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Old 17th Sep 2019, 11:34 pm   #76
Argus25
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: Yet Another Bush TV22

Looking at your raster, just in the zone of the first box(drawn by the white lines) on the left side about 10% into the line scan, it looks as though the linearity is crowded a little and the beam brightness increases there. I think there is an issue with the energy recovery by the damper, possibly the valve has low emission or the boost capacitor high ESR. Also it would be worth replacing that 2uF electro with another capacitor too if not done yet.

I don't have a standard scope recording yet of the H drive at the grid of the PL38, especially to check for example if the point at which the PL38 gets driven into grid current (and the drive wave is clipped) matches yours.

When I am able I am going to collect all the waveform data from this stage using my wide bandwidth 50kV capable probe, so as to document exactly what each waveform looks like on every circuit point, but I have not got around to it yet.
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