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This unknown beam tetrode looks like a line output valve. The size suggests a more powerful device than the PL36.
Thanks to Bob Hopkins for sending the image.
The wide glass tube envelope is - mm in diameter, and excluding the IO base pins is - mm tall.
Reference: Observation.

 

Updated February 21, 2014.
shape:wide.glass.tube construction:glass.foot type:beam.tetrode base:io pins:8 pin:
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