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Hello Carlo,
=20
There is no real Comparison between the Henry 8K and the Commander 2500E =
(or ANY other amplifier!), but I'll try.
=20
Henry 8K uses the 3CX3000A7 (4000 watt plate dissipation, 225 watt =
grid).
They use toy tubes! (3CX800A7 800 watt plate dissipation, 4 watt grid! =
[yes, FOUR WATT GRID!!]).
Henry 8K uses OIL FILLED transmitting type filter capacitor (like you're =
supposed to!)
They use "computer type" in a bank.=20
=20
Henry 8K use a choke input HV power supply which has superior load =
regulation
I haven't seen their schematic, but there is no room in the unit for a =
choke and I doubt they use one.
=20
The 8K can do 5 KW+ out in all modes, and while Henry doesn't spec it =
there, many get 7 KW with drive
They claim 2000 w for all modes, 3500 w for SSB/CW
All Henry HF amps is instant on, ready for DX NOW!
They have to wait for warm up.
=20
The 3CX3000A7 is $795 (need one tube only) (at discount)
The 3CX800A7 is $435 PER tube X 3 $1305 (at discount)
=20
The single tube (3CX3000A7) is superior for IMD and Harmonics, and much =
superior to the 3CX800A7 when three tubes are used.
=20
>From the Eimac book, the 3CX800A7 is rated in RF amplifier cathode =
driven class AB2 at 750 watts output.
>From the Eimac book, the 3CX3000A7 is rated in RF amplifier cathode =
driven class AB2 at 7260 watts output !!!
=20
8K has optional presets available to tune to your favorite spot at the =
flip of a switch!=20
8K RF deck/ps can be remoted up to 100 feet away with the control head =
on your desk.
8K tunable from 1.8 to 30 MHz continuous.=20
8K (all Henry amps) use professional premade "diode stacks" at very =
conservative ratings, not individual diodes.=20
8K (as most Henry amps) can be made in 3 phase and any input voltage you =
want!
8K has built-in REAL BIRD wattmeter with 2 slugs provided for forward =
and reflected power.
8K can operate into some higher SWR, other amps will reduce output or =
shut off when you get 1.5 or 2 to 1 SWR!
=20
Why buy an amplifier with such spectacular performance? Some people just =
want the BEST!
=20
I could go on and on...........
See the 8K at http://radiodan.com/Henry/Amp_specs/Ultra_info.htm
=20
With high RF currents and high voltages, you just can't afford anything =
but the highest quality parts and NOT all jammed together in a small =
space!
=20
73, Dan Magro
Radiodan W7RF, Portable Clinic =20
High quality Henry Radio RF Power Amplifiers for LESS!
New, used, unusual, classic radios, accys & RF POWER!
http://www.radiodan.com RFpower@radiodan.com
A trip to our web site is worth the click!
