You guys had Space:1999 too? Sweet, although i'm a much later generation [1998 was such a good year for Tomy's bank balance in Plarail sales, since such a loyal customer was born then
], I grew up with loads of the Gerry Anderson shows, like Stingray and probably most notably Thunderbirds - Thunderbirds was, and still is probably one of my favourite TV shows ever, I grew up watching old VHS tapes that my dad had collected for me [he remembers Thunderbirds & Stingray when they originally aired in the 60's] so it was kind of passed along the generations lol
Always interesting to find out other places that the Gerry Anderson shows reached though, until I got into anime and Japanese culture I had no idea that the Gerry Anderson shows, Thunderbirds in particular are actually rather popular in Japan, which initially surprised me, until I watched a number of anime that pretty clearly took inspiration from the Gerry Anderson canon, notably Neon Genesis Evangelion which [for those in the know] references a huge number of Gerry Anderson shows as the director was a fan of his work; I think there were some Space:1999 references in that too, so yeah
But yeah, always fascinating to hear the miriyad of places these shows reached, I always thought they were very much a British thing that never really left the UK, but honestly, it never ceases to amaze me how far they went on export
Interestingly, I got into Space:1999 much later, mainly when I 'rediscovered' the Gerry Anderson canon in my teens by re-watching Thunderbirds/Stingray/anime, and yeah, I really enjoy it, admittedly you could argue that it's aged a bit, but I think it still holds up even now, like most of the Anderson shows
As for the 'PCL 15 lamps', those sound like vacuum tubes to me - Older electronics, including TVs and radios relied on them in a time before transistors were common and affordable, although in fairness I think here in the UK most new electronics by the mid 1970's had switched to transistors or other methods of operation, as I collect old electronics, and what I have, dating back to about the mid 1970's has all-transistor construction, whereas some of my relatives recall 'valves' or 'tubes' as they were known for short being commonly used through to the end of the 1960's at least, so if I were to guess, what you had was probably one of the last generations of television to use vacuum tubes as opposed to transistors
Of course, you'd be forgiven for thinking these tubes were lightbulbs, as they do look oddly similar in shape, and the fact that both items are contained in a glass 'bulb' - You wouldn't get much light out of one of these though lol