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Hey Guys,
I have been putting together some 6100 vector clones and ran into an issue with neck boards. I had 3 factory 6100 boards and 2 new Vector labs neck boards. All had CR23 sockets on them. The Vector Labs boards have some jumpers on them that I couldn't find info on but they made no difference. I have more info on those at the bottom of the post.
I was testing with a known good HV cage.
The issue is that the CRT is overdriven blue and the screen control on the flyback has no effect. The weird part is that I had one monitor that worked just fine but two others didn't. After spending days suffering with this I just boxed up all of the boards and sent them to @andrewb along with a deflection board and HV cage. I needed a sanity check and wanted to start with a complete set of known boards.
Andrew doesn't have a CR23 test set so he put a CR24 socket on the neck boards and they tested fine.
He then pointed me to a @bakerhillpins post about this very issue where pins 4&12 are not to be connected when using the CR23. Link here. 90 degree tube swap This is the issue and lifting pins 4&12 fixed the problem. I hope this helps others doing this swap.

The only reason the one monitor I had that worked is due to dumb luck. That tube didn't have pin 12 and with the factory neck board it worked. It would not work with the Vector lab boards though. To make those work I had to lift pin 4 as well.

I want to give a special shout out to @andrewb for his help on this and his beautiful rebuild work on the other boards.

This is what the screen looked like with 4&12 connected, it is supposed to be a white crosshatch. This is with the flyback screen control set all the way down.

20250117_160744 [Desktop Resolution].jpg

This is with 4&12 lifted with no other changes. I did have to adjust the screen control back up to normal position.

20250117_160413 [Desktop Resolution].jpg


When I looked up the tube in atomized this is the pin description that clearly states do not connect pins 4&12 (internal connection). I really wish I had RTFM before I started this effort. Since the first one I made worked by accident, I just assumed it was the neck boards.

Screenshot 2025-01-27 083401.jpg


Here is what I found on the Vector Labs jumpers. They appear to allow the use of a brightness pot on the neck board or to bypass it.

20250126_153529 [Desktop Resolution].jpg
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