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Other Methods

It's my opinion that ITs should be avoided in any DIY design unless a thorough electrical analysis of the transformers can be made. The problem is phase shift, and it can be excessive not only at the edges of the passband, but at random frequencies within the passband as well. If the goal is to minimize distortion induced by occasional grid current (and the subsequent recovery time of bias voltage), there are alternatives to transformers. Reactive (choke) coupling is my favorite, in conjunction with a low Rp driver. Resistive coupling also resolves the problem. Both methods usually require one or more negative supplies.



Edits: 02/27/17
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