Tube Swap Question

Fudd

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So i picked up a old zenith system 3 monitor off of craigslist for $10...its a A48ACB02x zenith tube...my current tube with burn is a goldstar A48Kmx02xx....both use the CR-23 Adapter what do i need to check out next for compatibility? Tube swapping is all new to me, this would be my first.
 
Well I would check the ohms on the yoke to see if they are a match, or close. Otherwise you will be doing a yoke swap as well.
 
Check the back side of both tubes for some raised numbers in the glass. It'll say either 90 or 100. The both need to match for the swap to work right...
 
Searched all over the both tubes and didnt find any raised numbers for the deflection angle. Going to check out the resistance on both tubes. I know its red and blue and then the other 2 wires but where exactly do i check it at? I see where each wire comes into the yoke, is that where i can get a good meter reading?
 
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