>
>The output network becomes parallel resonant at dip and parallel resonant
>circuits have their highest impedance at resonance. Off resonance, the tune
>cap and inductor look like shunts to ground and the tube has to try to work
>into a lower impedance...thus the high current.
? Murphy said that things are more complicated than they look. A
pi-network is two L-networks in series. At resonance, an L-network is a
dead short. Thus, L-networks are not oprated at resonance. When my
SB-220 is tuned for max output on 3820KHz, a dipmeter shows that the tank
resonates several hundred KHz lower. Pi-networks are not like parallel
resonant tanks in days of yore.
cheers, Jeff
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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