Thanks guys for your time and effort in trying to resolve this puzzle.
The overall picture here shows the complications I encountered with the two yellow tubular capacitors which were not in the Circuit Diagram: -
http://www.vintage-radio.net/forum/a...7&d=1483799563
See also my Post #49 here (and Lawrence's correction in #50): -
http://www.vintage-radio.net/forum/s...=132722&page=3
Will do some more detailed circuit tracing tonight.