Quest for DC coupled circlotron

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

While playing with my latest 'sim toy' (circlotron with cathode "current & voltage" feedback) I found out a possible way to eliminate a couple of capacitors.
The idea was to replace the grid resistors of the output stage with a current source (in this example 1 mA, possibly implemented by something similar to TL783) in series with a zener.
In sim world it works (see calculated output spectrum @ 1 A load current). The 1 mA current source promises a dynamic impedance close to 1M whereas the zener provides for some current swing at constant voltage.
In the next days I will try to eliminate the remaining coupling capacitors to find out more on this.

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Topic - Quest for DC coupled circlotron - 6AS7_6SN7 12:09:29 01/09/15 (9)

RE: Quest for DC coupled circlotron - ChasLieb 12:34:44 10/10/15 (1)

RE: Quest for DC coupled circlotron - 6AS7_6SN7 11:33:57 10/16/15 (0)

It works! - 6AS7_6SN7 00:58:56 01/10/15 (6)

I'll bite... - Lew 11:13:00 01/10/15 (5)

II RE: I'll bite... - 6AS7_6SN7 05:14:05 01/11/15 (1)

RE: II RE: I'll bite... - 6AS7_6SN7 06:06:25 01/11/15 (0)

RE: I'll bite... - 6AS7_6SN7 14:22:18 01/10/15 (2)

Thanks so much.. - Lew 09:03:23 01/12/15 (1)

RE: Thanks so much.. - 6AS7_6SN7 12:21:33 01/12/15 (0)

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