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That's interesting. It could be that touching it brought the frequency more in line with what it should be. The flyback circuit performance is frequency dependent so if it is far enough off the generated voltages will be low. This includes the boost which is used to power up the horizontal oscillator. So maybe touching the grid caused the frequency change that increased the boost that got the oscillator running better. This may indicate the oscillator tube or other part that changes with voltage.
BTW, I've got a schematic for the 1076 and a voltage chart for the 1077B that both show the CRT anode voltage to be 11.5 KV.
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