On Tue, 15 Dec 2020 08:41:45 -0000, "Brian Gaff \(Sofa\)"
wrote:

I'm assuming there is no pot controlling the timebase speed that may be
somewhat knackered in its ability to connect to bits of itself, ie the noisy
volume control syndrome?


I also assume this is a semiconductor design, not valve. In that regard is
there a way it can be synchronised, would not be much of a scope without
such a feature, so maybe that part of the circuit is up the spout.

The idea of syncing a free-running scope T/B went out decades ago.
Modern scopes have "trigger level" control which determines the point
on the i/p waveform at which the sweep begins. This also enables
single-shot operation, although you would have needed a storage scope
or a camera to make much use of this feature before digital scopes
came along.
(BTDTGTTS)