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By "plate cap", DaveWM didn't mean "plate capacitor", but the physical connection "cap" on the top of the 6CB5 horizontal output tube.
Pull the 6CB5 out of the set, and measure the DC voltage on the wire that was connected to the top of it. Should be +375V or so. DO NOT try to measure this with the tube installed, as the high voltage pulses normally present will fry your meter!
Put the tube back into the socket, reconnect the plate lead, and measure the voltage on the screen grid (Pins 1 and 8). Should be about +175V.
Check the voltage on the cathode (Pins 3 and 6). Should be about +7.5V.
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