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HF LINEAR AMPLIFIER
You are offerding on a lightly used Ameritron AL-811 HF Linear Amplifier. This unit has sat in the box under my operating console for the last few years after I moved. It has not seen much use, as I bought it for an little extra punch on SSTV. I never ran it over 350-400 watts. It is in excellent shape with the exception of one scratch as is indicated on the last photo. Looks like it rubbed the transceiver at some time beside it. Comes complete with manual, and will be shipped in the orginal boxes.
600W Output Linear Amplifier w/ 3 811A Tubes on 100/110/120V for US
Ameritron Al-811 linear amplifier gives you plenty power to bust thru QRM.
You get a quiet desktop linear that's so compact it'll slide right into your station -- you'll hardly know it's 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 Al-811 gives you 600 watts PEP output -- that's nearly 2 full S-units over your barefoot rig. That could mean the difference between hearing, "You're Q-5 armchair copy" and, "Sorry can't copy you, too much QRM." Now you won't have to stand aside while the "big guns" steal your DX. You'll 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 it'll cost you? AL-811 gives you a powerful punch at a price that's easy on your wallet.
The AL-811 covers all HF bands. There's 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 they're 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 it's tough enough to withstand momentary mistuning. And the tubes are so inexpensive that you can replace one for mere pocket change.
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. That's 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 can't dissipate the heat generated by high current. Rectifier diodes are rated for a massive surgecurrent of 200 amps. They won't 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 after 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 won't 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 cooled with quiet blower pressurizes the cabinet with a large volume of air flow. It keeps the 811A tube temperature well below the tube manufacturer's rating -- even with a key down carrier at 400 watts output -- without the overwhelming noise of oversized fans.
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. Ameritron's 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 line voltage.
QSK Compatible for lightning fast QSK operation, use the optional external QSK-5, electronic PIN diode switch. Plus an Operate/Standyby 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 rig\'s keying circuit. Shielded RF compartment. Shipped with transformer installed and wired for 120 VAC. Draws 8 amps at 120 VAC.
160, 80, 40, 30, 20, 17 and 15 meter bands
Circuit type: Pi-network, slug tuned coils
Maximum VSWR at resonance: 1.3:1
2:1 VSWR bandwidth: 15%
Maximum drive power
permissible: 85 watts
Typical drive for
rated output: 65 watts
Typical SSB PEP voice operation: over 800
Typical CW continuous
operation: 600 watts
1/2 hour PEP two tone:
1/2 hour continuous carrier: 400
Negative going, 0-12V, adjustable, phono
Circuit type: full wave bridge rectifier
No load voltage: 1700V
Full load current: 700mA
Maximum draw at rated
output: 10A (120V
AC Input: 120V, 50/60 Hz
Multimeter: reads HV and plate current
Grid meter: reads PA grid current
Relay: keys amplifier when grounded. Sources
+12 VDC open circuit and supplies 100mA when
grounded. A built-in pulse canceling diode
protects the exciter.
RF input: SO-239, 50
RF output: SO-239, 50 ohms with
full power, into any SWR below 3:1.
NEMA 5-15P 120V grounded style.
Jack. Supplies up to 12 volts of negative
voltage for ALC control of exciters.
13 ¾” W x 8 1/8” H x 16” D
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