[Electronic M]

B+ can safely vary by 30 percent in most tube TVs.

Your h out grid being positive instead of negative is very bad, and usually means your oscillator is dead or not feeding the grid. If the h out screen is high it usually means the plate is drawing far too much current.... this makes sense since if your grid is not negative enough plate current will be high(and positive grid will red plate the hot).

What I'd do in your shoes is disconnect the plate and screen of the h output and work on the osc until the output grid goes negative. The grid gets negative by rectifying the drive signal from the osc...if you unplug the grid or cathode of the output a negative voltage will not develop at the grid.