This installation is for a HO Scale Bachmann Spectrum 4-6-0 using a TCS WOW121 Steam Decoder, B-MB8 Motherboard with built in Keep Alive®
and 20mm WOWSpeaker.

This was performed by our friends from DCC Xpress installations.
They offer high quality WOWSound installations for a flat rate complete with free return shipping!
You can find them at:

These items are available in the WSK-BAC-8 which was used for this installation.
B-MB8 Motherboard with Keep Alive™ WOW121-Steam Decoder 20mm WOWSpeaker
Click here for more information on the WDK-BAC-8 and the rest of the WOWSteam Kits line.

Important Soldering Tip:
Please do not use any flux either liquid or paste on the mother board. It will damage it. Use only Rosin core solder approved for electronics use.
We recommend to use only Kester "44" rosin core, SN63PB37, .015" diameter, part number 24-6337-0007.
This can be ordered from Techni-Tool under Techni-Tool part number 488SO157


Bachmann Spectrum 4-6-0 Steam prior to installation.

To begin this installation, separate the locomotive from the tender by disconnecting the two plugs located under the rear of the locomotive as highlighted above in red.

To remove the shell from the tender, first remove the two screws highlighted above in red, one from the coupler and the other in the middle of the shell underneath the truck assembly.

Shown with the shell off. Remove the single screw highlighted above and set it aside for reinstallation.

The wire leads shown connected to the original lighting board. Make a note of the function of these wires and their location.
Disconnect these wire leads and remove the board from the tender chassis. Save this screw for installation of the new motherboard.

With the original lighting board removed, trim, tin or lengthen the wires as necessary. Using small lengths of TCS 3/32" and 3/64" shrink tubing, insulate these solder leads.

Using the saved screw, test fit the B-MB8 motherboard to the chassis and mark out drill hole locations for speaker venting.
NOTE: Take care to avoid drill positions where they would interfere or damage underside components.

Show with the speaker porting holes complete. Carefully remove any burrs that might damage the speaker or the underside components.

Using small dabs of hot melt glue, create a series of small raised 'gasket' dots to raise the speaker slightly, and with this glue, create a seal for the speaker down on to the chassis.
Solder the wire leads to the motherboard according to the included wiring diagram.
NOTE: You must be very careful to avoid getting glue on the speaker cone. Glue on the speaker will ultimately cause it to produce no sound and fail.

Using the original saved screw, attach the BMB8 motherboard to the frame and solder the track, motor, and lighting wire leads to the B-MB8 according to the included wiring diagram.

You can now plug in your WOW121 steam decoder.

Lastly, in order to keep the wires neat and prevent possible shorts, lace the wires into a bundle using lacing cord, which is a wax impregnated string 
used for wire bundling and making harnesses. There are many choices of lacing cord available from Digikey
We use part number 802534B BK032-ND

Now you can close up the tender, locomotive and reinstall the coupler and connection assemblies. Be sure to be mindful of wire routing and reassembly of the shell as to not damage 
or foul the installation. Your Bachmann Spectrum 4-6-0 is now WOWSound equipped and ready to roll!

Other solder tips: When stripping wire, only strip a tiny little bit of the insulation. Strip no more then a 1/64 of an inch. When the wire gets tinned with solder the insulation will shrink back more. Try to not expose any more wire then half the length of the solder pad at most. In no case should solder or exposed wire wire ever be outside the boundary of the the solder pad you are attaching a wire to.
Click here for important information on properly Stripping and Tinning wire

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