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Old 15th Apr 2019, 7:56 pm   #81
VT FUSE
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Join Date: Aug 2010
Location: Malvern, Worcestershire, UK.
Posts: 194
Default Re: Chinese 1A2 Super Regenerative FM radio kit

My working theory is that cardboard cases and wraps within boxes have a high acidity content and the makers never planned for storage stretching into decades.
Often a new old stock valve is unwrapped to reveal one or more typically corroded pins,the uk material being DUMET from memory and I suspect this green corrosion to be a type of Galvanic corrosion resulting from moist/damp storage conditions but I am not a metallurgist or an electrochemist so cannot be more precise.
The later Mullard Cradlepacks could allow the valve pins to contact the possibly damp cardboard top flap above causing said corrosion.

Mike
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