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Trident TSM took over from the A range as the top of the Trident range of studio consoles. There were only 13 A ranges manufactured, 4 of which ended up in Cherokee Studios in Los Angeles, America's top studio according to George Martin in the 70's.
This TSM replaced an A range at Chipping Norton Studios in 1980, the Chipping Norton A range can be seen with a 40 channel Trident B range, Ex Sarm Studios, in an old Don Larking Audio Sales advert.