OTL Asylum

RE: (New?) OTL candidate scheme

81.216.133.244

In Reply to: RE: (New?) OTL candidate scheme posted by cellai@space.it on April 08, 2008 at 08:42:07

As far as I can see this is a classic SEPP output stage where the upper tube works as a cathode follower and the lower tube as an ordinary cathode grounded stage. The main problem with this stage is that it is very unbalanced as the upper cathode follower has much lower output impedance than the lower tube, this give a lot of 2nd order harmonic distortion. Futterman solved this problem by feedback from the output to the phase splitter cathode, (he originally used a split load phase splitter) thereby both tubes give the same output impedance and the unbalance problem is solved. An inverted variant of the Futterman give the lowest possible output impedance with any given tubes and the tubes then both works as cathode followers with very good balance and lower output impedance than the Circlotron. Please see this link for more theory about OTL circuits http://members.aol.com/aria3/otlpaper/otlhist.htm

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RE: (New?) OTL candidate scheme - cellai@space.it 01:33:10 04/14/08 (0)

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