Alpha 8410 – manual tune

Alpha 8410 Manual Tune Full Legal Limit Linear Amplifier

  • Alpha 8410 Manual Tune Full Legal Limit Linear Amplifier

Our long line of manual tune amplifiers demonstrates a 40 year commitment to building the best amplifiers in the world. The Alpha 8410 continues that commitment as the rugged, forgiving, manual tune amplifier today. Price: $5,895.00


Price: $5,990.00 with optional rear fan, recommended for AM or RTTY use. bnbutton

email for production and shipping schedule.

Key Features

  • Legal limit plus headroom manual tune amplifier
  • Alpha’s low-drive, tube amplifier design delivers the cleanest possible signal
  • Operates on all Amateur Radio Bands 160M thru 10M
  • Twin 4CX1500B Tetrodes in parallel for a maximum plate dissipation of 3kW
  • Alpha’s Legendary service and support
  • 4 year limited warranty on hardware, 1 year on tube
  • 1500W, 100% duty cycle, no time limitation, key down forever
  • Rugged construction built to last
  • Designed, built, and serviced in the USA
  • Protection against all common faults

It’s the Ultimate Manual Tune Amplifier

If you re a contester, you have a favorite band you operate on, or you like the flexibility that comes with a powerful, manual tune amplifier, the Alpha 8410 amplifier is the one for you.

Built Rock Solid, from the Chassis Up

Just like our flagship 9500, we start with a .080 , 5052 grade, iridite yellow chromate coated, aluminum chassis that resists both flex and corrosion. To it, we bolt the front panel assembly and a center partition, building a solid I beam structure that just doesn’t move .

Add our custom made, time proven, Transformer that weighs a massive 35 lb and is capable of delivering 3,500VA of power to the plate of the Alpha 8410 tubes. Input Power mains taps are easily selected for 100, 120, 200, 220, 240 VAC, and the transformer was designed to operate at 50Hz or 60Hz.

Big Robust RF Deck and Tank P- L Network

The Alpha 8410 utilizes an enhanced version of the RF deck found in the Alpha 99, but instead of the 2 x 4CX800’s that have been increasingly difficult to find, our engineers chose Two reasonably priced 4CX1500Bs. These tubes are delivered to our distributor in massive quantity and have been chosen for applications world wide, which should guarantee a reasonably priced supply of these tubes for years to come.

A big, easy to grab knob is coupled to a hand balanced, heavy duty, four gang, commercially rated, ceramic switch assembly, so smooth, easy operation is guaranteed. The wafers are connected to the famous, heavy duty, silver plated, hand made, Alpha Pi-L matching network the Alpha 8410 will operate into up to a 3:1 SWR without the need for an external antenna tuner. Add the carefully chosen, massive, Tune and Load capacitors both conservatively rated so they will give years of smooth performance, and you’ve got what it takes to switch bands, tune and load this amplifier easily and accurately.

On the 8410’s control board you ll find a microprocessor that allows us to normalize amplification performance, calibrate the power and gain metering for each specific band, and increase reliability and durability. All of these functions aggregate into a single greater benefit for the user, ease of tuning. The 8410 comes standard with a USB port for remote monitoring and performance data logging.

Simple Installation

Besides the power Mains connection, there are only two required inputs to the Alpha 8410 the amp key line from the radio KEY IN , and the RF IN. All RF connectors on the Alpha 8410 are standard SO 239. No need for ALC input like lesser amplifiers. The micro computing platform assures you don’t damage the tubes by overdriving them. Two Separate input match circuits (tuned for 1.8-21 MHz and another for 24-29 MHz) guarantees a proper match with any standard 50 ohm output from your transceiver.

Proudly Handcrafted in the USA

This amplifier is as rugged and reliable as anything we’ve created. We buy the best components available for the Alpha 8410. Our stringent selection of even the simplest components demonstrates the commitment that we have to deliver the best, most reliable amplifier in the world.

The Alpha 8410 is finely handcrafted and is designed and built in Longmont, Colorado, USA, comes with an industry leading 4 year warranty on the amplifier, and 1 year warranty on the tubes, and is supported by our friendly and knowledgeable staff. We build them by hand, tune them by hand, and burn them in overnight at full power so we know that when you get your Alpha 8410, you ll have an amplifier that is the most rugged, best built in the world. It’s shipped double boxed, with the transformer packed separately so there’s little chance of anything happening to it on its way from the factory to its new operating position in your shack.


