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The signs are good.
Keep the brightness set very low until the white line is corrected. That indicates vertical problems. Usually nothing serious. Try adjusting the vertical lin and height controls first. To find them, remove the front plastic knob cover assembley. You will note that the control shafts are hollow and the knobs have small holes in the center. The height control is down the center of the vertical hold control and the lin is down the center of the brightness control. You will need a very thin screwdriver.
There are two tubes in the vertical; a 12AU7 on the PC panel behind the controls and a 6CM6 on the chassis. There are two 12AU7s on the PC panel. Vertical is the lower one.
Tighten the hex screws that hold the circuit board in place.
The X-155 is no big deal. 6BS8, 6BZ8, 6BZ7 will all work fine. There is a 1,000 ohm 1/2 watt resistor in the tuner that has a high failure rate. If you have snowy pictures after everything else is working, and you have replaced the RF amp, look for the 1K. It is likely burned. Also make sure the range switch is in the center position. That's the little flag switch at the bottom of the control cluster.
You're well on the way.
Don
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