====== Hercules II Model 420 ======
{{420.jpg?150|}}{{420rear.jpg?135|}}

===== Description =====
Solid state all mode 550 watt no-tune amplifier.

===== Reviews =====
  *[[http://www.eham.net/reviews/detail/111|eHam]]
  *CQ Magazine, 1990, August, Page 22

===== Related Links =====
  *[[this>./webarchive/420/|Archived Ten-Tec Web Page]]

===== Specifications =====
  ***Operating Frequency Range:** General coverage 1.6 to 22.000 MHz. Modification for 22.000 to 30.000 MHz is available for authorized users.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 ohms 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".

  ***Weight:** 15 lbs.

===== Accessories =====
  *Model [[9420]] Power Supply (sold separately from amp)
  *Model [[9423]] Remote Control Head
  *Model [[9422]] DC Cable
  *Model [[264]] "Y" Cable
  *Model [[236]] "Y" Cable