AMPTEC LA4000 HF Power Amplifier, designed for use on all short wave amateur bands from 1.8 to 29.7 MHz , including WARC bands and all modes.
It is equipped with a two pieces of ceramic tetrode FU728F.
Frequency coverage:
Amateur Bands 1.8 – 29.7 MHz including WARC
Power output:
4000W in SSB and CW, 3000W in RTTY, AM and FM
Input Power: Usually 60 to 90W for full Output
Power Input Impedance: 50 Ohm, VSWR less than 1.5 : 1
Power Gain: 17 dB
Output Impedance: 50 Ohm unbalanced
Maximum Output SWR: 2:1 SWR protection:
Automatic switching to STBY, when reflected Power is 350W or higher
Intermodulation distortion: 32dB below nominal output
Suppression of harmonics: less than -50 dBc
Tubes: 2x FU728F Ceramic tetrode Cooler:
Centrifugal blower + Axial blower
Transformers: 2 pcs of toroidal transformer 3kVA
Width * Height * Depth
Weight: 54 kg
shipping weight about 69kg
Protection circuits: - VSWR too high - Input power too high - Anode current too high - Grid current too high