Overview

Ameritron HF Power Amplifiers

Ameritron AL-811XCE Linear Amplifiers are quiet desktop models that are so compact, they'll slide right into your station, and you'll hardly know one's there until QRM sets in. AL-811XCE amplifiers give 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 it worth the 3 or 4 times more money it'll cost you? Not when Ameritron AL-811XCE amps give you a powerful punch at a price that's easy on your wallet.

AL-811XCE amplifiers cover all HF bands and there's no compromise on WARC and most MARS bands because you get 100 percent rated output. You can operate these amps 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. Ameritron AL-811XCE amplifiers are manufactured with three tough 811A transmitting tubes. Ameritron AL-811XCE amplifiers are excellent for the newcomer because they're tough enough to withstand momentary mis-tuning. Plus, the tubes are so inexpensive that you can replace one for mere pocket change.

The Ameritron advantage becomes apparent at the heart of the AL-811XCE amplifiers with their power supplies. These heavy duty power transformers feature a high silicon steel core weighing a hefty 17 lbs.! A full wave bridge using 52.5 ufd of total capacitance (four 210 ufd, 470 V capacitors) produces 1,500 V under full load and 1,700 V 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 surge current of 200 amps. They won't blow, even if you accidentally short the high voltage supply. Wire wound, 7 watt, 50K ohm equalizing resistors safely protect each filter capacitor--not 2 watt, 100K ohm carbon composition resistors that can open and cause your filter capacitors to explode or fail.

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-811XCE amplifiers. Low loss slug tuned coils, tunable from the rear panel, let you optimize performance. High quality, low-drift silver mica capacitors maintain proper tuning. The low-loss Pi-network output tank of AL-811XCE amplifiers has been carefully designated for optimum Q on each band and built with quality RF components. The results are peak performance over each band, a wide impedance matching range, and exceptionally smooth tuning with efficiencies close to 70 percent. Even a 3:1 SWR load won't damage the tubes or tank components.

Features include:

* Operate/standby switch lets you run barefoot, but you can instantly switch to full power if needed
* Adapt-A-Volt power transformer compensates for stressful high and low line voltage
* Two illuminated cross-needle meters
* Transmit LED tells you when your rig is keying the amplifier
* Quiet blower keeps 811A tube temperature low without the noise of oversized fans
* 12 Vdc keying relay makes it compatible with solid-state and tube rigs
* Precise and easy plate tuning with a ball bearing Vernier reduction drive
* Built-in back-pulse canceling diode protects your rig's keying circuit
* Shielded RF compartment

Documentation

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