[Heath] SG-8, Sig Gen, Band "E" Fudgy

[digital-conjurers at roadrunner.com]

Got this thing out of 5-year storage, cleaned it up, lubed/cleaned the 
switches, pots, tested the tubes, etc etc.....and it all works fairly well 
for what is it...but Band "E" is extremely erratic.  A thru D are fine.

Have tried numerous fixes, tightened ground bolts, touched up fudgy 
soldering  jobs....no go.  Can sometimes get a squawk out of it around 40 
Mhz or so _ if I happen to bend the coil sub-chassis a bit towards the 
front panel....but it's very unreliable, not a permie fix.

Switched tubes, too...no luck.

Clue: The fellow who had this before me put in a 1Meg ohm pot in the audio 
gain with no on/off switch...can hardly see how this could affect the case, 
but...that band "E" is nasty...all it used is the bus bars for inductance, 
methinks.

Anyone have a similar issue and fix it with this item?

Tubes tested on a Hickok 539B.

Tnx,

Lin/KJ6EF