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Date Posted by Category User IP

2012-02-11 (UTC)

KT6E

HF Amplifiers

Tentec Hercules II 420

Solid state HF amplifier. 15 - 160M. 70W in, 550W out. Requires 13.6VDC @ 80A. Requires mod for 10M. Analog meter frozen, otherwise, excellent condition electrically and cosmetically. Manual and power cables included. $850 shipped CONUS.
TenTec Hercules II model 420 SPECIFICATIONS:
Operating Frequency Range: General coverage 1.6 to 22.000 MHz. Coverage is in seven bands which are front panel or rear panel remote selectable.
RF Power: 1000 watts input. 500/600 watts output, depending on frequency and load impedance.
Drive Power: 65 to 80 watts typical for 500 watts output.
Distortion: -35 dB from 500 watt output level.
Harmonics: -50 dB typical.
Input and Output Impedance: 50 0hms unbalanced, < 2:1 SWR
Cooling: Internal forced air, rear panel exhaust.
Metering: Switch selectable forward power, SWR, Icc (collector current) and Vcc (Voltage). Ten element LED bar graph displays peak output power.
Primary Power: RF deck, 12 to 14 volts at 100 amps, maximum.
TX/RX Switching Time: 10 ms or less.
Duty Cycle: 100% typical Amateur service. 10 minutes maximum continuous key-down at 500 watts output.
Final Amplifier Transistors.' Eight MRF458, or equivalent.
Protective Circuits: Over-voltage and overcurrent lockout. Front panel "OVERDRIVE" light.
Front Panel Controls: Multi-meter control switch. power on-off switch and band select switch.
Rear Panel Connections: RF in, RF out, DC input. TX/RX control jacks and remote control socket.
Size: HWD 5.25" x 12" x 14.5
Photos available

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