[DaveWM]

the best way is to simply pull the crt socket back just enough to expose the pins, then using the rat shack spring loaded prob you clip on to one pin at a time (neg to chassis) and get a reading. you want the socket to be on enough to still work the CRT. As far as what pin is what, you should look up the CRT (google) and it will be listed along with pin out. stay away from the focus pin it will be the one that has space between it and the other pins on both sides.

dont try and just use the prob directly to the expose pin, it can be done but you risk slipping and shorting out on pin to another. far better to get it all hooked up and make sure nothing is shorted then power up, get a reading, power down and move to the next pin.

oh one last thing, if you do this a lot you use a socket adapter that goes between the CRT pins and the socket, it has test point that are clearly labeled that make checking pin voltage easy.