[SixClub] Looking: 4-65A Amplifier Circuits...

[Paul Stump]

Mike,

Thanks for the nice note.  I am thinking more and more about the
4-125A's.  A friend has some along with sockets I think.  Seems that
Grounded Grid is the best way to go, but I am still learning and
re-learning...

Actually, I have not been able to find a construction article using the
4-65A.  Although I think I might be able to shoe-horn them into other
designs - such as one for 4-125A's.

Anyway, I'm not going to rush into this as I need to build a good power
supply as well.  This is the fun of it all!

Going to a hamfest this weekend and will see wot-is-wot...

Cheers & 73,
Paul
NØLRF
(Who is REALLY enjoying 6 meters again and my thanks to the many who
QSL 100%-!)

--- Mike Rentfrow <mrentfro at hereintown.net> wrote:

> Hi Paul!
> 
> Welcome back to 6M.  The 4-65A tetrodes are nice and should put out
> near
> 500W CW when run _alls to the walls. My favorite bottle(s) are a PAIR
> of
> 4-125A's or a single 4-250A.  These two bottles can be run as GGAmps,
> wheras
> the 4-65A geometry is not friendly to the GGA cconfiguration with all
> grids
> at DC ground.  Of course, a pair of 125's /4D21's will go 1kw in and
> 750 out
> at 6 and so will a single 4-250A.
> 
> BTW, the station advocating use of GE or Moto amps is correct.  They
> make
> real nice ad on's and good fr much QRO
> 
> Gud luck es 73
> 
> Mike Rentfrow, W3/K7GMR
> 
> 
> ----- Original Message ----- 
> From: "Paul Stump" <foxstump at yahoo.com>
> To: "SixClub" <sixclub at mailman.qth.net>
> Sent: Sunday, January 15, 2006 8:26 AM
> Subject: [SixClub] Looking: 4-65A Amplifier Circuits...
> 
> 
> Greetings OM & YL,
> 
> First an introduction:
> I am a 55 year old male living in Eastern Kansas, USA, Earth. I have
> recently returned to 6 meters after a 40 year absence.  AM back then,
> SSB now.  I operate a Heathkit SB-110 into a 1/4 wave ground plane at
> the moment with a 3-element Yagi soon on the way to the roof tower.
> 
> My Question:
> Back in the 1960's I had some schematics for 6 meter linear
> amplifiers
> using the 4-65A vacuum tube.  I have searched the Web Over and not
> found any reference to such.  I do have the schematic from the Eimac
> 4-65A specification sheets and will work from that unless someone
> might
> kindly have reference to a book or web site with more details.
> 
> Thanks for your time and any advice.  Hope to work many of you around
> 50.125 MHz USB in the future.
> 
> 73,
> Paul Stump, NØLRF
> http://www.home.earthlink.net/~n0lrf/