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Shared cathode resistor bypass question.

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In a differential power stage, where the A and B phase share a cathode resistor, should it be bypassed by a cap? I've heard that since the A and B phase cancel in the resistor, that the only signal in the resistor is the imbalance, so a cap is not necessary. I also see schematics where the cathode resistor is bypassed. Can I get away with no bypass cap, and still not raise the impedance of the stage? The idea is appealing, as any time I can eliminate a cap I like to do so. Can anyone shed some light on this?

twystd

Follow Ups:

If it's a differential output stage... - Allen Wright 16:16:22 11/10/09 (1)
- Thanks, (nt) - twystd 16:40:24 11/10/09 (0)

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