Manfred Mornhinweg wrote:
> Roger,
>
>
>> How does this negatively affect the components in a Pi-L network for say
>> 160 through 10, 6 meters, or say a strip line on two?
>>
>
> I would say that using a lower plate voltage affects these components
> POSITIVELY! Since the tube's capacitance stays the same, the lower load
> impedance resulting from the lower voltage and higher current makes the
> tube's capacitance less important, comparatively to the plate load
> impedance. This allows you to use a lower Q for the tank circuit, which
> is often advantageous for cutting down losses or reducing size. Note
> that a lower voltage does not FORCE you to use a lower Q! It only gives
> you more range of freedom to choose the Q that's optimal for your
> intentions!
>
I'm building up one rig using a pair of FU-728s, but have been thinking
about playing around with the obsolete Russian GU73B if I can find a
pair. One to use and a spare.Amateur power levels would allow the tube
to loaf along with a reasonable amount of air even if the FU728s are
probably more practical.
73
Roger (K8RI)
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