[NLRS] Looking for 70cm 4CX250B amp design....

[Dr. Gerald N. Johnson]

You want TINY look at the Avago VMMK amplifiers. Three terminal 0402, 
makes the other parts look big.

73, Jerry, K0CQ

On 1/9/2014 4:24 PM, Ronald Bergantzel wrote:
>
>
> Hello All !! I got to share something here - Why use the 4CX250's ?? Just spend the $150 for a GS35 and have a tube amplifier that is considerable more robust ( read reliable and forgiving ) , has the ability to run almost any output you would ever want and MUCH simpler to construct  (see - QRO via Russia website ) .You do not need a seperate grid and screen supply....  Just for instance , I fired my GS35 up last weekend and had HEAVY Frost on the 2M12 antenna  - had 255 watts reflected and 1.5 kw out and had NO damage - I even used several short transmissions to thaw - out the driven element !! Also I never have to worry about over - driving it . In closing , with proper power supply design the GS35 has NO problems running the digital modes at 100% duty cycle at 1.5 kw output on multiple amplifiers that I have built / run  . Just a thought involving real world past experiences ...... 73s and GL on the amp Project !! Ron KA0RYT
> P.S - Projects that I am currently working on - Modifying several ex-broadcast Thompson  TH347 cavitys for legal limit on 1296 and 432 along with very low noise preamps for 1296 using some of the newest devices (can we say tiny SMT ? ) ....RB
> --------------------------------------------
> On Thu, 1/9/14, Matt Burt<kf0q at hbci.com>  wrote:
>
>   Subject: Re: [NLRS] Looking for 70cm 4CX250B amp design....
>   To: "Floyd Patten"<bud.patten at frontiernet.net>
>   Cc: nlrs at mailman.qth.net
>   Date: Thursday, January 9, 2014, 4:00 PM
>
>
>
>   Hello Bud,
>
>   Not exactly what you are looking for but really close and
>   some good
>   reading found here:
>
>   http://www.qsl.net/w8ujx/432amp.pdf
>
>   Good luck,
>
>   Matt - KF0Q
>
>   ----- Message from geraldj at netins.net
>   ---------
>   Date: Thu, 09 Jan 2014 15:39:43 -0600
>   From: "Dr. Gerald N. Johnson"<geraldj at netins.net>
>   Reply-To: geraldj at netins.net
>   Subject: Re: [NLRS] Looking for 70cm 4CX250B amp design....
>   To: nlrs at mailman.qth.net
>
>   >
>   >
>   >  I should have the print magazine somewhere, and I know
>   I have it on
>
>   >  DVD in the form of a pdf file per issue and the scans
>   are sharp.
>   The
>   >  whole issue is nearly 18 mb, way to big for an e-mail
>   attachment.
>   IF
>   >  Donn's offer doesn't work I can post it temporarily on
>   an FTP
>   server.
>   >
>   >  The output tank on that design is dual band but I think
>   it can
>   easily
>   >  be trimmed to be single band 432 only. It will probably
>   need a new
>   >  grid circuit for 432. I'm sure there have been a few of
>   those
>   >  published.
>   >
>   >  73, Jerry, K0CQ
>   >
>   >  On 1/9/2014 2:27 PM, Floyd Patten wrote:
>   >>
>   >>
>   >>  Do any of you have a copy of the Feb '70 issue of
>   HR with the 'RIW
>
>   >>  tripler/amplifier design? I'm looking for a
>   stripline 70 cm amp
>   to
>   >>  build.
>   >>
>   >>  Tnx,
>   >>  Bud
>   >>  w0lcp
>   >>
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