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Hornby R8120 Twin Pack TTS Sound Decoder Class 43 (MTU) OO Gauge

Hornby R8120 Twin Pack TTS Sound Decoder Class 43 (MTU) OO Gauge

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3 in stock


Hornby R8120 Twin Pack TTS Sound Decoder Class 43 (MTU) OO Gauge

IMPORTANT – The decoder does not support sound under DC (analogue) operation. Sounds can only be played under DCC (digital) operation. This applies to all sounds, both running and spot sounds. The locomotive’s motor may be controlled under DC operation.

Function list

F0 Headlight/Rear-Light

F1 Engine Start/Stop

F2 Horn High-Low

F3 Horn Low-High

F4 Brake Squeal



F7 Return to IDLE

F8 Thrash

F8 Cold Start Override

F9 Compressor

F10 Cab Door Slam

F11 Fan

F12 Horn Long High

F13 Horn Long Low

F14 PrimerSlow Flange Squeal

F15 Spirax Valve

F16 Horn Short Low

F17 Horn Short High

F18 Windscreen Wipers

F19 AWS TestFire Bell Test

F20 Guards Whistle

F21 Guard to Driver Buzzer

F22 Aux Lighting


Please note this item includes two Class 43 TTS Sound Decoders

Hornby TTS decoder installation guide Installation guide


– Supports short and long decoder addresses

– Adjustable acceleration and deceleration

– Back EMF load compensation

– Up to 19 controllable spot sounds dependent on model including whistles or horns etc

– Two sound channels allowing for simultaneous play of full locomotive engine sounds, & individual spot sounds e.g. horns, whistles, brakes, wagons coupling etc. NOTE: Only one spot sound can be played at the same time

– It is possible to alter the volume of each sound through an individual dedicated CV. Range 0-8

– Decoder is equipped to support directional front and rear lighting operation via F0 on the controller, providing that the product is fitted with lights

– The decoder is equipped with 1 aux function output controlled by F18 or F25 dependent on locomotive type (diesel or steam)

– Motor current – maximum continuous 500mA

– Motor current – peak 1amp (no function load)

– Function output current maximum—100mA (unprotected)

– Decoder current maximum continuous – 800mA (shared motor and functions)

– Number of sound channels – 2

– Termination – 8 pin plug NEM652. NMRA

Additional information

Weight 101 g