[Heathkit] SB-10 Modification (was DX-100B on Phone - bad audio distortion / oscillation)

[Rick Poole]

Do any of you have a DX-100B that you're running with the SB-10 
sideband adapter?

This one has the SSB modification, and I have the SB-10 to go with 
it.  There is an additional mod whereby the AM/SSB switch was 
replaced with a 3-position switch, with the third position for spotting.

I'm wondering if the modification is part of my self-oscillation 
problem.  The mod involves running long lengths of wire the entire 
width and depth of the transmitter, terminating at some points that 
could be sensitive, and picking up who-knows-what along the way... 
certainly I can see these long wires picking up RF and feeding it to 
places it doesn't belong.

If any of you has a DX-100B with this modification I'd be interested 
in knowing how well it has worked out for you.

Meanwhile I'm considering backing out of the modification altogether 
and seeing where we go from there.  With five rice boxes of various 
vintage, a KWM-2A, and a Marauder, it's not like I don't have enough 
SSB equipment to get me by... don't really need another SSB 
transmitter.  And the old way of spotting with the DX-100... pressing 
the key with the Plate switch off... always seemed to work fine with 
my first DX-100 back in the early '60's (doesn't look like this one 
has the grid block keying mod so using the key for spotting should work fine).

More than one of you has advised backing out of all modifications and 
returning the rig to its original configuration, so that's what I 
think I'll likely do.  Still, would like to know if any of you have 
the DX-100B / SB-10 configuration and how you like it.

Rick WA1RKT