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Old 16th March 2009, 07:17 PM   #1
Cassiel is offline Cassiel  Libya
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Default Unknown tube similar to px4

Do you know this tube?
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Old 17th March 2009, 05:00 AM   #2
rtsang is offline rtsang  Hong Kong
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Default An early PX4 with anode fins?

Or similar British made audio output triode by other companies like Cossar?

CHeck this Site devoted on PX4
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Old 17th March 2009, 02:02 PM   #3
pointy is offline pointy  United Kingdom
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it looks like it had a canvas base cover once apon a time, and would have been military (but other than that it's gone A.W.L.)
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Old 18th March 2009, 03:38 PM   #4
Cassiel is offline Cassiel  Libya
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Ok, thanks for the help. I've found this info:

The valve in the photo has blackened fins spot-welded to a shiny anode. This shows that it is of post-1938 manufacture and has been uprated from 250 V and 12 Watt dissipation to 300 V and 15 Watt dissipation.

The tube is here:
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