Thread: HV regulation.
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Old 29th Oct 2019, 9:35 am   #32
Diabolical Artificer
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Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
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Default Re: HV regulation.

Time to put this one to bed... After more experimentation I've found getting the dropper resistor that limits VR150 current right takes some doing, but have started to get the hang of it. There's a sweet spot to ensure proper regulation and supplying enough current to the circuit powered or load. Another aspect is supplying enough current to the VR valves so that they glow a nice deep blue, but this obviously effects the final regulated voltage, raising it.

In the end I'm not too bothered about the final regulated voltage in this application ( 10-20v either way makes no real difference to the final gain of the preamp) , the VR valves are really only there to clamp the HT whilst the heaters warm, so that Vmax of the smoothing caps isn't exceeded, and the blue glow is a bonus.

Andy.
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