Twin Pack TTS Sound Decoder: Class 43 (MTU)

Twin Pack TTS Sound Decoder: Class 43 (MTU)


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Twin Pack TTS Sound Decoder: Class 43 (MTU)


Item Code: R8120

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| Description

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
  • F5     NOTCH Up
  • F6     NOTCH Down
  • F7     Return to IDLE
  • F8     Thrash
  • F9     Cold Start Override
  • F10   Compressor
  • F11   Cab Door Slam
  • F12   Fan
  • F13   Horn Long High
  • F14   Horn Long Low
  • F15   Primer
  • F16   Slow Flange Squeal
  • F17   Driver's Safety Device (in Cab)
  • F18   Horn Short Low
  • F19   Horn Short High
  • F20   Windscreen Wipers
  • F21   AWS Test (in Cab)
  • F22   Fire Bell Test
  • F23   Guards Whistle
  • F24   Guard to Driver Buzzer (in Cab)
  • F25   Aux Lighting (if used in locomotive) 


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


Hornby is a household name and is famous as the UK's brand leader in the model railway hobby with its high quality 00 gauge (1:76) models and accessories.

% Safety Notice

y Technical Specification & Detail

Age Suitability 14+

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