[R-390] Problem !?

[Pete Williams]

 G'morning...

Process of  aligning a R-390A...The 1st variable IF calls for 1.2 Mhz to
tune cores  and 7.6 Mhz to tune trimmers .
No matter what combination of core and trimmer settings I use. peaking 1.2
Mhz on  L232 always results in the core almost fully in  and out of  thread
..  Have struck this on RF section in past too but it always comes good 
Why is it  so ?
The Diode load voltage is also much higher at that frequency than at the
7.6Mhz end but that may be a function of the sig.gen input which is
connected to the balanced antenna input.
I maybe  suspect the 51 pf cap open below the  deck but haven't had the
strength of mind-yet- to take the deck out  for  look.
Cores have been changed with no improvement.
Suggestions  welcomed .
Cheers
Pete VK3IZ