====== Centurion Model 422 Linear Amplifier ======
{{422.jpg?180|}} {{422rear.jpg?150|}}

===== Description =====
QSK amplifier using 3-500Z tubes. The RF deck and power supply are combined into a single desk top cabinet. The power output is rated at 1300 watts on ssb, 1000 watts cw and 650 watts using “key- down” modes. Drive required for full power ssb operation is 100 watts. The duty cycle is 50%.

===== Reviews =====
  *[[http://www.arrl.org/members-only/prodrev/pdf/pr9207.pdf|ARRL]] (Must be an ARRL member and logged in to view.)
  *[[http://www.eham.net/reviews/detail/113|eHam]]
  *[[http://www.hamradiomarket.com/Articles/Ten%20Tec%20Centurion.htm|Bob Hutchinson, N5CNN]]

===== Mods, Fixes and Additional Info =====
  * Meter lamp replacement: NAPA auto parts CM 756, 14V 80ma
  * [[422plate|non-zero plate current at idle]]

===== Related Links =====
  *[[this>./webarchive/422|Archived Ten-Tec Web Page]]


===== Brochure =====
{{422brochure.jpg?150|}}

===== Specifications =====
  ***Band Coverage:** 1.8 - 2.0, 3.2 - 4.7, 6.5 - 10.3, 13.4 - 19.6, 17.6 - 21.5 MHz, 21.5 - 29.7 MHz after authorized modification.

  ***Input Power:** 2000 watts, maximum.

  ***Power Output:** 1300 watts SSB, 1000 watts CW, RTTY and SSTV 650 watts, 50% duty cycle.

  ***Drive Power:** 100 watts for full rated output.

  ***Efficiency:** 50 - 65%, depending on frequency and load impedance.

  ***Input/Output Impedances:** 50 Ohms, unbalanced, SWR < 2:1.

  ***Distortion:** -35 dB from 1 kw RF output level.

  ***Harmonics:** -50 dB typical.

  ***CW Break-in:** QSK capable, Relay switching.

  ***Tube Complement:** Two Eimac 3-500Z.

  ***Power Amplifier Circuit:** Class AB2, grounded grid.

  ***Plate Voltage:** 3100 volts, no load.  2600 volts, full load.

  ***Cooling:** Forced air with full chassis air flow.

  ***Metering:** Dedicated plate current meter.  Selectable multi-meter for plate voltage, grid current, forward or reflected power.  Ten element LED bargraph display for peak power indication.

  ***Front Panel Status Indicators:** Standby, operator, transmit.

  ***Primary Power:** 220 - 250 VAC @ 15 A, 110 - 125 VAC @ 30 A, 50/60 Hz.  For full power operation, 220 - 250 VAC strongly recommended.

  ***Circuit Protection:** Primary line fuses.  Plate transformer primary interlock and high voltage shorting bar.

  ***Front Panel Controls:** Power on/off, standby/operate, control mode select (QSK - PTT/VOX), plate TUNE and LOAD, band switch, meter switch.

  ***Tune and Load Controls:** 6:1 vernier drives with calibrated dial skirts.

  ***Construction:** Aluminum chassis, front and rear panels, interior partitions and top and bottom covers.

  ***Size:** HWD 8.25" x 15.25" x 18.5" (20.3 x 38.7 x 46.9 cm)

  ***Weight:** 47 lbs (21.3 kg)

Note for older 422 Centurion amp owners: Using an older Centurion with the newest Ten-Tec HF transceivers - Pegasus, Jupiter, and Orion - may require a small modification to the QSK board in older Centurion amps for proper QSK CW keying. Short diode D2 (red diode, 1N4148, next to Q1) with a jumper wire. The current 422B does not require this modification. For questions, please consult our service department at (865) 428-0364 or via email at service@tentec.com