Equalizer System to Remote Reference

Equalizer 1 = 493T
Equalizer 1 = 491T (Discontinued, use 485M)
Equalizer 2 = 493C
Equalizer 3 = 493C
Equalizer 3 (date code 6G-6I) = 499T (Discontinued)
Failsafe 3 = 499T (Discontinued)