[Amps] MFJ Analyzer for adjusting matching network...

[Peter Voelpel]

Hi Scott,

I just entered the Eimac website, opened their library page and found it
immediately:

 http://www.cpii.com/docs/related/22/AB5.pdf

73
Peter

-----Original Message-----
From: KB0NLY [mailto:kb0nly at mchsi.com] 
Sent: Samstag, 21. Februar 2009 17:17
To: Peter Voelpel
Subject: Re: [Amps] MFJ Analyzer for adjusting matching network...

I have been Google searching for that tube performance computer but keep
coming up with dead links, 404 and 400 errors, etc.  Do you know a source
for it online?

Thanks and 73!

Scott


----- Original Message -----
From: "Peter Voelpel" <df3kv at t-online.de>
To: "'Amps'" <amps at contesting.com>
Sent: Saturday, February 21, 2009 9:16 AM
Subject: Re: [Amps] MFJ Analyzer for adjusting matching network...


The plate load impedance depends roughly on the possible anode voltage
swing, not supply voltage, and on the mode (conduction angle) the tube is
biased for. The tube can´t be driven to zero volts on the anode and factor
1,8 is good for class B only.
I would expect tube Z therefore below 2k ohms in that example.

Best is to use the free Eimac "tube performance computer" to do the
calculations.

73
Peter

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of KB0NLY

The plate load impedance of your amplifier is expressed approximately as:
[(plate voltage in volts) divided by (1.8 times the plate current in
amps)].""
For me that would be 2400 plate volts and 600 ma of plate current max, this
works out to 2222 ohms.

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