Motorola ts907 low hv

[Yamamaya42]

I really don't understand what you are trying to say, there is no “setting” of the -45v on the grid of the HOT, and that is not an absolute value by any means, it is a general voltage in DC, that means the horizontal oscillator is running.

There is no current measurement there.
DC voltage only.

The ONLY current measurement is cathode current, and this is done through a coupling cap AND a current meter for both tubes independently, but only when the set is up and stable.

The meter you have does NOT have the range to do the cathode current test, so don't try.
I'm not sure what you were attempting, but nothing but dc voltage measurements should be done on the grid of the HOT.