[Hallicrafters] SX-117 Help

[Bill Smith]

I just acquired a SX-117,  which, after replacement of the trim capacitor on
the VFO,  seems to be working correctly... except for popping audio noises
in loud signals (AVC problem?), generally weak sensitivity on all bands, and
an S-meter that won't move above S-9 on any signal.  I've checked through
the AVC and everything seems to ok in that circuitry.

I am using the manual available online, and have found a number of
discrepancies between the schematic and what is in the receiver.  For
example, in the AVC line, R63 is listed as 1meg in the manual, but is
6.8megs in the receiver.  C107 is listed in the manual as 0.47 mfd, but is
0.22 in the receiver.

Looking further, it looks like the first converter, which appears to be
triode-connected in the receiver (a 470 ohm resistor is wired between plate
and screen of V2A) is shown in the schematic with the screen bypassed and
connected to the B+ through a screen dropping resistor.

I haven't checked the rest of the set, but it looks like factory revisions
were made to production runs.  Has anyone run down the changes made in the
circuitry, or have any experience with the problems describe above?  I note
the set has an aluminum chassis, but grounding seems ok from the few tests
made so far.

Thanks in advance!

73 de Bill, AB6MT
billsmith at ispwest.com