I am unable to test these. The 8505A looks to be in great condition. There is a white spot and what looks like a crack on the 8624 tube. It doesn't feel like a crack to the touch so im not sure about it but you probably know more. Highlighted in photos. I do not know much more about them but if there is some thing you think i can help you with please feel free to message me.

Please view all photos close and use the zoom feature for a close up view. These are the items you will get.

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Location O20