[AMRadio] info wanted on 4-400 linear amplifier


zuu6k at juno.com zuu6k at juno.com
Wed Aug 3 00:02:39 EDT 2005


Thanks, Tony.

Ed K6UUZ


On Tue, 02 Aug 2005 23:06:07 -0400 "Anthony W. DePrato"
<wa4jqs at mikrotec.com> writes:
> 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
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> VP8BZL VP8SSI 3Y0PI V31SS ZD8JQS  WA4JQS/4K1 WA4JQS/KC4 WA4JQS/ZS1
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> 
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