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Well I went ahead with the experiment and results where not surprising. I installed the replacement HOT in a known working nt-2501 and the HOT instantly blew on power on. Just sat there chirping. But no damage to the chassis fortunately, I reinstalled the correct HOT and it still works. Oh well...

Ok so I was able to find a replacement HOT for the Sharp Image at the local electronics store (yes my town actually still has one!) The original was a D1879 and the replacement they say is an NTE2331. I also have a spare neotec nt-2501 chassis (not the one from the CA Speed cab) with a bad HOT...

Yep, mystery solved! The HOT is shorted across every leg (I didn't unsolder it, just tested in the board). So nothing wrong with the RCA tube, just installed an incompatible chassis, duh! 🙄 Well at least I know now and can focus on repairing the chassis' knowing the NeoTec won't fry itself once...

Blowing my HOT sounds like it would be a good thing 🤷 Ok so on cab#1 with the neotec/rca tube I have 0.6ohm on the yellow/green wires and cab#2 reads 1.0ohm on the yellow/green. Would that be enough to blow a transistor? The red/blues are much closer, 6.4ohm on cab#1 and 6.9ohm on cab#2 Edit...

Cab#1 with the NeoTec has an A63A26HCX heater voltage is 6.3v and I haven't been able to find a G1 voltage (are there any other critical specs I'm looking for? I have heard that "all" modern 25" monitors were 6.3v heater and 50v G1) Cab#2 with the Sharp Image chassis is a Zenith A63AGD10X with...

Oh thanks, no I'm not sure and didn't know that was an issue! I'll check on that.

Some additional info. All the chassis seem to somewhat energize. No clicks and no static coming from the crt or anything but I can measure voltage on the boards when powered up and they do make a quet high pitched hum when they power is connected, and no blown fuses. Also: Hillarious (and...

I have a pair of California Speed 25" sit down cabs. I pulled them out of storage and was getting them set up and linked and they were both working. They both make a loud "clank" when powered off (which is not uncommon for arcade cabs and I don't know if thatbis relavent) the last time I turned...