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[AMPS] Input matching experiment

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Subject: [AMPS] Input matching experiment
From: w8ron@stratos.net (Ron)
Date: Fri, 18 Jan 2002 16:05:56 -0500
I think what you see here is maximum power transfer that occurs when the
source impedance is equal to the load impedance .
Without the network, they are not equal.
With the network , well , they are.
---
Ron



Jon Ogden wrote:
> 
> on 1/14/02 5:45 AM, Tom Rauch at w8ji@akorn.net wrote:
> 
> > A matching system in a GG class B or AB amplifier serves three
> > important functions:
> >
> > 1.) It matches impedances
> >
> > 2.) It provides a low impedance path to the chassis for tube
> > cathode harmonics
> >
> > 3.) It prevents cathode harmonics from reaching the exciter and
> > causing problems
> >
> > You can't do that with a broadband transformer. It requires a low
> > pass network with a low-reactance capacitor (compared to the
> > tube's driving impedance) shunting the tube cathode to ground.
> 
> Tom,
> 
> Correct me if I am wrong, but  doesn't the literature lists one more reason
> for having an LC based matching network in you amp?  It tends to act as an
> energy storage medium for when the tube is in cutoff - the old flywheel
> analogy.  A transformer wouldn't do the same thing.  Or do I have it wrong
> in that this "flywheel" analogy only applies to the tank circuit on the
> output of the PA...........
> 
> 73,
> 
> Jon
> NA9D
> 
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