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Old 15th Apr 2019, 7:56 pm   #81
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.

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