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The best guide is the horizontal setup procedure in your Sam's photofact (the CTC 16 is on the ETF for free under color sets -> technical info). But a basic summary is to set up the Osc for optimal performance, disconnect the cathode* of the H output tube and insert an analog DC ammeter that can handle at least 250mA (more than 500mA full scale may not give optimal sensitivity), and adjust the H efficiency/lin coil for minimum current. (Should be under 210mA and preferably in the 170-190mA range, if over 210mA after minimizing something is wrong). Then there are further steps to adjust the HV reg focus and such.
Something I recommend is to add an above chassis 250mA slow blow cathode fuse...It is cheap protection and if you ever need to check cathode current instead of pulling the chassis and soldering all you have to do is yank a fuse and clip your meter on.
*In a pinch you can get away with the plate but the leads will have dangerous voltages and currents on them in that config.
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