[AMRadio] info wanted on 4-400 linear amplifier


Anthony W. DePrato wa4jqs at mikrotec.com
Tue Aug 2 23:06:07 EDT 2005


Ed:
the Johnson Thunderbolt is a AB2  amp that uses 4-400A's check out this amp 
i think you might like the layout it uses a roller inductor instead of a 
varicap.
73 Tony wa4jqs

At 06:10 PM 8/2/2005 -0700, you wrote:
>I am planning to build a linear amp around a grid driven 4-400 tube. Can
>anyone suggest where I can find a suitable circuit with component values.
>I would like band-switching for 80, 40 and 20 meters. I will be driving
>it with a 25 watt carrier output rice box on AM. I don't like the one in
>the ARRL 1967 handbook because it requires you to open the lid and
>physically change taps on the coil and change tuning capacitors. I don't
>have any other older handbooks. Thank you.
>
>Ed K6UUZ
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Anthony W. DePrato WA4JQS
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Since 1962
South Sandwich Island Antarctic Dxpedition Group
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