thats geniuenly intrestingAt audio frequencies, it appear the two 10mH inductors present a shunt path in parallel with the 8 ohm speaker, i.e 20mH. The -3dB cutoff occurs when the reactance of 20mH equals 8 ohm. 8=2*Pi*f*0.02H.
Solving for f: f= 8/(2*Pi*0.02H) = 63.7Hz.
Also you can try to use a halogen lamp 230/12v transformer's secondary winding, but I don't know what inductance it has. But still, it will not work, because of dc current passing through it.
Much better to skip that SE version and go PP, circlotron. At low impedance the powersupplies capacitances are no issue.(contrary to high impedanxe tube based circlotron). The beauty of it would be the possibility of being able to use truely paired output devices of the same type without needing any inductive devices (alltough, especially regarding speaker protection, a split load transformer mc intosh style could also be a good idea)
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the description calls it a complementary bridge circuit, but to me it looks like a circlotron, what did i miss?
Seems like many better options than this.
Inductors needed are expensive
And is basically low power , high distortion junk amplifier.
Just use your other transistor for current source.
And more conventional input circuit for actual gain.
Inductors needed are expensive
And is basically low power , high distortion junk amplifier.
Just use your other transistor for current source.
And more conventional input circuit for actual gain.
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- did anyone build this amplifier or is it just purely theoretical. (ZEN split load single ended amplifier i found in this tubeCAD post)