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Class-A most of the the time, and also...

Sure, if you drive it harder it will eventually transition into AB --this is to be expected. Nonetheless, it will stay within class-A approx 90% or more of the time with normal usage.

BTW: I've tried the 12B4A split-load with the EL84. Surprisingly, it was a pretty lack-lustre in sonic results. Bottom line: the split-load inverter just was not found to be sonically comparable to the long-tailed pair fro driving the EL84. In fact, it's much more than a subtle audible improvement with the long-tailed pair.

As far as CCS implementation: I'm not entirely sold on CCS usage. I suspect they can introduce more low-level harmonic artifacts than is generally assumed. And BTW: 32mA is much more current than you really need for clean triode-connection operation at the 5-watt level. It sounds much better with 24/25 mA.

As for the "too much gain" concerns: carefully re-read my previous posts here. There is a sound reason I included the 12AU7 input stage which has nothing to do with the additional (yes, unneeded) gain the stage provides.

You seem to be quite interested in this circuit. I'm curious, Why not suspend your disbelief, try it out, and then judge for yourself? Then you can get back with me and we can discuss your impressions.

Cheers,

-T.M.


Edits: 05/29/09 05/29/09 05/29/09
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