PICTURES ARE OF ACTUAL AMPLIFIER  SERIAL NUMBER U4 17015

The OM Power model OM4000 HF is a manual tuning 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.

OM4000HF Manual link.

The OM4000HF linear amplifier is designed for all shortwave amateur bands from 1.8 to 29 MHz (including WARC – bands ) and all modes. It is equipped with two FU-728F ceramic tetrodes.

The advantages of the OM4000HF:

Specifications of the OM4000HF:

Frequency Coverage Amateur Bands 1.8 – 29.7 MHz including WARC

Power Output 1500W PEP continuous output – no time limit

Input Power Usually 50 to 70W for full Output Power

Input power can not exceed 100W !

Input Impedance 50 Ohm,

VSWR < 1.5 : 1

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 < -50 dBc

Tubes 2x FU728F Ceramic tetrode

Cooler Centrifugal blower + Axial blower

Power supply 240V – 60Hz

Transformers 2 pcs of toroidal transformer 3kVA

Dimensions 485x200x455mm (width x height x depth) (19”x8”x18”)

Weight 43 kg (94.8 lbs)
 

Protection circuits:            

 VSWR too high 

Input power too high 

Output power too high 

Plate voltage too low 

Anode current too high 

Screen current too high 

Grid current too high 

Mistuning of PA 

Hot switching protection 

Soft start for protecting your fuses 

“switch-on blocking “ at opened amplifier