![]() So our simulation using 30 volt rails we can deliver around 15.5 volts rms into 8 ohm which is 30 watts rms. ![]() This means that the amp will deliver less maximum voltage swing into a load than with ordinary transistors (but you won't notice that listening to it). See how the drive voltage needs to be higher. This shows the output voltage and the FET gate voltage. The effect of that is that when loaded into say 8 ohms is that the driver voltage to the gates needs to go higher. What all that means is that depending on the load current required (if we want more current), then the gate voltage needs to increase. See posts in this forum for details and guidelines. The FET gate works on voltage, not current and so to get it conduct harder we increase the gate voltage. Forum devoted to classified ads from AudioKarma Vendor Sponsors and Moderators ONLY. This means the ordinary transistor can be made to conduct harder by supplying it with more base current. Whereas a transistor has current gain, a FET has the different property of 'Transconductance' which is how much the Drain current varies in relation to the Gate to Source voltage. I think what Jacques is getting at is that the FET's don't behave quite like ordinary transistors.
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