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Old 18th November 2009, 10:37 PM   #1
sphinx is offline sphinx  Canada
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Thumbs up physically small twin triode tube

I'm looking for a physically small twin triode tube to fit into a very tight space. It needs to be cheap and readily available. Any suggestions?
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Old 18th November 2009, 11:02 PM   #2
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google is your friend...

100 NOS RAYTHEON JAN 6418 Subminiature Twin Triode Tube - San Antonio - Bonanzle
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Old 19th November 2009, 01:35 AM   #3
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6021 is a small dual triode. I have been experimenting with them in a guitar preamp circuit. It will eventually go inside the guitar. They can be stuffed into an 8 pin round IC socket with a little pin bending.

The data sheet is too big to attach. get it here:

http://www.mif.pg.gda.pl/homepages/f...137/6/6021.pdf
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Old 19th November 2009, 01:35 AM   #4
sphinx is offline sphinx  Canada
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google usually is my friend, but in this case, it's not that helpful

The JAN6418 are a little too tiny. If those are sub-miniature, I guess I'm looking for "small". Perhaps 50-70% of the size of a 12AX7.
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Old 19th November 2009, 01:40 AM   #5
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How about the 5670, which is in the little peanut-size envelope like a 6AK5.
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Old 19th November 2009, 01:51 AM   #6
sphinx is offline sphinx  Canada
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Quote:
Originally Posted by wrenchone View Post
How about the 5670, which is in the little peanut-size envelope like a 6AK5.
5670! Yes! That's just might be the one I need. With that p/n, I found other possibilities... 6N3P 2C51 WE396A. With your help, google is my friend again
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Old 19th November 2009, 01:56 AM   #7
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Quote:
Originally Posted by sphinx View Post
5670! Yes! That's just might be the one I need. With that p/n, I found other possibilities... 6N3P 2C51 WE396A. With your help, google is my friend again
Duncan amps TDSL is also a great piece of kit for this. If you know the base and envelope you want (thery are standard) you can use its search feature to identify only tubes with those features. Of course, you need to know what base and envelope code you are looking for, but once you have a lock on that it makes finding a suitable tube easier.
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Old 19th November 2009, 06:06 AM   #8
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6N3P is listed as an equivalent to 5670, but it's in a more usual-sized envelope like a 6U8 or 12AX7 or similar. I know - I ran across the litle 5670 in my stash just late last night, got the data, and made the comparison.
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Old 19th November 2009, 06:12 AM   #9
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yeah, american 5670 / 2c51? is smaller envelope than 6N3P. Rest is similar though.
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Old 19th November 2009, 02:24 PM   #10
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all good info... thanks!
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