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

Data of DRESSLER Katana-12K RF Linear Amplifier

Frequency bands	all HF amateur bands		1.8 MHz to 29.7 MHz
Power supply	2 power supply transformers		7000 VA & 1.5 VA
Plate voltage	3450	V	at full output power
Screen voltage	330	V	stabilized
Grid voltage	- 70	V +/- 12 V	regulated
Filament	27	V / 7.4 A
Input SWR	160 15	m – 17 m m – 10 m	< 1.35 : 1 < 1.50 : 1
Gain	(1.8 – 29.7 MHz)		20.0 dB
Amplification	Input power	Output power
Measured with a Bird Power Meter, Model 43, PEP, on a single 230 V line with 16 A fuse.	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	10% of full 1.5 KHz Modulation on / off Ratio 1:9, Interruptions: 30 Hz
Output limited by Software	RTTY / CW / SSB: 2800 W / 6000 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
Output network	Inductor: 15 uH, Caps: 250 pF var. + 400 pF fixed / 1000 pF var. + 330 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, 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
Housing	High quality black eloxial aluminia
Dimension	548w x 159.5h x 512d mm³
Weight	54 kg
Price	230 V line with CEE 1-32 (32 A): 9480 € optional SSB Tuning Aid 120 €

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