[Boatanchors] Any Experiance with Early Hally S-19R?

[David Stinson]

Is anyone here familiar with the early version of
the Hallicrafters S-19R? It's the one with the
6K7G 1st IF, 6Q7 1st Audio and type 41 Audio PA.
Here is the diagram:

https://photos.app.goo.gl/mAdhuBVZ69hZvZdr9

I'm trying to refurb this thing for an old friend,
but it's a bear.  Bands 1 and 2 are working well,
but on 3 and 4 the LO has only one cap to tune and
they simply cannot be made to track. The mixer
input tuned circuits don't seem capable of
tracking, either.  I've had to add capacitance at
both the LO and Mixer tuned circuits on band 3 to
get them even close.  Band 1 requires the padding
cap on the mixer coil to be disconnected and any
cap across it is "too much."  This is the case
whether the antenna input as a 50-ohm non-reactive
service monitor, through a 400-ohm series resistor
as the manual specifies or a random wire antenna.
Band 2 sounds good but Band 3 is not only
"untrackable," but has a problem with images.  The
IF and BFO are aligned properly.  Someone subbed a
37 tube in the BFO for the original 76, and that
does improve things.  I've also added a coupling
wire to improve the BFO injection and that did
work well.  Band 4 seems pretty hopeless; focusing
on 3 for now.  The design sure could have used an
antenna trimmer.  And it has a microphonic on
strong signals which seems to be connected to
mechanical resonances in the tuning cap because of
the metal freq dial "ringing" like a bell.

Anyone have some tips on this old Hally?

TNX OM ES 73 DE Dave AB5S