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I removed the second 1B3 and hooked a jumper to the output of the first, then I installed a 5AXP4 test CRT, turns out it works very well this way.
I still have no control over the brightness but the "Picture" (Contrast) control does work, possibly the Brightness Pot is bad.
The Sync is all over the place but I was able to get it to hold still long enough to snap the picture below.
Unfortunately as the set gets hot the picture fades out, also I noticed the image is negative, not sure if the 5AXP4 has it's Grid and Cathode wired differently than the 5TP4 or if it's a problem with the chassis.
I haven't tested any of the tubes in the i.f./Vertical sweep chassis but I did swap out most of the relevant ones with no improvement, there are probably some drifted resistors somewhere.
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