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Circlotron with 12AT7, 6SN7, 6080 & feedback
77.43.10.3 |
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Posted on May 14, 2009 at 09:17:46 | ||
With reference to my last post of March 28 2009 (comparison of Modified Futterman vs. Real Futterman by using the very same tubes 12AT7, 6SN7, 4X 6080), I have just found the corresponding (and missing) circlotron schematic. It resembles somewhat the GRAAF GM20, but in this case there is a differntial DC feedback too. With respect to the previous Futterman/Modified Futterman cases the preliminary LT Spice simulations of this specific topology looks very good (it exhibits almost no second harmonic at all and only a quite normal third harmonic level). Due to DC coupling the amplitude and phase margins are excellent. LT Spice model is available on request. |
Circlotron schematic, posted on May 14, 2009 at 09:21:49 | |
And this is the schematic. |
Circlotron output impedance, posted on May 18, 2009 at 00:22:00 | |
LT Spice model says 2.5 Ohm (with feedback). Larger schematic and other answers have been sent to your mail. |
Lessee if a gif file will work., posted on May 19, 2009 at 09:39:19 | |
Posts: 4769
Location: Minnesota Joined: April 24, 2002 |
This is the M-60 MkII.3. |