[vol.2]

The Hor lock issues could be the Hor Frequency adjustment. You usually put a small white box up, and then short a transistor in the Hor circuit and adjust the freq pot until it stands still or as close as you can get to it. Usually in older TVs I've never been able to dial it in perfect, it always drifts a little (in the adjustment phase, it always works fine after reconnecting the circuit)

Edit: actually, I just read your manual and apparently you don't need to short anything, there is an adjustment for HSYNC, R505 which can be tweaked without any other procedure

Limiting the TV power with a bulb can have weird effects on voltages inside the set. I know I've seen issues with not having enough juice to start the Hor oscillator, which can throw off voltages in that circuit. It was a tube TV though, so I don't know if the same thing can happen in a solid state set as I've never tried it