help with ID'ing a tube

ke4mcl · 07:08 AM

i spent my day today sorting tube bins and ran across this tube. triple mica and looks like a 6sn7 but the structure is rounded off like some 6sl7's i have seen. i have never seen a triple mica 6sl7 though. could this be one of those ruggedized 6sn7's the headphone amp guys are avidly hunting down?

i already tried a magnifying lens and also tried the old timer trick of lightly exhaling on it to try to read something faint off the frosted glass. no dice.

HollowState · 02:24 AM

I'm going to say that what you have is either a 6BL7 or a 6BX7. Both look similar depending on exact vintage. I have both of these numbers packed away in the attic. Perhaps test it as first one and then the other and see which best matches the test.
Both are medium mu with the BX having a slightly lower Rp and amplification factor.

ke4mcl · 21st November 2011, 03:43 AM

will jot that down and try that out once i get ready to start testing. thanks!

v4lve lover · 21st November 2011, 02:19 PM

that is definetly a 6bx7 good show .

20th November 2011, 02:17 AM	#2
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	I'm going to say that what you have is either a 6BL7 or a 6BX7. Both look similar depending on exact vintage. I have both of these numbers packed away in the attic. Perhaps test it as first one and then the other and see which best matches the test. Both are medium mu with the BX having a slightly lower Rp and amplification factor. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University Last edited by HollowState; 20th November 2011 at 02:24 AM.

21st November 2011, 03:43 AM	#3
ke4mcl diyAudio Member Join Date: Apr 2009 Location: miami, fl	will jot that down and try that out once i get ready to start testing. thanks! __________________ certified packrat

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21st November 2011, 02:19 PM	#4
v4lve lover diyAudio Member Join Date: Aug 2010	that is definetly a 6bx7 good show .

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