|Ameritron Al-811 linear amplifier gives you plenty power
to bust thru QRM.
You get a quiet desktop linear thats so compact itll slide right
into your station -- youll hardly know its there ... until QRM
sets in. Conveniently plug it into your nearest 120 VAC outlet
-- no special wiring needed. Three tough 811A transmitting
tubes, extra heavy duty power supply, all HF band coverage,
pressurized ventilation, tuned input, dual illuminated meters,
adjustable ALC & more.
The first 600 watts make the
The Al-811 gives you 600 watts PEP output -- thats nearly 2 full
S-units over your barefoot rig. That could mean the difference
between hearing, "Youre Q-5 armchair copy" and, "Sorry cant copy
you, too much QRM." Now you wont have to stand aside while the
"big guns" steal your DX. Youll be able to log some of those
stations first. Going from 600 watts to the full legal limit
gives you less than one S-unit increase. But is that fraction of
an S-unit worth the 3 or 4 times more money itll cost you?
AL-811 gives you a powerful punch at a price thats easy on your
All band, All mode coverage
The AL-811 covers all HF bands. Theres no compromise on WARC and
most MARS bands -- you get 100% rated output. You can operate
the AL-811 on all modes. Get 600 watts output PEP SSB and 500
watts output CW. You even get 400 watts on demanding continuous
modes like RTTY, SSTV, FM and AM.
How the low cost 811A tube resists premature failure --
even when your amplifier is mistuned
First theyre constructed with widely spaced elements that
minimize the chance of touching and causing a short -- even if
the plate gets hot enough to melt. Second they use a directly
heated thoriated tungsten filament cathode that prevents the
electron emitting layer from instantly stripping off -- even if
mistuning causes a sudden, sever current overload. The Ameritron
AL-811 is excellent for the newcomer because its tough enough to
withstand momentary mistuning. And the tubes are so inexpensive
that you can replace one for mere pocket change.
The Ameritron advantage: Extra heavy duty power supply
gives you peak performance year after year
The heart of the AL-811 power supply is its heavy duty power
transformer with high silicon steel core weighing a hefty 17
pounds. A full wave bridge using 52.5 ufd of total capacitance
(four 210 ufd, 470 volt capacitors) produces 1500 volts under
full load and 1700 volts no load. Thats excellent high voltage
regulation! Full height computer grade filter capacitors with
screw terminals are used -- not short stubby. light duty
soldered-in "high technology" capacitors that cant dissipate the
heat generated by high current.
Rectifier diodes are rated for a massive surge current of 200
amps. They wont blow even if you accidentally short the high
voltage supply. Wire wound, 7 watt, 50 K ohm equalizing
resistors safely protect each filter capacitor -- not 2 watt,
100 K ohm carbon composition resistors that can open and cause
your filter capacitors to explode or fail. The Ameritron AL-811
power supply is built tough so you get peak performance year
Tuned input provides excellent load for any rig
A Pi-Network tuned input provides a 50 ohm load for your rig.
Even fussy solid state rigs can deliver their full drive to
AL-811. Low loss slug tuned coils -- tunable from the rear panel
-- let you optimize performance. High quality low drift silver
mica capacitors maintain proper tuning.
Output tank: optimum Q on each band
the low loss pi-network output tank of the AL-811 has been
carefully designated for optimum Q on each band and built with
quality RF components. The result is peak performance over each
band, wide impedance matching range and exceptionally smooth
tuning with efficiencies close to 70%. Even a 3:1 SWR load wont
damage the tubes or tank components. A ball bearing vernier
reduction drive makes plate tuning precise and easy.
Quiet pressurized ventilation keeps your tubes safely
A quiet blower pressurizes the cabinet with a large volume of
air flow. It keeps the 811A tube temperature well below the tube
manufacturers rating -- even with a key down carrier at 400
watts output -- without the overwhelming noise of oversized
Two illuminated meters
Two illuminated meters give you a clear picture of your AL-811
operating conditions so you can tell right away if something is
wrong. the Grid Current meter continuously check for improper
loading. The other meter switches between high voltage and plate
current to warn of abnormal conditions.
Ameritron exclusive Adapt-A-Volt power transformer
Too high line voltage stresses components and causes them to
wear out and fail. Too low line voltage causes a "soft-tube"
effect -- low output and signal distortion. Ameritrons exclusive
Adapt-A-Volt power transformer has a special buck-boost winding
that lets you compensate for stressful high line voltage and
performance robbing low line voltage. This makes your components
last longer and gives you peak performance -- regardless of your
For lightning fast QSK operation, use the optional external
QSK-5, electronic PIN diode switch.
An Operate/Standby switch lets you run barefoot, but you can
instantly switch to full power if needed.
A transmit LED tells you when your rig is keying your AL-811.
A 12 VDC keying relay makes it compatible with solid state and
tube rigs. Built-in back-pulse canceling diode protects your
rigs keying circuit.
Shielded RF compartment. One year limited warranty. UPS
shippable. Shipped with transformer installed and wired for 120
VAC. Draws 8 amps at 120 VAC.
Made in USA