[R-390] Clavier IF Module - Ugh !

[JamesMiller]

Wow!  Working on a EAC 390a that has a Clavier IF module, ... unbelievable.
Couldn't get the IF module to behave, occasionally it would slowly loose
gain then it would come back again.  Plus some strange intermittants.  I
discovered that one of the IF amplifier tubes would loose filament (making
the gain go away slowly) then it would come back.  Found that the ground
lead to the filament pin had not even been soldered at the factory!  Wire
was looped through the socket pin, but not soldered!  That explained the
intermittent filament.  Soldered it and that particular problem went away,
but now another intermittent around another tube.  Again, another pin not
soldered, and three loose screws holding ground lugs.  While I was in it, I
did a complete check of all joints, and  found 3 more suspect/cold solder
joints as well.  Well finally, the IF module works fine now, but Clavier
must have had miserable quality control!  Didn't they also make electric
organs?