{Collins} Eimac 3-500Z tube value?



Gentlemen,
This may be slightly off topic, BUT could anyone give me a clue on the value for a pair of 3-500Z tubes NOS in Eimac factory boxes, one of which is still sealed with the company logo boxing tape?   Anyone know how long it has been since Eimac made these?    
Thanks,
Mike, AC5P    





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