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Old 3rd December 2007, 05:59 PM   #1
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Default Transconductance of E88CC,6922,6N23P

I was just looking over some datasheets trying to pick a good Russian cathode follower tube, and was struck by how relatively high the transcondunctance of a little 6N23P was (over 12 mA/V). Thinking the Russians might be trying to pull my leg, I looked at some NOS E88CC and 6922 datasheets (which is what the 6N23P is supposedly a clone of), and sure enough, those manufacturers like Philips, Raytheon, and Telefunken list similar numbers. Is this the most incredible little tube that ever was and should be used for everything short of the finals, or (more likely) is there something I don't understand about how single figures like these are arrived at?
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell
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Old 3rd December 2007, 07:23 PM   #2
7N7 is offline 7N7  United Kingdom
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In the 7788 thread I have posted about the gm claimed by Russian manufacturers - at least on the higher gm valves.

In the specification for e.g. 6C45P, they allow a large tolerance and it is my experience that the measurements are usually at the bottom end of the scale. The European and American valves nearly always meet their specifications.

Plug them in and light them up
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Old 3rd December 2007, 08:51 PM   #3
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I've found also that Russian tubes from ePay have a wide spread of parameters. Poor technology, or they are selling factory rejects? I don't know, so prefer to keep in mind such a wide spread when designing something.
The Devil is not so terrible as his math model is!
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