S-40B Question

[Alan W. Fremmer]

Fellow Collectors/Restorers,
 
Recently acquired a Hallicrafters S-40B receiver on eBay.  This model  was 
the first shortwave radio I got as a gift from my father when I was 14 or 15  
years old.  Of course, haven't a clue as to what became of the original and  
regret losing track of it. This radio works quite well and I'm pleased with it  
overall.  
 
My first question has to do with whether there were variants of this  
particular model.  Most I've seen have the normal dial and switch settings  
highlighted in red.  Mine has a white dot over the normal settings.   The radio does 
not appear to be modified in any way.  Manufacture date is  August 20, 1953. 
 
The second question has to do with tubes that were replaced by the previous  
owner.  There are several glass envelope tubes present as opposed to the  
usual metal envelope types.  Would this have any adverse affect on  performance?
 
Thanks in advance for any responses to my query.
 
73, Alan - KB2HEI



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