaka, Nagoya, Fukouka, Madras, Delhi, Male, Dhaka etc.
But if you are flying with MAS on long-haul, there is bound to be PTVs in the Economy. Only their B747-Combi does not have PTVs as all the other B747-400 passenger only version and B772 are all equipped with PTVs. Their B747-Combi is due to be phased out this February/March 2002. There are rumors that MAS is considering to replace their agin B737-400 with B737NG or the Airbus A320 family. But due to the economic situation, I don't think they are going to do so for a couple of years to come!