[GreenKeys] different HAL ST-6;s?

[Don and Diana Cunningham]

Eugene,
I see two, and maybe three differences in the one you got and the one 
currently for sale.  The last one for sale has the 425 hz shift board and 
has the Molex plugs like the ST-6000 does.  I think it is a "later" version 
of it.  Most importantly, the board to the far left (facing the front of the 
unit) is the AK-1 AFSK generator in your unit.  I don't see the toroids on 
that board in the unit for sale, which MIGHT make it the XTK-100, crystal 
controlled AFSK unit!!  If that is the case, it would be a nice addition to 
your shack.  I think I have one each of those versions here, and a "new" 
XTK-100 unit that I want to get on the air one day.  Always was partial to 
it, and have a new ST-6000, so probably crazy, hi hi.  You will enjoy your 
unit.  By the way, I suspect the AC jack is on the late unit too, just not 
visible in the guys pictures.
73,
Don, WB5HAK