[Hallicrafters] Tropicallized or MFP

[Howard Weeks]

In the the wet, humid, jungle environment of the Pacific theater 
during WWII, fungus and corrosion could destroy a piece of electronic 
apparatus before it could be placed into service.  Those coatings 
were intended to minimize or eliminate that problem.  

Another factor that contributed to this same problem was the issue of 
how to protect and or seal a part or assembly from the environment 
while it was in storage and or transit.  That is why you see parts 
from WWII sealed in packages that are still airtight after all these 
years.  

Howard K5JCP

On 15 Jul 2009 at 13:56, rbethman wrote:

> Unless BC-610s were ship mounted, (None that I EVER heard of.), your 
> interpretation would seem to be correct Rod.
> 
> All BC-610s and their associated components are ALL stamped MFP.  Then 
> again, so were ALL R-390As.  I do NOT believe "maritime" had anything to 
> do with it!
> 
> Bob - N0DGN
> 
> Rod Hogg wrote:
> > OK....Thanks.  Always heard to be "Moisture- Fungus- Preventative"
> > Musta heard wrong.
> >
> > Rod
> > KØEQH
> > <snip>
> >   
> 
> > MFP - Maritime Film Protected sometimes referred to as Maritime Fungus
> > Protection was a process to protect equipment from the high humidity of ship
> > board use. There is a Navy standard that the process must meet to be
> > certified . Tropicallized was a process that combined the MFP and high
> > ambient temp environmental considerations. Tropicallized equipment usually
> > did not meet any specification and was generally done to meet the
> > manufactures' or customers requirements.
> >
> >
> >   
> 
> -- 
> +------------------------------------------------------------------+
> |             AM Amateur Radio Operator    NØDGN                   |   
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> | Bob Bethman                \\\|///     " The absence of a danger |
> |                           \\ ~ ~ //      signal does *NOT* mean  |
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Howard Weeks
Harlem, GA 
K5JCP