M450 · RTO-144 Connections

M450 - Program Summing Amp · ELCO 00-6007-015-940-002 · 15 contacts, single row

Rear connector

REAR VIEW · CARD EDGE · 15 CONTACTS1VCC-AUDIO +25V2N/C3SUMMING INPUT +4PROGRAM INPUT +5SUMMING INPUT −6PROGRAM INPUT −7INPUT SHIELD8GND9GAIN SET10GAIN SET11GAIN SET12OUTPUT +13OUTPUT −14N/C15VEE-AUDIO -25VInputOutputPowerGround / chassisJumperNot connected

Inputs and outputs

M450M450 - Program Summing AmpSUMMING INPUTA1 3 / 5PROGRAM INPUTA2 4 / 6OUTPUTB1 12 / 13INPUTSOUTPUTSVCC-AUDIO25 V 1 / GND 8VEE-AUDIO-25 V 15 / GND 8

Audio connections · RTO-144 A / B

PortSignalDirPin +Pin −Note
A1SUMMING INPUTin35input when used as summing amp
A2PROGRAM INPUTin46input when used as program amp
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

Source: Ward-Beck drawing 450-04-001 iss. 2 (June 1976), M450 and M450A program/summing amplifier connector layout; manual p. 15 pin out. Verify against the module before wiring.

WBS Ward-Beck Systems Ltd.
Title
M450 RTO-144 connections
Drn.
make_rto144.py
Date
Oct 22 2026