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on checking the HO Tube current, some sets make it easy, some not so, but the easiest way to do it is to use one of those tube socket things that have two wires coming out that break the cathode for you. Every once in a while they will not work (like if the suppressor screen is grounded and the cathode pin is wired to it then the ground). Also be careful handing the top plate lead fo the HO tube. Its easy to break off the top plate cap from the tube, and also the wire itself is ofter brittle and will break easy. I hold the tube upside down and spray in a pot cleaner, let gravity pull it into the joint of the cap plate connector and the tube leave it be for about 30 min, and then it should come of with a little side to side rocking action.
I also will add a wire to replace the jumper that is often used in the cathode circuit, just a insulated wire with a spade connection with the other side of the connection bolted to the chassis in the back. this make it very easy to test the HO tube cathode current (esp useful with the socket thing did not work).
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