I used leoina 66 then switched to Tecnifibre 515 and 416. Tecnifibre 515 was the first multi I ever played with. I also used Babolat VF and Fine Play. Gamma TNT did not come out until 1991/92. But Gamma Gut was hugely popular.
Babolat ruined VS Gut and Tonic Gut with BT7. Why change a gut string that had been perfect for 135 years? It's now overpriced garbage.