No, it was a 7070, "IBM seven oh seventy",
and it used hundreds if not
thousands of 12au7s or 12ax7s don't remember which it was. And it was
definitely NOT solid state.
I do not know if IBM made a 707, but I would bet that would be it.
The 7070s were made from solid state modules, probably using the SMS
packaging system.
Maybe IBM used some numbers over? But I am absolutely
sure of the number
because we called it by that name when referring to it.
Very rarely, and when it is done, the two instances are completely
different, like a modern RAID box and a paper tape reader.
--
Will