I think I started watching it in 1978, it was the best heh. I do not know if it is available either.
I am surprised that another has watched that. I have yet to meet anyone around my age that has (38).
I recall seeing Starblazers on one of the then-”new” UHF television channels in the mid-’70s. They’d flip back and forth between that show and Speed Racer in the same time slot every three months or so.