[Milsurplus] Water, Water Everywhere.

[Bob Camp]

Hi

> On Dec 11, 2015, at 8:00 PM, John Hutchins <jphutch60bj at gmail.com> wrote:
> 
> 
> As seen on Amazon :
> Eva-Dry E-333 Renewable Wireless Mini Dehumidifier  19.95

I’ve tried them both in the bucket version and the plug in the wall version. Neither 
did anything noticeable. 

Bob

> 
> DampRid FG83LV Hanging Moisture Absorber Lavender Vanilla, 3-Pack these are also wireless but not renewable }
> Hutch
> 
> On 12/11/2015 4:48 PM, Bill Carns wrote:
>> What you are talking about is getting the moisture to diffuse back out of
>> whatever material it has gone into that you are unhappy about. The results
>> will depend directly on the differential (in this case) humidity between the
>> internalized environment and the external (air) environment. The diffusion
>> is, as you have suggested also a function of temperature as is almost any
>> diffusion rate.
>> 
>> So.....you need to do two things to have any significant impact.  I suggest
>> building a "Dry box" by making some kind of moisture impervious container
>> and then putting a small dehumidifier in there. Then, as you suggested, also
>> heat it moderately so as not to damage the rig, components or the box.
>> There is a real nifty and cheap device that is sold at coops where they
>> handle poultry supplies. It is just a plug in outlet that has a thermostat
>> on it. They are not very expensive.  The real cheap ones are fixed temp and
>> set to maintain just above freezing. The adjustable ones can be set to go to
>> a higher temp.  OR, you can just make your own.  Bottom line is you need
>> controlled heat and low humidity.
>> 
>> Re the temp, Most components can handle 50 deg C.  This equates to just over
>> 120 deg F.   Watch out for plastics.
>> 
>> Whether it will work depends on how much damage has been done in the form of
>> corrosion and modifying the molecular structure of the material.
>> 
>> Good luck and I also have rigs long stored and grimace when you bring this
>> up. One of them is a real nice TCS set.
>> 
>> Bill
>> N7OTQ
>> 
>> -----Original Message-----
>> From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
>> David Stinson
>> Sent: Friday, December 11, 2015 10:43 AM
>> To: milsurplus at mailman.qth.net; boatanchors at mailman.qth.net
>> Subject: [Milsurplus] Water, Water Everywhere.
>> 
>> Many of our beloved old radios have been sitting, cold and quiet for many
>> decades.
>> Some of them getting close to a century.
>> Recently, I've been dealing with bakelite and phenolic in our sets which
>> have taken-up moisture over the years.  Right now on the bench I have a TCS
>> receiver in which one of the pins of Z202, an IF transformer, is leaking B+
>> to ground through the phenolic.  Pulling an IF from a TCS is a pain but
>> do-able.
>> So may we discuss ways to gently drive moisture from our sets?  I can "get
>> rough" in the stove with those bakelite inserts in WWII radio connectors but
>> that won't do for a whole set.  I've tried powering just the filaments and
>> leaving a set for a couple of days but I don't think they get hot enough to
>> do much good.  Heat lamps can do some damage.
>>  What have you done?    I'm thinking of light bulbs
>> with the radio in a thick cardboard box, *outside* in case the box decides
>> to catch fire or something.
>> 
>> 73 Dave AB5S
>> 
>> 
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> 
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