[Boatanchors] [BoatAnchors] Micamold Recovery- Aging Test

[john]

Thanks for sharing these results Dave. It makes perfect sense given the 
diagnosis that these devices are ruined by moisture ingress.  Sure looks 
like you've proven that hypothesis.

John k5mo



At 10:55 PM 7/28/2014, David Stinson via BoatAnchors wrote:
>Some have been following this test of the possibility of
>recovering NOS "leaky" Micamold caps to some level of service.
>
>Summary-
>20 NOS "leaky" Micamold caps were baked at a temperature
>above the boiling point of water (250-300 degs F) for 1.5 hours.
>They were allowed to cool for 2 hours.  There was some minor
>oil leakage from some caps.  Some had minor "steam bulges."
>19 of the caps now tested "good" on my ZM-11 bridge.
>The caps were coated in plain white candle wax and placed
>in a high-temp, very high humidity environment for 3 days.
>One failed due to a defective wax coat, the remaining 18
>testing "good."    The remaining caps were connected in parallel,
>the group then placed in series with 170 VAC PTP and a lamp
>for several days.  None failed.  The caps were then left to "age"
>in a hot Texas barn for a month and retested.  None failed.
>I have marked the 18 remaining caps with a daub of paint
>and added them to my inventory.
>
>I will now process a much larger batch, agitating the wax
>this time for better coverage, and test them.
>I'll let you know.
>
>73 DE Dave AB5S
>
>
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III 


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