[Hallicrafters] Lettering on DD-1

[Waldo Magnuson]

Are there any Hallicrafters DD-1 owners that could maybe help me?  I 
finally got my DD-1 operating and it works superbly.  I have a couple 
of questions though:

1) The inscribed lettering "SKYRIDER DIVERSITY  MODEL SS-1" has lost 
the paint inlaying the lettering.  In Duchis it looks like the 
lettering could be black.- could someone confirm that.
2)  I do have some hum in the receiver (all power supply capacitors 
have been replaced).  It could be a filament-to-cathode leakage in one 
of the tubes but my question is:  The push-pull output is a pair of 2A3 
tubes in which the cathode is the filament BUT one of the 2A3 has a 
bluish glow - I suspect this indicates some gas within the tube - could 
this be the cause of the hum?

Thanks.
73,  Skip  W7WGM