[Amps] 4CX5000A in common grid circuit

[peter chadwick]

I'm not sure what you mean here by mu.

mu is dVp/dVg. Gm is dIp/dVg and ra is dVp/dIp

so mu is Gm times ra.


So for any given screen voltage, you can figure the mu, because at a given grid voltage, Va has increased or decreased (depending on phase) with control grid voltage and you can then figure out the plate current. Likewise, you can fix the screen volts and calculate the plate current at various points in the cycle and then apply Chaffee analysis. 

OK, it's long and messy but can be done by hand from the characteristic curves......

73

Peter G3RZP




========================================
 Message Received: May 05 2013, 09:38 PM
 From: "Markku Oksanen" <markku.a.oksanen at kolumbus.fi>
 To: "Carl" <km1h at jeremy.mv.com>, "g8on at fsmail.net" <g8on at fsmail.net>, "Ville Lintervo" <villelintervo at hotmail.com>, "amps at contesting.com" <amps at contesting.com>
 Cc: 
 Subject: RE: [Amps]  4CX5000A in common grid  circuit
 
 Hi
 I have all the components to build the grid supplies to fit the need, screen to +1600 V if necessary.I know the DC operating conditions need to be about the same no matter what the RF configuration is.
 I would still hope to find the a way to calculate the power gain in GG.I have a hard time finding the a way to translate tetrode (grid to screen grid) muu to equivalent triode muu.Or perhaps this is a silly question.
 Thanks
 MarkkuWW1C
 
 > From: km1h at jeremy.mv.com
 > To: g8on at fsmail.net; villelintervo at hotmail.com; amps at contesting.com
 > Date: Sun, 5 May 2013 09:41:01 -0400
 > Subject: Re: [Amps]	FW:  4CX5000A in common grid  circuit
 > 
 > That is a typical British understatement (-;
 > 
 > But also typical of many European signals.
 > 
 > Carl
 > 
 > 
 > 
 > 
 > >
 > > The G2DAF configuration has had, over many years, a very poor reputation 
 > > for producing broad signals.
 > >
 > > 73
 > >
 > > Peter G3RZP
 > >
 > > ========================================
 > > Message Received: May 05 2013, 11:07 AM
 > > From: "Ville Lintervo" <villelintervo at hotmail.com>
 > > To: "amps at contesting.com" <amps at contesting.com>
 > > Cc:
 > > Subject: Re: [Amps] FW: 4CX5000A in common grid circuit
 > >
 > > Markku,  Have you given a thought for g2daf -configuration tog serve your 
 > > purposes ? http://www.g4dmp.co.uk/g2daf-lin.pdfSM2CEW describes his 
 > > implementation with QBL5/3500 http://www.sm2cew.com/ampli.html  Ville 
 > > oh1jd
 > >
 > >
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