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

To: "'Amps'" <amps@contesting.com>
Subject: Re: [Amps] MFJ Analyzer for adjusting matching network...
From: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 21 Feb 2009 16:16:45 +0100
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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@contesting.com [mailto:amps-bounces@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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