OK, i think i found someone with a tube tester rather close by, I jst have not been able to get my hands on it yet.
Poking around the IF section, i did spot something a bit disturbing,
https://imgur.com/hVmgorU
why is the bottom part of that NPO cap uncovered? did they not see that when they built it? It cant have been good to have that bit of its innards exposed all these years. :/
Looking a bit closer at the schematic ( just guessing ) that cap is a critical part , since it was a 5% and was part of the adjacent sound reject, so if it degraded because of being exposed and de-tuned the circuit... perhaps it may do what I'm seeing, not being able to tune in anything...