[Heatercathodeshort]

I took this picture this morning of the line output transformer in the Ekco T377. It is the same chassis as the T368 but has a 19" tube. It shows the connections, the only difference being that the black wire on your drawing [bottom right] is a white wire on the T377.
Don't forget to check the 27K bias stabilizing resistor from the HT line to the cathode of the video amplifier. It often reduces in value giving some very odd effects. Hope this helps. Lovely receivers spoiled by the Mazda CME1703 CRT that lost it's sparkle after a couple of years. It lingered on never really getting any worse but the high quality picture never returned unless the tube was changed! Picture of T377 picture. John.