The .47uF and 477k is for LF roll off. Miller capacitance enters into HF and is much more complicated to calculate. It is often worse than it appears as the 12AX7s must supply the current to charge this capacitance, the 12AX7s output impedance is not the only factor. Calculating Miller capacitance for UL op is involved.
Designing Common-Cathode Triode Amplifiers.
Designing Common-Cathode Triode Amplifiers.
From another thread:
So how can I find 16kHz value?
Posted by fdegrove
One caveat, the amp is seriously limited in high frequency response by its driver stage, it's starts to roll off gently from ~ 16KHz.
So how can I find 16kHz value?
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