Haunted House

Replacing Haunted House Lower Playfield Illumination Lamps with #44 Lamps

This modification documented by Chris Hibler, based on Black Hole mod developed by Steve Charland.

When Gottlieb® designed Black Hole and Haunted House, the designers chose to illuminate the lower playfield with 313 lamps, which are 28 volt lamps. Coil power could be used as a power source, and the lamps are slightly brighter than #44 lamps. However, #313 bulbs are triple the price of #44 lamps and are a unique part to stock.

Converting the power circuit that drives these lamps to 6VDC makes sense and allows the use of the more common #44 lamps.

Overview of the mod

The big picture...

Modifications at the "U" relay. Desolder the 24VDC power supply wire (388) and cap it off.

U relay mods...
Remove the...

Solder a new 16 gauge wire to the vacant solder tab where 388 wire was removed.

The schematic representation of the modification. The 388 wire will be removed, capped, and replaced with a connection to 6VDC.

Attaching to the power bus...
Solder the...

Use "zip ties" to secure the new wire to the factory wire bundle. You can feed the wire through the factory "tie downs".

All done...

Let there be light...
All finished with the mod. The bulbs now will light on 6VDC instead of 24VDC. Swap out all of those #313s with #44s or #47s and never worry about looking for the correct bulb again.