Hello Styrkv,
thank you for your kind words. At some point I felt like killing the thread, but in the end I could not keep my hands from it

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Taking each of your points in turn.
1. Yes and no, I have seen EC use them in one their preamps. They are current sources for the input buffer fets and can be fitted or omitted as desired on the same pcb with no ill effects. I have no idea how they sound.
Please see the attached schematic for some starting values that will yield currents equal to their resistive counterparts.
2. I think it is a good idea to have a common phase splitter, in the sense that both bridge halves will receive identical signals. This of course, provided that voltage drive is utilised at the interface, hence the circuit split after the emitter followers and not the following transimpedance stage.
3. Vcc of the order of 33V, Vdd 43V, 650VA per channel, for 250Watts at 8 Ohms. With 12 output devices I believe the design can be pushed to 400W, in which case you would require rails of 42 and 52V respectively at 1KVA.
4. I though about using them too, but there is no need power consumption-wise, due to the bridging. Why have the extra capacitance though? Be aware that pinout is different.
Alas, I now need a sponsor to pay for all those pcbs, metalwork, etc!
