Re: Telequipment D75 scope.
I wonder if you are expecting too much.
My experience is that 'scope amplifiers drift all over the place when cold but the drift slows down as they get towards thermal equilibrium - but they never actually stop drifting! For example, my Tektronix 7A22 amplifier (very high gain) can easily drift the trace right off the screen from cold! Even after an hour I will be constantly switching between ground and measurement to null out the drift.
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