resistance between t4 and t5 is still 22k ohms so dont think its shorted out and all soldering around that area looks neat....
OK, here's my reasoning - maybe it can help you find the problem, by figuring out which assumptions are wrong?
Since the amp worked before, it must have been wired correctly. If the amp is wired correctly, then a glowing LED at A8 indicates the second triode (A6 plate, A7 grid, A8 cathode) is conducting reasonable current (nominally 4mA or so). If there is reasonable current, it can only flow to the plate (A6) through the resistor T4 to T5. If there is reasonable current through that resistor, and it has a 22K resistance, then there will be a voltage drop across that resistor, and the voltage at A6 will be closer to 90 than 150v.
A6 is also connected to the output grid at B1, so the output cathode at B3 will be at least as high a voltage as the grid B1. You measured both at around 150v.