I think they claimed to be running 35kw - but that was of course a fib. We used to listen on an old Pye valve radio, with a magic eye for tuning.
Happy days - my old (late) Mum, Loved 390 - it played her Deanna Durbin songs of course.
It says "It later became Radio 390, Britain's most powerful offshore pirate". Hmmmm, the Italian built RCA BTA10J was run at about 6kW, with low modulation, into a 150 foot mast, with top guy radials, that was possibly 50% efficient, at best.
I Found this interesting interview:
https://archive.org/details/PaulPetersMeetsBobGrahamOf60sPirateStationRadioInvictaRec.Spring2012
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