[Hallicrafters] SX-28 IF alignment (sweeps)

[Julian Bunn]

Some of you may remember I was having a problem with the S-meter on my 
SX-28,
and the suggestion here was to check all the resistors in the AVC/ANL 
and associated
circuitry. So I went through and replaced all the resistors (some were 
indeed way off).

The S-meter problem almost went away, but not quite.

So I decided I would have to realign the IF, since component values had 
changed,
and maybe that would cure everything. I'm aligning with sweeps, and 
notice something
I don't understand:

The crystal sharp, medium and broad all peak nicely to the same 
frequency. The broad
and medium IF peak at a different frequency, about 10kHz lower. But the 
sharp IF peaks
at about the crystal frequency i.e. about 10kHz higher than the medium 
and broad!

How can this be? Surely the broad, medium and sharp IF share the same tuned
circuit? Any suggestions on what may be going on?

Thanks!
Julian