[Hallicrafters] SX-28A parts nomenclature

[Waldo Magnuson]

    I'm refurbishing a SX-28A and have a couple of questions.
1) Is there a way of establishing if it is a 28 or a 28A by serial 
number?  My understanding is that the 28A has the fuse on the back 
which mine has (but could have been added).  My s/n is 163132 - is 
there a "registry" of s/n for different models?
2) Someone in the past has "butchered" the power supply section 
(twisted wires, friction tape, plastic sacks around components, sloppy 
soldering, etc.) which I am cleaning up as well as replacing 
capacitors.  The question is:  The parts listing states "Capacitor, 
fixed, one unit of dual unit, 40 mfd., 25 v d-c, electrolytic".  Does 
this mean two 20 mfd. caps tied together (as in a can) which is the 
case in my receiver, or something else?
    The good news is my SX-28(A?) is otherwise quite clean with no rust 
and a good front panel.  Doug Moore, KB9TMY -> K6HWY kindly provided me 
with the two phenolic antenna and speaker terminals.  Thanks Doug.  And 
thank you to the others who responded to my questions.  A great group.
73,  Skip Magnuson  W7WGM