Mr Nelson Pass, the designer: As many of you may know, First Watt is dedicated to exploring the performance quality of small simple power amplifiers. Here is the F5. We want to further push the performance boundaries of simple little amplifiers with a FET two-stage class-A push-pull design....
This is 2x25W JFET-MOSFET class-A push-pull custom amplifier by LJ Audio. Custom made only, approx lead time: 2 weeks.
Model: F5 Ver #1, June 2013 (protoyype).
The topology is familiar; a very simple two-stage conjugate-complementary circuit using two JFET transistors for the input amplification and two power MOSFET devices for the output.