[Hallicrafters] SX 101 Mk III low sensitivity

[William Campbell]

Been working on a nice SX 101 with some problems.  160 thru 40 meters 
sensitivity is excellent.  20 meters thru ten meters sensitivity is low to very 
low on 10 meters.  I have checked all tubes (Hickok tube tester) and replaced 
all tubes not to spec.  No difference.

Replaced all paper caps, some were in obviously poor condition, no change.

Cleaned all switch contacts with Dioxit and q-tips.  Cleaned all tube sockets 
w/Dioxit with a small tapered fine wire scrubber. No difference.

Rx is stable, audio is clean and clear on am/ssb/cw,  in all modes.  No 
differnece.

Checked voltages at all points specified in manual,  all within specs.

I really want this rig working as it should but with limited tech knowledge I am 
stumped.

Any ideas will be appreciated.

Bill - WD4HEN