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Read the Post in new Window Read the Post in Threaded view  Post #20: E55L = 8233 by hagtech on 2008-01-01 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Yes, it is an E55L.  I wonder how stable it is.  Interesting to me how many of these "uber-tubes" are designed for RF operation.  Should make a wonderful oscillator.  The other find I came across was a pair of 6CL6.  Makes me...
Read the Post in new Window Read the Post in Threaded view  Post #37: Other Tubes by hagtech on 2008-01-19 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
That 8233 might do it.  Also noticed the 6CL6 in triode mode will get you almost there, but only a mu of 20.  The 6688 could be a substitute.jh...
Read the Post in new Window Read the Post in Threaded view  Post #18: A Bin Full of Tubes by hagtech on 2007-12-31 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
I was rummaging through a pile of tubes and came across a pair of 8233.  Medium size tube, gold pins, PQ.  I think it might have been a video output tube for an old Tek scope.  So I looked it up on Duncanamps.  10W plate dissipati...
Read the Post in new Window Read the Post in Threaded view  Post #19: The same as the European E55L? by Romy the Cat on 2007-12-31 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim, Isn’t it the same as the famous European E55L? If so then it is a very popular in certain circles tube and it is a good driver. I never tried it myself though and I can not comment about it sonic signature or how to use it. BTW, the way how you ...
Read the Post in new Window Read the Post in Threaded view  Post #23: E55L by Lucian on 2008-01-02 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Hello first, as I am new on this site... I have tried a number of high Gm pentode/triode tubes, including E55L and, of course, 7788. All are very linear when used as triodes, but do not bet on very low noise, if that is what you would be after. Th...
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