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Internet searches don't produce a list...maybe someone here knows...
Follow Ups:
There's the 6EL4, with a mu of 2000. Or the 6BD4 with a mu of 1650. However, they need around 20000V on the plate, so it's unlikely to be of much use to you...
Edits: 09/10/12
If you take a normal pentode or beam-power tube and connect the two grids (control and screen) together (not the usual triode connection), you will get an extremely high mu factor. So high that the grid cut-off voltage will be very low. However, the plate voltage is not limited to the maximum screen voltage, as in the normal plate-screen connection for triode use.
For an example, see the high-voltage power supply on page 382 of Elmore and Sands, "Electronics: Experimental Techniques", McGraw Hill 1949 (National Nuclear Energy Series, Manhattan Project Technical Section). This power supply uses two 807s, each connected per above, to make high-mu high-voltage triodes. In that example, mu = 350 and gm = 2000 umho. Since the 807 is not octal, try 6L6 or 6BG6 for almost the same result. I would be curious to see the result with a lower-power pentode such as 6AC7 or 6SJ7.
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I bet the 6bk4 wins at 1000.
Might be difficult to use below 1000 volta on the plate.
..
Builder of MagneQuest & Peerless transformers since 1989
This tube series is metal, but the GT version is glass. I purchased dozens of 12SF5GTs last year in anticipation of building more amps with 12V octals.
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Buy Chinese. Bury freedom.
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Have Fun and Enjoy the Music
"Still Working the Problem"
See data page at link.
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Wouldn't solid-state discrete components be easier & cheaper?
Iczerman
There are no triodes but many pentodes.
You can download a software for free
that has a parametric search feature
that does what you are asking.
DanL
According to Duncan Amps TDSL:
12E5-GT Octal base 12.6v heater single triode, Mu = 121.6
The mu of a 12e5gt is 13.8
That's a very linear tube.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
The 12E5GT is apparently a 12 Volt version of the 6P5GT.
There's no such list that I've ever seen or heard of. Only a few octal triodes have mu of 100, and I don't think any were made above that.
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Buy Chinese. Bury freedom.
Try the RCA Receiving Tube Manual,
This link to the 25th edition may help...
Happy Listening
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Have Fun and Enjoy the Music
"Still Working the Problem"
Such as 6HS5: u=300, gm=65,000. However...this and others like it are beam triodes designed for TV HV regulator service. Audio apps are doubtful although current source might be possible.
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