NTP 277-400 B
Pin 10 +Audio input L
Pin 11 +Audio input R
Pin 12 Power supply 0V
Pin 13 Ground
Pin 14 -Audio input R
Pin 15 -Audio input L
Pin 23 Power supply +24VDC
NTP 277-500
1 = +22 to 32V
2 = 0 V
3 = Chassis
4 = AGC OFF
5 = Screen
6,7 = balanced input left
8 = Screen
9,10 = balanced input right
