U14813 Used Ameritron AL-811 Amplifier

This Ameritron AL-811 is in great used condition. It has a few light scratches, but no major cosmetic issues at all. This unit is very clean. Everything is very well kept and this unit is in great shape overall. Amp powers up and works as expected. It has very little use from the previous owner. Comes with manual and original box.

This amp was purchased new in Feb 2024. It has full output

Purchase is covered under our 30 day warranty.

Additional Product Details:

Ameritron AL-811 Linear Amplifier - a quiet desktop model that is so compact, it will slide right into your station, and you'll hardly know it is there until QRM sets in. The AL-811 amplifier 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 it worth the 3 or 4 times more money it'll cost you? The Ameritron AL-811 amp gives you a powerful punch at a price that's easy on your wallet.

AL-811 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-811 amplifiers are manufactured with three tough 811A transmitting tubes. Ameritron AL-811 amplifiers are excellent for the newcomer because they're tough enough to withstand momentary mis-tuning. Plus, the tubes are relatively inexpensive to replace.

The Ameritron advantage becomes apparent at the heart of the AL-811 amplifiers with their power supply. 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-811 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-811 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.

Ameritron AL-811 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 AL-811 amplifiers

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

SN: 20854

Item comes with our 30 day in-store warranty.