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DC9DZ: Project 6-Pack – Power Amplifier (PA) using six GU50

Data of DRESSLER 6-Pack RF Linear Amplifier

Frequency bands all HF amateur bands 1.8 MHz to 29.7 MHz
Power supply 2 power supply transformers 900 VA & 1.5 VA
Plate voltage 1200 V at full output power
Screen voltage 225 V stabilized
Grid voltage - 47 V +/- 10 V regulated
Filament 12.5 V / 5 A
Input SWR 160m – 10 m < 1.04 : 1
Gain (1.8 – 29.7 MHz) 11 dB
Amplification with 80 W SSB input Frequency Output power  
Measured with a Bird Power Meter, Model 43, PEP 1.9 MHz
3.5 MHz
7.0 MHz
10 MHz
14 MHz
18 MHz
21 MHz
24 MHz
29 MHz
  820 W
900 W
900 W
900 W
900 W
860 W
850 W
820 W
800 W
 
Input SSB Signal 25% of full 1.5 KHz Modulation
on / off Ratio 1:3, Interruptions: 30 Hz
Output limited by Software RTTY / CW / SSB:   500 W / 750 W / 1000 W
Harmonic Output 50 dB below rated output
IMD 32 dB or better
Tubes Six GU-50
Input network 50 Ohm, 200 W HF Resistor,
5 pol. Chebychev Low Pass Filter
Output network Inductor: 16 uH, Caps: 250 pF var. + 440 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, 30 sec delay time for full power, 2 speed 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, Reflected Power, SWR, Plate current, Plate voltage,
Screen & Grid current / voltage
Housing High quality black eloxial aluminia
Dimension 476w x 133h x 365d mm³
Weight 16 kg
Price 1398 €, optional SSB Tuning Aid 120 €
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