I can testify to what OZ9AAR states below. I´m also using the
same kind of amp
for 144 MHz EME, however I use 4CX250B´s in it. It runs like a
dream and my
amp puts out much higher power then OZ9AAR´s, I run it in class C
and only
use CW. It´s a very easy to build design and works very reliable,
I know of atleast
two other Swedes using same design with good result.
73, Jim SM2EKM
------------------------------------
-----Ursprungligt meddelande-----
Från: chg@logicio.com [SMTP:chg@logicio.com]
Skickat: den 23 april 2001 20:05
Till: gclute@home.com; amps@contesting.com
Ämne: RE: [AMPS] 4CX350A
I have used a amp based on 3 times 4CX350A on 2M moonbounce for several
years. The construction was originally from YU1AW, and was
shown in UKW-Berichte, using a stripline configuration. I ran the
amplifier with 2800VDC under full load, delivering approx 1600Watt
output (into a dummy load :-) The amp runs like a dream, and is still
using the same 3 tubes as when I built it 10 years ago.
If this is any good or not for your application, I don't know, as I
said, it has been running for many years for me on EME, with
very heavy use, most of the time it sat in the end of my garage, and it
was remote monitored from my shack (because of cable loss
and noise from the blower)
Regards,
Carsten Groen, OZ9AAR
www.logicio.com/cgroen
-----Original Message-----
From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
Behalf Of George L. Clute
Sent: Monday, April 23, 2001 6:13 PM
To: amps@contesting.com
Subject: RE: [AMPS] 4CX350A
I should have qualified my question...i.e. running a typical operation
of
2000 to 2500 DC plate voltage under 250 Mhz in Class AB1 configuration.
Has
anyone constructed three 4CX350A's or 4CX300A's in parallel operation
with
one KW DC input. I suspect from the answers here that it has not been
accomplished and may be impossible to resonate the plate circuit on
frequencies above 30 Mhz due to the plate capacitance of three tubes in
parallel.
Hip boots securely fastened at all times.
George W7LFD
-----Original Message-----
From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
Behalf
Of Bob Duckworth
Sent: Monday, April 23, 2001 4:17 AM
To: Dfmich@aol.com; amps@contesting.com
Subject: Re: [AMPS] 4CX350A
Dan-
You are correct. Tek employed a distributed amp
as well as some of the early RADAR gear.
One needs hip boots around here at times :-)
-bob
----------
| From: Dfmich@aol.com
...
| One would have to look at all the gory details to nail this down but
I am
| willing to bet that the 75 MHz amp for the Tektronix scope was a
distributed
| amplifier. The tubes is such an animal are not in parallel. Rather,
they
...
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