[Amps] LA100 tuner for input to amp (Not LP100)

[Jim Klein]

I have one of these units,$50.00 shipped Cont USA...Jim..K7RDX..

On Sun, Mar 15, 2020 at 3:19 PM Jim Garland <4cx250b at miamioh.edu> wrote:

> As Jim mentioned, in 2006 LDG briefly sold an autotuner designed to match
> input networks of cathode driven homebrew amplifiers. The model was the
> AT-100AMP, a similar design to the  LDG LA100 autotuner and rated at 1-125
> Watts.  At the time, I and my buddies Jerry K8RA (SK) and Dan K8DR, all
> amplifier builders, bought several of the units, priced at $125/ea, for our
> own projects. They simplified construction of a homebrew amplifier by
> eliminating the need to gang the tank and input circuits together in order
> to use a single knob for bandswitching. They worked very well, and to my
> knowledge are still in use somewhere.
>
> I bought two of the tuners for future projects, and recently gave one to my
> buddy Bob, KK5QM, who just completed a lovely 80-10m amplifier running two
> 3CX800A7s. I'm saving the second one for a homebrew 8877 autotune amplifier
> I'm currently building. My new amp uses a powerful eight-core processor
> that
> hugely consolidates and simplifies the controller hardware. The software
> and
> controller hardware are now mostly working, but assuming COVID-19 doesn't
> get me first, the entire project is likely to take a couple of years to
> finish. I envisage it as basically a modernized Alpha 9500 on steroids.
> 73,
> Jim W8ZR
>
> > -----Original Message-----
> > From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim
> > Sent: Sunday, March 15, 2020 11:49 AM
> > To: amps at contesting.com
> > Subject: Re: [Amps] LA100 tuner for input to amp (Not LP100)
> >
> > It was written by Jerry Pittigner, K8RA now a Silent Key. His amplifier
> > was in one of the ARRL handbooks as a 3cx1200Z7 amplifier project.
> >
> > I tried to use one on a 2ea 3CX800 amplifier and did not like its
> > performance.
> >
> > Went to an input board with variable caps on both input and output.
> >
> >
> > Thanks
> > 73
> > Jim W7RY
> >
> > On 3/14/2020 5:37 PM, Robert wrote:
> > >
> > >
> > > In the 2006 ARRL Handbook is article on HB 3CX1500D7 amp.   This amp
> uses a
> > > LDG antenna tuner for the input circuit.
> > >
> > > A modified LA-100Pro
> > >
> > >
> > >
> > > It's not possible from the article to determine who the author is.
> > >
> > >
> > >
> > > Who wrote the article?  is first Question.
> > >
> > >
> > >
> > > And if he's on list, still like the LA100 being used as tuned input??
> > >
> > > seems like viable path for my next HB project.
> > >
> > >
> > >
> > > 73 W5AJ
> > >
> > >
> > >
> > >
> > >
> > > Robert
> > >
> > > Midland, Texas
> > >
> > >
> > >
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