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DC9DZ: Project Katana 5K – Power Amplifier (PA) using GU78b

Data of DRESSLER Katana-5K RF Linear Amplifier

Frequency bands all HF amateur bands 1.8 MHz to 29.7 MHz
Power supply 2 power supply transformers 4000 VA & 1.5 VA
Plate voltage 3450 V at full output power
Screen voltage 330 V stabilized
Grid voltage - 70 V +/- 10 V regulated
Filament 27 V / 3.7 A
Input SWR 160 m – 10 m < 1.15 : 1
Gain (1.8 – 29.7 MHz) 17.0 dB
Amplification Input power Output power  
Measured with a Bird Power Meter, Model 43, PEP. 10 W
20 W
30 W
40 W
50 W
60 W
70 W
80 W
90 W
  600 W
1200 W
1800 W
2400 W
3000 W
3600 W
4200 W
4800 W
5400 W
 
Input SSB Signal 20% of full 1.5 KHz Modulation
on / off Ratio 1:4, Interruptions: 30 Hz
Output limited by Software RTTY / CW / SSB:   1800 W / 3500 W / 5500 W
Harmonic Output 50 dB below rated output
IMD - 43 dB @ 25% power output
- 37 dB @ 50% power output
- 33 dB @ 100% power output
Tube Svetlana GU-78b
Input network 50 Ohm, 200 W HF Resistor,
5 pol. Chebychev Low Pass Filter
Output network Inductor: 20 uH, Caps: 250 pF var. + 390 pF fixed / 1000 pF var. + 1 nF fixed
Computer control Plate current (every 5 msec), SWR, all switching functions,
no relais switching under power conditions, soft start inrush, 240 sec delay time for full power, turbine blower with 2 speeds.

Well regulated screen and grid supply for +ve and -ve currents as well as current limiting to protect the tube and minimize the IMD. It is impossible to override the screen and grid dissipation at any working conditions.
Metering Output, SWR, Plate current, Plate voltage,
Screen & Grid current / voltage
Housing High quality black eloxial aluminia
Dimension 446w x 156.5h x 485d mm³
Weight 40 kg
Price 3998 €, optional SSB Tuning Aid 100 €
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