Unknown tube similar to px4

Cassiel · 16th March 2009, 06:17 PM

Do you know this tube?

rtsang · 17th March 2009, 04:00 AM

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

CHeck this Site devoted on PX4

pointy · 17th March 2009, 01:02 PM

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.)

Cassiel · 18th March 2009, 02:38 PM

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:
http://www3.osk.3web.ne.jp/~euvalve/gallery/px4.html

17th March 2009, 04:00 AM	#2
rtsang diyAudio Member Join Date: Aug 2005	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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17th March 2009, 01:02 PM	#3
pointy diyAudio Member Join Date: Mar 2009	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.)

18th March 2009, 02:38 PM	#4
Cassiel diyAudio Member Join Date: Sep 2004 Location: Madrid	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: http://www3.osk.3web.ne.jp/~euvalve/gallery/px4.html