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Sylvania 5692 Black base tubes

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Manolo47

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Joined 2006
I have a pair of these tubes. They have the three micas and extra supports and are short tubes. The base is black with white Sylvania made in the usa lettering. So, how come these tube is not seen in the 5692 lore and mentioned in the internet enthusiast pages? I can publish a photo later on.
 
M

Manolo47

Member
Joined 2006
I am attaching a photo of the tube.
 

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