[Hallicrafters] Question: Tropicalized Halli receivers?

[Tom NØJMY]

Well, as I look into it a little deeper it gets more interesting.

I see that many of the air-core transformers and inductors are 
tropicalized.

Also, there's a couple of tube sockets that are high dielectric.

The speaker cone is tropicalized (surely they wouldn't just spray 
Glyptol or Cosmoline on a speaker cone, would they?), as is the voice 
coil and output trans.

The power transformer is also different, being a multi-voltage input 
unit - and it's tropicalized.

Oddly enough, none of the resistors change, but about a dozen of the 
paper and mica caps do, mostly with closer tolerance ratings, I gather.

So anyway - Duane, according to America's Underwater Ace-of-Aces of 
WWII, Rear Adm. Richard H. O'Kane, his U.S.S. Tang's wardroom and crews 
mess were equipped with "the finest Hallicrafters".  They would have had 
to have been a model that would pass shipboard radiataion requirements, 
though.

On some hard drive I've got a copy of an official Navy document that 
lists what receivers were or were not allowed on board WWII Navy ships. 
  Mark, W1EOF sent it to me.

73,
Tom



Duane Fischer, W8DBF wrote:
> Hallicrafters did build at least one morale receiver intended to be used in 
> both Europe and the south Pacific. It was adapted for the warmer and wetter 
> climates.
> 
> ----- Original Message ----- 
> From: "Charlie" <pincon at erols.com>
> To: <hallicrafters at mailman.qth.net>
> Sent: Monday, July 13, 2009 11:30 PM
> Subject: Re: [Hallicrafters] Question: Tropicalized Halli receivers?
> 
> 
> Since the "tropicalization" wouldn't be necessary on equipment used in
> temperate climates, maybe the components were changed to compensate for the
> higher expected environmental temperatures.  (???)
> 
> 73' Charlie k3ICH
> 
> 
> 
> ----- Original Message ----- 
> From: "Tom NØJMY" <n0jmy at hayseedhamfest.com>
> To: "List Hallicrafters" <hallicrafters at mailman.qth.net>
> Cc: "Guido" <laffitte at prtc.net>; <daileyservices at qwest.net>
> Sent: Monday, July 13, 2009 10:38 PM
> Subject: Re: [Hallicrafters] Question: Tropicalized Halli receivers?
> 
> 
> Okay.  I understand that.  But why would they change the values of a few
> dozen discrete components?
> 
> 73,
> Tom
> 
> Guido wrote:
>> Tropicalized usually meant that the radios received a special treatment in
>> order to resist high humidity environments. A lot of radios that served in
>> the Pacific theater of WWII had to be tropicalized. I am sure that many
>> S20Rs saw service in that area. Sometimes the radios were sprayed with a
>> special amber looking lacquer and they were sprayed almost everywhere. If
>> you see one you will never forget it.
>>
>> Best 73s
>> Guido KP4FAR
>>
>> -----Original Message-----
>> From: hallicrafters-bounces at mailman.qth.net
>> [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Tom NØJMY
>> Sent: Sunday, July 12, 2009 10:07 PM
>> To: List Hallicrafters
>> Subject: [Hallicrafters] Question: Tropicalized Halli receivers?
>>
>> Are any of you familiar with "tropicalized" Halli receivers?
>>
>> This evening I was going through the parts list for the S-20R and found
>> there was a couple pages of substitute parts to be used in "tropicalized"
>> units.  Of particular interest to me was a dozen or so paper caps of
>> different values.
>>
>> My curiosity gets the better of me.  What is a "tropicalized" S-20R?
>> Were they common at all?  Is there any quick way to identify one, short of
>> opening it up and checking the components?
>>
>> T
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