How many movies have L. Balu and T. R. Sundaram collaborated on?

They have worked on 6 movies together! Their first movie together was 1000 Thalaivangi Apoorva Chinthamani (1947) while their highest rated movie together was Alibabavum 40 Thirudargalum (1956). They have not worked together since CID Shankar (1970).