Herzog, Bill and all,
It is a good thing that the input power and output power are in phase else
the input power would subtract from the output power instead of adding.
I was reading in my Orr's Handbook today and couldn't find anything about
input and output being out of phase in any type amplifier.
What he did write was that the instantaneous peak positive grid voltage
coincides with the peak plate current and that the instantaneous plate voltage
is at minimum at the same time because of the voltage drop across the
plate load impedance. The statement applies to grounded grid or cathode
configurations.
I suspect the confusion is related to the negative feedback inherent in a
grounded grid design and that feedback is out of phase with the input
signal.
It all makes sense when you think about it.
Back to the books.
73,
Gerald K5GW
In a message dated 3/28/2010 7:03:43 P.M. Central Daylight Time,
herzog@frontiernet.net writes:
Another way of looking at it that doesn't require definitions of in or
out of phase, and relative to what is the usually accepted fact that the
input power ADDS to the final's power.
==========================
RE: > Do it grid driven and GG and then tell me the relationships.
> >Geez, why we have to discuss basics here is beyond me.
REPLY:
Grounded grid: Cathode goes negative, plate goes negative. In phase.
Grounded cathode: Grid goes negative, plate goes positive. Out of
phase.
Sometimes even well-educated people misunderstand the basics, and
that's why it needs to be discussed. A passing grade in school should
be 100%, but alas, it isn't.
73, Bill W6WRT
==========================
Another way of looking at it that doesn't require definitions of in or
out of phase, and relative to what is the usually accepted fact that the
input power ADDS to the final's power.
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