AGC in English 405 lines positive modulation sets...

[ppppenguin]

All the TV system parameters are conveniently available here: https://en.wikipedia.org/wiki/Broadc...vision_systems

The following used +ve vision:
A: UK 405
C: 625. Early, discontinued in 1977
E: France 819. Full BW
F: Belgium 819. Reduced BW
L: 625. Last surviving +ve system. France until 2011.

Belgium probably had the most need for complex multistandard sets as they could receive signals from several countries.

+ve vision systems all used AM sound though this wasn't an engineering requirement. +ve systems can't use intercarrier audio as the vision carrier falls to zero at sync tips.