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DC9DZ: Project Katana 12K 3PHS – Power Amplifier (PA) using two GU78b

Data of DRESSLER Katana-12K3 RF Linear Amplifier

Frequency bands all HF amateur bands 1.5 MHz to 29.7 MHz
Power supply 3 power supply transformers 4600 VA (3PHS), 800 VA (1PHS) & 1.5 VA
Plate voltage 3750 V at full output power
Screen voltage 330 V stabilized
Grid voltage - 69 V +/- 10 V regulated
Filament 27 V / 7.5 A
Input SWR 160
17
m – 15 m
m – 10 m
< 1.35 : 1
< 1.50 : 1
Gain (1.5 – 29.7 MHz) 20.0 dB
Amplification Input power Output power  
Measured with a Bird Power Meter, Model KH1, PEP 10 W
20 W
30 W
40 W
50 W
60 W
70 W
80 W
90 W
100 W
110 W
120 W
  1000 W
2000 W
3000 W
4000 W
5000 W
6000 W
7000 W
8000 W
9000 W
10000 W
11000 W
12000 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:   3000 W / 6500 W / 13000 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 Two Svetlana GU-78b
Input network 50 Ohm, 200 W HF Resistor,
5 pol. Chebychev Low Pass Filter, switched in 2 domains
Output network Roller inductor: 24 uH, Caps: 250 pF var. + 390 pF fixed / 4.5 KV & 1000 pF var. / 2 KV
Computer control Function parameters every 5 msec, SWR, all switching functions,
no relais switching under power conditions, soft start inrush, 240 sec delay time for full power, 2 speed turbine blower

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, 12 V, 24 V
Housing High quality black eloxial aluminia
Dimension 548w x 159.5h x 560d mm³
Weight 71 kg
Price 10980 €
optional SSB Tuning Aid 120 €
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