====== Titan Model 425 Linear Amplifier ======
{{425.jpg?150|}}{{:425rear.jpg?150|}}{{:425ps.jpg?100|}}


===== Reviews =====
  *[[http://www.arrl.org/members-only/prodrev/pdf/pr8604.pdf|ARRL]] (Must be an ARRL member and logged in to view.)
  *[[http://www.eham.net/reviews/detail/669|eHam]]
  *CQ Magazine, 1986, February, Pg 34


===== Mods & Info =====
  *[[425versions|Titan 425 Duty Cycle and Version Description]]
  *[[425schem-k9yc|Titan 425 Partial Schematic]]

===== Brochure =====
{{425brochure.jpg?150|}}

===== Specifications =====
  ***Band Coverage:** 1.8 - 2.0, 3.2 - 4.7, 6.5 - 8.5, 13.4 - 19.6, 17.6 - 23.0 MHz, With 10 meter modification, 17.6 - 26.5, 20.6 - 31 MHz.
  ***Drive Power:** 65 to 80 watts typical for 1500 watts output.
  ***Efficiency:** 50 - 65%, depending on frequency, drive level, and load.
  ***Distortion:** -35 dB from 1 KW RF output level.
  ***Harmonics:** -50 dB typical.
  ***Input/Output Impedances:** 50 Ohms.
  ***CW Break-in:** QSK with vacuum relay.  RF sensing circuit prevents keying or un-keying if 10 mW of RF present on the RF drive line.  Switching time less than 8 ms.
  ***Tube Complement:** Two Eimac 3CX800A7 ceramic, external anode triodes in a grounded grid circuit.  Plate dissipation, 1600 watts.
  ***Plate Voltage:** HI = 2400 Vdc, LO = 1800 Vdc, no load.
  ***Cooling:** Ducted forced air, vertical exhaust, using a two speed centrifugal blower.
  ***Metering:** Full time plate current.  Switch selected plate voltage, grid current, forward power or reflected power.  Peak power is indicated on a 10 element LED bargraph display.  The first nine elements are amber - the tenth LED is red and indicates 1500 watts output.
  ***ALC:** Negative-going, adjustable threshold.
  ***LED Status Indicators:** Overdrive, Standby, Wait, Operate..
  ***Primary Power:** 220 - 250 VAC @ 20 A, maximum. 117 Vac operation possible but not recommended.
  ***Protection:** Primary line fuses, plate current fuse, ac line and high voltage interlocks.
  ***Front Panel Controls:** Power ON-OFF; Mode (Standby-Operate); plate voltage select (HI-LO); Plate TUNE; Loading; BAND Switch; METER Switch.

== Size and Weight ==
  ***Amplifier:** HWD 5.25" x 15.25" x 15"
  ***Power Supply:** HWD 8.25" x 13.4" x 10.25"
  ***Amplifier:** 17 lbs
  ***Power Supply:** 45 lbs