M450A · RTO-144 Connections

M450A - Program Amplifier · ELCO 00-6007-015-940-002 · 15 contacts, single row

Rear connector

REAR VIEW · CARD EDGE · 15 CONTACTS1VCC-AUDIO +25V2N/C3N/A ON M450A4PROGRAM INPUT +5N/A ON M450A6PROGRAM INPUT −7INPUT SHIELD8GND9GAIN SET10GAIN SET11GAIN SET12OUTPUT +13OUTPUT −14N/C15VEE-AUDIO -25VInputOutputPowerGround / chassisJumperNot connected

Inputs and outputs

M450AM450A - Program AmplifierPROGRAM INPUTA2 4 / 6OUTPUTB1 12 / 13INPUTSOUTPUTSVCC-AUDIO25 V 1 / GND 8VEE-AUDIO-25 V 15 / GND 8

Audio connections · RTO-144 A / B

PortSignalDirPin +Pin −Pad +Pad −
A2PROGRAM INPUTin46——
B1OUTPUTout1213——

Power · bench PSU

RailStyleVoltsMax ASupplyGroundLink
VCC-AUDIO—25—18—
VEE-AUDIO—-25—158—

Other pins

SignalPins
INPUT SHIELD7
COMMON8
GAIN SET9, 10, 11
N/C2, 14
N/A ON M450A3, 5

Source: Ward-Beck drawing 450-04-001 iss. 2 (June 1976), M450 and M450A connector layout ("summing amp input N/A for M450A"). Verify against the module before wiring.

WBS Ward-Beck Systems Ltd.
Title
M450A RTO-144 connections
Drn.
make_rto144.py
Date
Oct 22 2026