This is an integrated amp I use sometimes. It is likely the lowest distortion amp one could ever find. It is flat to DC and -.25 dB at 200 KHz. The circuit is pretty simple, JFET input and MOSFET output, and would be even simpler if so much protection had not been built in. Can you spot the reason why it is wise to include those features? Hint: component type. No need to analyze how the circuit works.
To avoid a red herring, double 3W resisters were used because they cost less than a 6W. That might matter because you could build this yourself and the components minus case and power supply would cost less than fifty dollars. It has been done for twenty if one had the usual stuff lying around already.
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