The ACOM 1000 HF Linear Amplifier is a highly valued amateur HF amplifier that offers a comfortable 1000-watt output on all amateur bands from 160 through 6 meters. It is designed to be easy to operate, with features such as the plate-load True Resistance Indicator (TRI) and automatically controlled input attenuation, which help the operator quickly and precisely match antennas. The amplifier also has an auto-operate function that saves manual operations and time.

One notable feature of the ACOM 1000 is that it does not require antenna tuners. It can perform the functions of an antenna tuner for VSWR up to 3:1, allowing for faster antenna changes and broader frequency range usage, thus saving tuning time.

The amplifier is user-friendly and designed to look after itself. It can safely withstand up to 300W reflected power, drive up to 100 milliseconds duration spikes, drive RF "tails" after a PTT or KEY release, and operator's inadvertent tuning errors. It can also function with a "soft" AC line and deliver more than half power at only 75% of the nominal mains voltage. Additionally, it can withstand voltage drops and line voltage spikes, making it suitable for field days and expeditions.

The ACOM 1000 features an LCD comment display with text messages, 12 parameters, and a strip peak-reading PEP meter. LED indicators are provided for OPERATE, attenuation-on, and ON/OFF conditions.

Maintenance is made easy with the amplifier's internal status signatures stored in non-volatile memory for the seven most recent auto-protection trips. This information is used for diagnostics.

The ACOM 1000 is virtually silent in QSK mode, thanks to the quiet input bypassing and vacuum antenna relays.

With its broadband input matching, the amplifier provides an excellent load to the transceiver over the entire spectrum of 1.8-54MHz.

The amplifier utilizes a single 4CX800A (GU74B) Svetlana high-performance ceramic-metal tetrode with forced air cooling and grid-driven operation.

Tube protection is a priority, and plate and grid voltages and currents, as well as the exhaust temperature, are permanently monitored and protected.

Regarding specifications, the ACOM 1000 covers all amateur bands from 1.8-54MHz. It offers a power output of 1000W PEP or continuous carrier, with no mode limit. It has excellent intermodulation distortion performance, better than 35dB below-rated output. The hum and noise level is better than 40dB below-rated output, and harmonic output suppression is impressive, with -1.8-29.7MHz better than 50dB below-rated output and -50-54MHz better than 66dB below-rated output.

The amplifier's input and output impedances are nominally 50 Ohm unbalanced, with UHF (SO239) type connectors. The input circuit is broadband, with a VSWR of less than 1.3:1 from 1.8-54MHz continuously, and the bypass path has a VSWR of less than 1.1:1 from 1.8-54MHz continuously. The output matching capability is better than VSWR 3:1 or more and is excellent at reduced output levels.

The RF gain of the amplifier is typically 12.5dB, with a frequency response of less than 1 dB. It requires 50 to 60W drive power for rated output. The primary power input is 170-264V, with taps for different nominal voltages and options for 100, 110, and 120V upon request. The amplifier complies with CE safety and EMC requirements and FCC regulations for the 6, 10, and 12m bands. In terms of size and weight, it measures 422x355x182mm (16.6x14x7.2 inches) and weighs 22kg (48.5 lbs) when operating.

The ACOM 1000 is designed to operate in temperatures ranging from 0 to +50 degrees Celsius, with humidity up to 75% at +35 degrees Celsius. It can be used at heights up to 3000m above sea level without output deterioration.