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RE: Another thing ...

the resonance is between the C and the following L and the load on the tube only has an effect of the damping of the resonance.

The parallel combo of the load on the tube and the Rp of the tube determines the damping of resonance. Since the load is usually a magnitude larger than the Rp, the Rp will dictate the behavior of the resonance.

It should be noted that a CCS will effectively give you a source impedance driving the CL filter of the tube. A choke will lower in impedance as frequency goes down (lowering the source impedance) which decreases the damping increasing the magnitude of the peak but by the time you get to that point you are also rolling off any LF info that may excite the resonance.

(hope that made sense)

dave

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