Quote:
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There's also a warning about not storing them on their backs. Grease migrates into the cavity and causes problems.
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A quick search found the above quote here:
https://vintage-radio.net/forum/show...05&postcount=9
Maybe it was sold as dead, as nothing lit up when they tried it, it could well have a secondary power supply fault, or problems with those aluminium rivets HP liked using as ground points (not sure if the 8640 uses them as I've not looked in mine for a long time), I did have a pulse gen that used them & many had corroded through.
David