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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: RE: Here's a thought posted by Genp on July 13, 2016 at 16:31:11:
I admittedly got a little lazy and used that same operating point but on the very similar 6SL7 instead, since I could obtain the parameters for that tube much easier. Following that, I went back and had a look at the 6EM7 datasheet and for your set up as shown, the OP is at Va = 152V, Vg = -2V, ra = 50K and mu = 64. I didn't check your math, but keep in mind that the impedance looking into the cathode is in parallel with Rk and I don't think that you took that into account. In any case, I've developed an excel spreadsheet that calculates Zo, gain, etc., so with the aforementioned ra and mu values that correspond to this specific OP, the numbers become:Zout -- bypassed = 33.3K
A -- bypassed = 42.7Zout -- unbypassed = 64.3K
A -- unpypassed = 22.9As you can see, the input section of the EM7 is hardly high gain in the unbypassed config. Going with say a 6SN7 that's going to yield a mu of ~17 will not make that much of a difference, but of course that will have to be a judgement call on your part. Just let us know what happens and if you happen to try both schemes it'll be all the more interesting.
Edits: 07/13/16 07/13/16
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- RE: Here's a thought - sideliner 20:02:34 07/13/16 (0)
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