Re: R209Mk.2 PSU
Investigating my junkpile, I've sourced the bits needed to do my initial 12V-regulator-and-back-to-back transformer-for-the-HT scheme, a bunch of boards salvaged last year from a client's scrapped 500-page-per-minute A3 colour-printer yielded a couple of suitable transformers and loads of LM340-12 regulators, good-quality electrolytics and sensible bridge-rectifiers.
I'm preferring to go this path because firstly it's zero-cost and secondly it avoids the issue of RFI from inverter-oscillators.
The R209 will work again!
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