I would like to buy an amplifier.=20
I'm intetersted in Henry 8k ultra or HF-2500E.I=20
would like to have some impressions of use. Is there anybody with these=20
amplifiers ? Which is the best ?Thank you =
Carlo
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<BODY bgColor=3D#ffffff>
<DIV>
<DIV><FONT color=3D#000000 size=3D2>Hello Carlo,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>There is no real Comparison between the Henry 8K and =
the=20
Commander 2500E (or ANY other amplifier!), but I'll try.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Henry 8K uses the 3CX3000A7 (4000 watt plate =
dissipation, 225=20
watt grid).</FONT></DIV>
<DIV><FONT size=3D2>They use toy tubes! (3CX800A7 800 watt plate =
dissipation, 4=20
watt grid! [yes, FOUR WATT GRID!!]).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Henry 8K uses OIL FILLED =
transmitting type=20
filter capacitor (like you're supposed to!)</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>They use =
"computer=20
type" in a bank. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Henry 8K use a choke input HV power =
supply which=20
has superior load regulation</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>I haven't seen =
their=20
schematic, but there is no room in the unit for a choke and I doubt they =
use=20
one.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2></FONT><FONT color=3D#000000 size=3D2>The 8K can do =
5 KW+ out in=20
all modes, and while Henry doesn't spec it there, many get 7 KW with=20
drive</FONT></DIV>
<DIV><FONT size=3D2>They claim 2000 w for all modes, 3500 w for=20
SSB/CW</FONT></DIV>
<DIV> </DIV>
<DIV><FONT color=3D#000000 size=3D2>All Henry HF amps is instant on, =
ready for DX=20
NOW!</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>They have to =
wait for warm=20
up.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2></FONT><FONT color=3D#000000 size=3D2>The 3CX3000A7 =
is $795 (need=20
one tube only) (at discount)</FONT></DIV>
<DIV><FONT size=3D2>The 3CX800A7 is $435 PER tube X 3 $1305 (at=20
discount)</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>The single tube (3CX3000A7) is =
superior for IMD=20
and Harmonics, and much superior to the 3CX800A7 when three tubes are=20
used.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>From the Eimac =
book, the=20
3CX800A7 is rated in RF amplifier cathode driven class AB2 at 750 watts=20
output.</FONT></DIV>
<DIV><FONT size=3D2>From the Eimac book, the 3CX3000A7 is rated in RF =
amplifier=20
cathode driven class AB2 at 7260 watts output !!!</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>8K has optional presets available to =
tune to=20
your favorite spot at the flip of a switch! </FONT></DIV>
<DIV><FONT size=3D2>8K RF deck/ps can be remoted up to 100 feet away =
with the=20
control head on your desk.</FONT></DIV>
<DIV><FONT size=3D2>8K tunable from 1.8 to 30 MHz continuous. =
</FONT></DIV>
<DIV><FONT size=3D2>8K (all Henry amps) use professional premade =
"diode=20
stacks" at very conservative ratings, not individual diodes. =
</FONT></DIV>
<DIV><FONT size=3D2>8K (as most Henry amps) can be made in 3 phase and =
any input=20
voltage you want!</FONT></DIV>
<DIV><FONT size=3D2>8K has built-in REAL BIRD wattmeter with 2 slugs =
provided for=20
forward and reflected power.</FONT></DIV>
<DIV><FONT size=3D2></FONT><FONT color=3D#000000 size=3D2>8K can operate =
into some=20
higher SWR, other amps will reduce output or shut off when you get 1.5 =
or 2 to 1=20
SWR!</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Why buy an amplifier with such spectacular =
performance? Some=20
people just want the BEST!</FONT></DIV>
<DIV><FONT size=3D2> </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>I could go on and =
on...........</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>See the 8K =
at <A=20
href=3D"http://radiodan.com/Henry/Amp_specs/Ultra_info.htm";>http://radiod=
an.com/Henry/Amp_specs/Ultra_info.htm</A></FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>With high RF currents and high =
voltages, you=20
just can't afford anything but the highest quality parts and NOT all =
jammed=20
together in a small space!</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV> </DIV>
<DIV><FONT color=3D#000000 size=3D2>73, Dan Magro<BR>Radiodan W7RF, =
Portable=20
Clinic <BR>High quality Henry Radio RF Power Amplifiers for=20
LESS!<BR>New, used, unusual, classic radios, accys & RF POWER!<BR><A =
href=3D"http://www.radiodan.com";>http://www.radiodan.com</A> &=
nbsp; <A=20
href=3D"mailto:RFpower@radiodan.com";>RFpower@radiodan.com</A><BR>A trip =
to our web=20
site is worth the click!<BR></FONT></DIV></DIV>
<DIV> </DIV>
<DIV><FONT color=3D#000000 size=3D2><BR>I would like to buy an =
amplifier.=20
</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>I'm intetersted in Henry 8k ultra or =
HF-2500E.I=20
<BR>would like to have some impressions of use. Is there anybody with =
these=20
<BR>amplifiers ? Which is the best ?Thank=20
you &nbs=
p;  =
; =20
</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Carlo</FONT></DIV></BODY></HTML>
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