Has anyone contacted this company?
I think it is the same as the one sold on ebay, but maybe we can ask this company ask for improvements. ;)
https://www.kariselectronic.com/msu1fus11_p34005.html
In my experience, many of the causes of SFTM board not booting are input buffer 74HCT541 failures.
This board seems to check the input status at startup, and it will not start if the input buffer is faulty.
In addition, since the JAMMA pin arrangement of this board is upside down, the input...
A68KZN696X have the same curvature as A68LBT696X.
By the way, have you confirmed that there is no problem with your MS-2931 chassis?
This is because a faulty chassis can break the tube.
PSA: MS293X, faulty chassis can break the tube
I think that combination has no problem.
My own Blast monitor is same as that combination.
However If the MS-2931 chassis came with A68KSM696X, exchange of heater register is needed.