Re: HV regulation.
If you're intent on using a bipolar transistor as the series-pass element, consider something like a MJE340/MJE360 - they'll handle a couple of hundred volts with ease.
Alternatively, what about 'keeping it vintage' and using a couple of VR-tubes? 85A2 (85V) 0A2 (150 volts) and 0B2 (108 volts) are available cheaply.
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