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So, next day there was again very weak sound. Probably a bad solder joint. I bought more mmjf201s, soldered them on adapter boards, measured with Run Off Groove's jfet tester 2.0, and messed with my solder joints until I got a set of 7 jfets with similar, stable Idss and Vp. BTW, it is better...

Many thanks! I re-soldered Q2, Q4 and Q5, now I'm getting plenty of gain both in 9V and 18V modes. Measurements: Vcc: 17.08 V Vref: 8.54 V Q1: 0.19 V Q2: 9.14 V Q3: 0.03 V Q4: 8.66 V Q5: 2.48 V Q6: 0.37 V Q7: 8.89 V

Hi, sorry to bump an old tread, but I have an issue with too little gain in my build. I have to bump FEED to max and BODY to min to get any breakup. The boost part seems to work OK, though I haven't tested it much. I'm using MMBFJ201, soldered to the board (a major PITA!). My measurements: Vcc...