"Kenneth Scharf" ha scritto nel messaggio
...
If the problem is ONLY on 80 meters then the issue may be with the output
loading capacitor. On 80 meters the three gang variable loading capacitor
isn't big enough so the band switch adds an additional fixed cap in parallel.
Maybe that cap has gone bad or the switch is not making contact on that band.
Try putting a 500pf 500v cap in parallel with the output loading capacitor and
try it on 80 meters.

Should the output Pi network capacitance be too low (bad additional fixed
capacitor or faulty switch), one would just see a dull plate current dip and get
low RF output power, due to the Pi network overcoupling to the antenna. I see no
reason why it should also cause the final stage to become non properly
neutralized (as evident from the fact that the plate curent dip does not occur
as the same plate capacitor setting as for maximum output power)

73

Tony I0JX
Rome, Italy