Heljan's update to their Class 33 OO diesel now comes with a 21pin DCC socket, so MS440C is the decoder here. However, little
provision is made for a speaker so we opt for a Lurve8 which just fits on top of the circuit board under the roof. An
alternative may have been possbile in the fuel tank, but this sound reasonable and is an easy fit.
Shown here with the blanking plate still in before installing the DCC Sound kit.
The speaker connection is via a 2pin socket hiding underneath the decoder area. Heljan have helpfully provided a plug for this
with flying wires (red and white).
Photos courtesy of Peter Tisdale, Intercity Models
Please note that these guides are provided as useful resources for you, as-is. YouChoos cannot be held responsible for
errors in the information, or for any damage caused to your models or equipment if you choose to follow any of the
steps detailed here.