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Selling one of my spare Defender CPU boards and one ROM board. Both boards are tested and working as of 19Nov2025. CPU board: Dynamic RAM upgraded to the more reliable 41256 (5V) RAM. Also the board has been modified to only accept 5V RAM. High score RAM replaced with non-volatile RAM (no...

Metal PCB mounting plate from a Williams Defender. Includes standoffs, volume pot, and brackets for sound board as shown in image. $60 shipped.

Anyone know the story behind the jumper (or lack of) on pin 7 of IC 3A (7486 quad logic XOR gate) on Defender CPU boards? The trace to the left of the IC is floating without the jumper, meaning the IC has no ground connection, so the jumper is definitely needed. However I don't see it on the PCB...

I just acquired another Defender CPU board that I plan on using as backup. The initial issue with the board was some or all of the video RAM ICs were bad. No surprise as they were the old 4116's. Replaced them all with 4164's and modded the board so that it only accepts 4164's in the future. The...

Tube tested and working with a K7000. Has a couple very light scratches on front. Cannot see or notice them when in a game. NO screen burn. Mfg: Orion PN: A48JLL90X Yoke: RED-BLU: 4.2 ohms GRN-YEL: 15.3 ohms Has 22.5mm "skinny" neck

Specifically, THIS piece:

I just married a rebuilt K7000 with a rebuilt P448 neck board and am seeing thick raster lines as shown in the pic. Adjusting the flyback makes no difference in the lines. Any troubleshooting suggestions would be appreciated.

I picked up a P448 neck board for a K7000 and it has a 22MEG resistor on the back of it. It is across +123V and SCREEN. Anyone ever seen this done before and know why?

$30 shipped.

Looking for a K7000 P448 neck board. Can be completely blank or populated. Doesn't matter if it works or not. PCB must be in good shape. Thanks!

So I finally got my TPG from CraftyMech (thanks!!) and tried it out on a K7000 that is in a Defender. The Defender game screens look good but the TPG is showing some issues: Blue shift: Top row has keystone issue? Blue line, lower left: Any ideas where to start?

Looking for control panel brackets for Defender. I have the clamps, just need the brackets that mount onto the control panel.

As the title says. Have the board and tube, need a frame.

If anyone needs a new electronics bench, I just picked up one of these Kewaunee benches off Craigslist: http://chicago.craigslist.org/chc/fuo/4504026750.html http://chicago.craigslist.org/chc/fuo/4504014703.html The guy lives in a western suburb of Chicago and has 6 of them left. They are...

Ran across this on Reddit: http://i.imgur.com/LQKgRgs.jpg Title is "Arcade Fire". Anyone know the story behind it?

Anyone know where I can buy a K7000 VR8 pot? Checked Bob Roberts and other arcade parts sites with no luck.

So did my first ever tube swap and thanks to KLOV nothing blew up :) Chassis is a K7000. Did a tube swap, cap replacement, flyback replacement, and header replacement. Only issue is there is some "garbage" on the right side of the screen, and it is there all the time regardless of what test...

Selling a Bob Roberts G07 Deluxe Kit for $20 shipped. Kit is new, never used. All parts are still inside. Contains cap kit, flyback, voltage regulator, HOT, width coil, fuses.

As the title says. Have a working A51JCC21X that came out of a TV. No burn. Pickup only. I live in southeast Michigan.

I'm about to swap out the tube on my Defender and noticed the degauss wire on the old crt is spliced into two sections, as shown here: The degauss wire on the new tube is one continuous band all the way around. Should I keep the degauss wire setup with each respective tube, or does it matter?