how much power dissipation are you able to get out of a single IRF240? It would be a trade off I guess. It seems that the design is already bandwidth challenged, or at least requires a lot of preamp muscle. I was think of making a cascoded/current sourced (I'll let Jam and Grey fight that one out) balanced line stage to drive it with, probably integrating it into one chassis/channel- more of an input stage than a preamp really(don't know if I already stated that). I would like to keep it to two stages for the sake of simplicity. My problem is that the heatsinks I have are not that great- 2.2c/w. I will be using them in groups, hoping to get this thing cool enough to push enough bias through for 20 watts. So, where do I compromise- More devices in the output with a driver, or less devices w/no driver and less power? My speakers are about 92.5db- 1w, but I do like to turn it up a little. I eventually will move these to just tweeter duty.
I think this is it:Jocko Homo said:Maybe you could provide a direct link to the circuit in question.
All links are death in the meantime (10 years old).
here the currently URLs to this excellent project:
check also out the associated links under the headline
Single Ended Pure Class A Power Follower Amplifier
about the URL
Andrea Ciuffoli - Home Page
THis topology as "Front-End" could provide an additional sound enhancement:
For me the most interesting version for low Cin is those from post 27 aboutParallel devices is cool. Just keep in mind that some point the cumulative capacitance from the gates will start to bog down whatever you're using to drive the output stage. High frequency response will suffer.
(Ladislav Bunta's advanced circuit).
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