Thread: Test CRT Numbers ?
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  #4  
Old 09-22-2017, 06:14 PM
kvflyer kvflyer is offline
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Join Date: Nov 2006
Location: Fernandina Beach, FL
Posts: 1,058
Some information about the "test tubes".

https://www.antiqueradio.org/8XP4PictureTube.htm

https://www.antiqueradio.org/5AXP4PictureTube.htm

http://www.radiomuseum.org/tubes/tube_8yp4.html
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