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RE: here we go again.......

While I'm not against CCS's as plate loads in general, I can't see the benefit in this application. MOSFET's at such low currents exhibit very low Gm and even though putting them in cascode multiplies their Gm, it's still too low for all practical purposes. BJT's would offer better performance here I think and a gyrator even better. In any case, why not just use a plain ole resistor as the load? Don't get me wrong, I'm not saying that this circuit doesn't sound very good (I'm sure it does), only that it might also sound very good with resistive loading while reducing complexity.

However, the biggest issue here IMO, is that the proposed amp using the 71A as the final, will be very low in power. The output tube will be running at a plate dissipation of .02x180=3.6W and If we assume a plate efficiency of about 20% it will have an output power of 0.7 watt. What's the sensitivity of the OP's speakers?

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