Dapol's 2020 OO Mogul model is something of a minor revolution in internal design, with a number of innovative features to make
DCC Sound fitting easier. A pull-out PCB slots into the boiler, accessed by simply pinging off the press-fit boiler door.
This pull-out PCB has a Next18 socket, ready to take a Zimo MX658N18 sound decoder on the top, and a 15x11mm speaker component
underneath, housed in a chamber (supplied with the model). The chamber simply clips into the PCB allowing the speaker's
spring-clip terminals to touch contact points on the PCB, so no soldering required.
In addition, the model has a pair of LEDs for firebox glow effect (yellow and orange).
Connection to the tender is via a new style solid contact bar, which is spring-loaded both sides, giving 4 electrical paths...
2 for tender pickups and 2 if you want to place a larger speaker in the tender instead of in the boiler.
Not only is it very welcome to see these features, but the model is also very well put together, and motion is smooth and quiet
- first impressions are very impressive.
Kit: MX658N18; 15x11mm StickyGasket Speaker
We'll start with the easy approach, putting the intended 15x11mm speaker in the supplied chamber in the boiler with the
decoder... you can see the supplied chamber here, as it is desinged to clip onto the underside of the PCB.
We didn't need to take the body off the chassis, but were just nosey to find out how much extra space there might be, and to
see the plug-in socket.
Here is the 15x11mm StickyGasket speaker component ready to go into the chamber.
The MX658N18 will just plug straight into the PCB on the top side.
Backing peeded off the speaker and inserted into the chamber - no need for any glue - it fits perfectly.
Slotted back together and testing... again, remember you don't need to remove the body - we were just being nosey!
Here is the assembly in position within the boiler - very neat design.
Perhaps the most disappointing aspect of the model is that you can barely see the firebox lights through the cab aperture. Sad,
because the LEDs themselves are actually quite bright. Simple solution though - a bit of foil from a KitKat wrapper to reflect
it out, makes all the difference!
Kit: MX658N18; Zimo Dumbo LS26X20X08-1W
Ok, so that was easy, but the volume from the little 15x11mm speaker is only 'adequate'... if you are wanting more volume, and
some grunt/depth to the chuff sounds, then you need to ditch the speaker from the boiler and put something a bit meatier in the
15x11mm speaker comes out (you cannot use 2x 8ohm speakers with the Zimo MX658N18, which needs 1W and 8ohms... if you have both
speakers, then it will end up 2W and 4ohm, which is not compatible, and you'll eventually damage the decoder.
We've gone with a Zimo Dumbo LS26X20X08-1W here, which fits with room to spare, but sounds really good...
Some double-sided tape to hold it in place underneath and toward the rear...
Solder the speaker to the model's pre-routed wires, which is a piece of cake, and off we go... hear the difference! The sound
is substantially better than the boiler speaker.
Here is the completed model, back together, looking very handsome... well done Dapol - good job indeed!