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DC9DZ: Project Aladin – Power Amplifier (PA) using GU74b

Data of DRESSLER Aladin RF Linear Amplifier

Frequency bands all HF amateur bands 1.8 MHz to 29.7 MHz
Power supply 2 power supply transformers 1600 VA & 1.5 VA
Plate voltage 2850 V at full output power
Screen voltage 330 V stabilized
Grid voltage - 49 V +/- 10 V regulated
Filament 12.6 V / 3.7 A
Input SWR 160 m – 10 m < 1.15 : 1
Gain (1.8 – 29.7 MHz) 12.0 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
  170 W
340 W
510 W
680 W
850 W
1020 W
1180 W
1350 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:   800 W / 1000 W / 1400 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-74b
Input network 50 Ohm, 100 W HF Resistor,
5 pol. Chebychev Low Pass Filter
Output network Inductor: 24 uH, Caps: 250 pF var. + 220 pF fixed / 5 KV & 1000 pF var. + 2 nF fixed / 5 KV
Computer control All switching functions, no relais switching under power conditions, soft start inrush, 150 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, Plate current, Plate voltage – no switching
Housing High quality black eloxial aluminia
Dimension 476w x 128h x 365d mm³
Weight 20 kg
Price 2195 €, optional SSB Tuning Aid 120 €
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