Re: Dynamco D7100 restoration
If it still behaves like your video on that 50Hz waveform then either the stability control is set too high or the trigger circuit is over sensitive.
I don't have any manual for that scope but on a Solartron 1400 (1443 timebase) the setup was something like:
With no signal set stabilty control to just not run.
With 1kHz signal adjusted to 5 cm height the trig level pot should allow setting at any height along the sine (both positive and negative depending on polarity switch). Any instability can be corrected by adjustment of the internal trigger sensitivity preset.
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George
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