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Pin numbering, viewed from bottom or top?
Pin numbering, viewed from bottom or top?
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Old 31st May 2009, 09:42 PM   #1
flysig is offline flysig  United States
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Default Pin numbering, viewed from bottom or top?

Are the pin numbers for tubes as looked at from the bottom or top?
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Old 31st May 2009, 09:46 PM   #2
leadbelly is offline leadbelly  Canada
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Pin numbering, viewed from bottom or top?
http://www.dogstar.dantimax.dk/tubestuf/pinout.htm
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Old 1st June 2009, 01:04 AM   #3
flysig is offline flysig  United States
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Thanks, Leadbelly. It would have been less than good to have assumed that the pinout was from the top, like the integrated circuits are!
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Old 1st June 2009, 12:21 PM   #4
Sal Brisindi is offline Sal Brisindi  United States
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Bottom, you count the pins clockwise.

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Old 1st June 2009, 09:22 PM   #5
richwalters is offline richwalters
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Location: Alps:Tube amp designs over 150W, SMPS guru.
Many IO types have numbers on the tags. Always read from underneath.
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