I have a SG-8 sig. gen. It uses a 6C4 Colpitts AF oscillator and a 12AU7 as a RF oscillator and cathode follower. When I change the tuning cap. I get no change in output signal . When I put my scope near the Rf Inductor coils there is plenty of RF being generated. I wonder if the B+ voltage is high enough for proper operation.
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