600W Valve Linear Amplifier 10 - 160m uses 3 x 811A
Ameritron's AL-811 linear amplifier gives you plenty of power to bust through QRM!
You get a quiet desktop linear that's so compact it'll slide right into your operating position -- you'll hardly know it's there... until QRM sets in. And you can conveniently plug it into your nearest 240V mains outlet -- no special wiring needed.
You get three tough 811A transmitting tubes, extra heavy duty power supply, all HF band coverage, pressurised ventilation, tuned input, dual illuminated meters, adjustable ALC and much more for an incredible price!
The First 600 Watts Makes The Difference
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 log some of those stations first.
All Band, All Mode Coverage
AL-811 covers all HF bands. No compromise on WARC and most MARS bands -- you get a 100% rated output.
Operate AL-811 on all modes. Get 600 Watts output CW. You even get 300 Watts on continuous carrier modes like RTTY, SSTV, and FM.
The low cost 811A tubes resist failure because:
First, they're constructed with widely spaced elements that minimise the chance of elements 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, severe 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 a high silicon steel core weighing a hefty 17lbs.
A full wave bridge using 67.5 mfd of total capacitance (four 270 ufd, 450 volt capacitors) produces 1500 Volts under full load and 1700 Volts no load. That's excellent high voltage regulation!
Rectifier diodes are rated for a massive surge current of 200 amps -- won't blow even if you accidentally short the high voltage supply.
Wire wound, 7 Watt, 50 K Ohm equalising resistors safely protect each filter capacitor -- not 2 Watt, 100 K Ohm carbon composition resistors that can open and cause filter capacitors to explode or fail.
Ameritron's 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 the AL-811.
Low loss slug tuned coils -- tunable from the rear panel -- let you optimise 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 has been carefully designed for optimum Q on each band and built with top 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 tubes / tank components.
A ball bearing vernier reduction drive makes plate tuning safe, precise and easy.
A quiet blower pressurises 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 over-sized fans.
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 checks for improper loading. The other meter switches between high voltage and plate current to warn of abnormal conditions.
Exclusive Adapt-A-Volt Power Transformer
Too high of the 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. Your components last longer and gives you peak performance -- regardless of your line voltage.
Plus much, much more...
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 12VDC keying relay makes it compatible with all solid state and tube rigs.
Back-pulse cancelling diode protects the rig keying circuit. Shielded RF compartment. One year limited warranty.
Compact 16D x 133/4W x 8H inches. 30lbs. UPS shippable, has transformer installed and wired for 240V mains. Draws 8 amps at 240V.