Geeteoh is pronounced by saying the letters G T O.

My name is Jeff Klein. I design and sell circuit boards for early solid state Bally and Stern pinball machines. I am trying to fill the void for replacements not offered by others and cool custom enhancements. I create boards that I want to use in my pinball machines. If a design works well, I offer it for sale to others.

I do this as a hobby. I have a regular full time day job. I source most of my parts from US electronics suppliers and build up all the boards myself by hand. My sound boards include a printed and bound manual that contains very detailed information about the board as well as schematics and a parts list. My sound board designs have mostly through hole components with all ICs socketed. This makes for easy trouble shooting and repair if needed in the future. I test every board. I set them up for the intended machine and even set the volume mixing knobs. I design them to be easy to install with no setting changes. I want them to work in your machine upon first install and power up.

I have a YouTube channel where I show how my designs work. I also have some diagnostic videos as well as showing off some of my future designs.

https://www.youtube.com/@geeteoh1

I fully support my boards whether you originally purchased it from me or if you purchased a machine already containing my boards. Email me with any issues and I will get you going.

geeteoh@gmail.com



What's Going in the Shop? - Updated 12-30-25

1. I now have an Eight Ball Deluxe LE machine. Thanks Mike! I'm working on getting it playable so I can better support my sound boards. This is a popular game. I also want to want to show off my new female voice sound bank on an actual machine.
2. I'm on the lookout for a Bally Harlem Globetrotters machine. This will be my next custom sound board.
3. I'm reworking my Solenoid Plus Sound Board design for vintage Stern solenoid boards. I had my original design wrong.
4. I'm revisiting my Red-Green-Blue LED Bally KISS animated marquee design. I need to detect OFF better. I need to get the color of white more consistant.
5. I need to get my Bally KISS machine 100% playable. I have some switches and lamps out. The left flipper feeds back voltage into the other solenoids. I've almost re-pinned all the connectors - which has greatly improved the machine. I purchased this as a trashed out machine.