I was looking at the schematics, datasheets, and online discussions about the 6118 and gottlieb glass and how to test them.

First the glass: The schematic shows heater (filament) power on pins 1 and 35. Gottlieb used 5VAC but I am using DC. The important thing is they do not glow.
To drive the segments you have to choose a digit. I chose D6 and applied 12VDC to pins 2 & 5 to select it. Then I applied 12VDC to pin h to light the center-vertical "1" segment. I was suspicious this segment was shorted and the test verified this. 2021-04-01 07.42.26 (resized).jpg

I then moved the segment selector to pin 9 to test segment e (lower left) and it worked as expected.2021-04-01 07.43.52 (resized).jpg

At 12VDC the segments were dim. This display was nice and bright so this looks normal. On dim displays that need recharging they might not be visible and an attempt to recharge should be done first.

Then I went to test the 6118. I made a quick tester that supplies 5VDC to the chip via pin 10 with ground on pin 9. I wired up leds with inline resistors. Applying 3.3VDC to pins 1-8 would apply send 5VDC out the corresponding pins 11-18 to ground through the LED.
2021-04-01 08.41.59 (resized).jpg
This worked very will. I am already looking at another design with momentary switches.

I am concerned about the extremely small load being put through the 6118 may not be a real test. But...it does validate the IC works as intended and open and short circuits should be immediately apparent even at low voltage.

Here is a shaky cam video of it in action:

Observation note: doesn't the driver circuit in the 6118 look just like a higher power version the solenoid circuit in Bally and Williams games? pasted_image (resized).png

The glass test can be done on the board without issue. I am getting my voltages from a meanwell RQ-50B

I was pretty sure it would but I wanted to verify it. Works on a DI513 as well