All
I have a GU-78 amplifier based on the Russian R-140 military station.
It turns out that the efficiency is low on 160 m and I suspect that the tank
circuit Q is low on 160 m.
However I am not sure if this is the cause. The tank circuit Q is not high,
that I can tell from the capacitor values.
Another symptom of non-optimal loading is that the screen current is negative
unless I really push the drive to very high output and very close to having
grid current.
I have tried to look for information about low Q tank circuit problems but no
luck so far.
Markku
OH2RA/OG2A/WW1C
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