S-40B Question

[Bob Krassa]

The question about glass versus metal tubes - my understanding - and I have 
not measured this scientifically but seems to me just from working with 
hem  - is that the metal tubes are better for a number of reasons - the 
metal envelope provides RF shielding so you don't get unintended mixing, 
birdies and the like; also the metal radiates heat better so they run 
cooler.  I think they last longer.  The only problem is you can't see the 
orange glow from the filament!

Bob Krassa KC0TDS

----- Original Message ----- 
From: "Alan W. Fremmer" <AWFremmer at AOL.COM>
To: <BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Friday, May 18, 2007 7:56 AM
Subject: S-40B Question


> 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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