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RE: Cathode bypass cap value 300B SET question

The plate resistance.

When you bypass a cathode you prevent local current feedback.

Unlike voltage feedback, that lowers the plate resistance, current feedback increases the plate resistance.

When the output tube's cathode is not bypassed to the lowest frequency of interest, the tube's plate resistance increases right at the frequencies that you need it to be low, the low frequencies.

The higher the tube's plate resistance is, the lower the damping factor of the amplifier will be and the amplifier looses it's ability to control the motion of the woofer cone.

On the other hand, if you are not using the amplifier full range or if your speakers don't need a high damping factor then a smaller value cathode bypass cap might be better.

Tre'


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Edits: 08/09/15 08/09/15
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