  • Frequency coverage: All amateur frequencies from 1.8 – 29.7 MHz
  • Power output: 1500 Watts minimum on all served bands
  • 3rd Order IM: <-30 dBc SWR tolerance 3:1
  • Drive power: 50 to 55 Watts nominal for full power out
  • Tube: Two 4CX1500B high performance power tetrodes with a combined plate dissipation of 3000 watts provides key down performance on all frequency bands, all modes, and all duty cycles
  • Cooling: Forced air
  • RF Input connector: comes with a standard SO 239 connector, but we can install N Type connectors if you specify at time of order.
  • RF/Antenna output: comes with a standard SO 239 connector, but we can install N Type connectors if you specify at time of order
  • Calibrated Wattmeter: The Bruene type wattmeter accurately simultaneously measures both forward and reverse power and displays this information on the easy to read bar graph meters on the front panel. It also uses the information to simultaneously monitor the gain of the amplifier.
  • Protection Mechanisms: HV Interlock and Power Interlock.
  • Tuning: Band switching Manual
  • Power: 100,120,200,220,240 VAC, 50 60 Hz, manual selection. At 240 VAC requires 20 Amps. Power cord is 8 feet long.  Note – Although the amplifier will operate at 100VAC, the Mains will have to be able to deliver upwards of 35 amps.
  • Interface: USB. Full remote control capability.
  • Protection: Protected against all common faults Reflected Power, excess Plate Current, Low Gain
  • Display: Bar graphs display RF Output Power, Reflected Power, and Plate Current, Plate Voltage, or Gain all simultaneously.
  • T/R switching: Two high speed relays enabling QSK (full break-in) at QRO (full power).  KEY IN jack 12 vdc / 10 ma.
  • Bypass capability: 500 Watts
  • Shipping Weight: 90 lb, Assembled weight 76 lb
  • Product Size: 17.5″ w x 7.5″ h x 19.75″ d
  • Standard Shipping Packaging: We ship the amplifier in a double box, and the transformer in a separate box.

Optional External (Rear)   Muffin Fan

Keying Cable for Kenwood radios – available, go to web store to order !

Keying Cable for Yaesu radios – available, go to web store to order !

Keying Cable for Elecraft, Flexradio, Icom, Ten Tec and Yaesu FTdx-3000 radios – available, go to web store to order !


Alpha 8410 User Manual, Latest Version 1.1 (August 2015) 8410_R1.1_080615_manual
Alpha 8410 User Manual (2009) 8410_MANUAL
AE9K 8410 Monitor Program Installation and Firmware Loading Instructions 8410_Monitor_by_AE9K
Alpha 8410 Firmware Loading Instructions 8410_Firmware_Loading_Instructions
Alpha 8410 Firmware v2.03k (latest version) MC_V2_03k
Alpha 8410 Firmware Errata Errata_8410_Firmware
Alpha 8410 Schematics 8410_SCHEMATICS
Alpha 8410 / 8406 Board Level Parts Lists 8410_8406_PCB_BOM
Alpha 8410 Chassis (Top Level) Parts List 8410_Parts_List
Amplifier Keying Specs (RELAY or KEY IN jack) Amp_Keying_Specs
USB / Serial COM port (FTDI) drivers CDM21216_Setup_1
Alpha Colt Boot Loader Alpha_Colt_Bootloader_1_1
Alpha 8410 Commands & Returns 8410_Commands_and_Strings


5 Replies to “Alpha 8410 – manual tune”

  1. Bob Lanning

    Glad to see the USA made line of Alpha amplifiers and other products are still available. Thanks for rescuing a super product line!

    The well designed amplifier with robust components out runs and performs the ACOM’s of this world.

    Bob – W6OPO
    Alpha owner

  2. Jason Burnside AD5TJ

    I ordered my Alpha 8410 just a few days ago. I installed the transformer and attached the cables, plugged it in. I am amazed at just how fine this amplifier is. Smooth tuning GREAT design and hardware. I am so glad I went with Alpha. So here is the deal, I am into rag chew operations (SSB) on the lower HF bands, mostly 80 and 40 meters, If i run across a special event station or DX I will snag it. I get legal limit with about 27 watts of drive power, no kidding, it only takes that much. I cant say enough good things about this amp. If you are looking for a legal limit amp this is the way to go. Alpha shipped this amp quickly and it was very well protected, double boxed with a bit of simi-rigid foam that gives a protected space between the boxes. It is easy to tune, silent keying, i cant hear it key at all, I am used to my Heathkit SB220 that goes THUNK when you key. This amp is beautiful and when you look inside you will see they use the best parts and the thing just works perfectly. You really do get what you pay for. Get one for yourself and see, you will not be disappointed in any way. Alpha, you have done such a great job! the customer service is better than any company i have ever dealt with. Again, I am so glad I went with Alpha. Thank you for all that you do. Now I can get on the air tune up and go……no sweat no strain, and I am also very glad to do business with a US company. If you want the best, go with alpha. Email me if you wish I will be glad to answer any questions about the 8410. if you want to hear it catch me on the lower HF bands in the evening….73

  3. Ed Luteran

    Been using my Alpha 8410 since purchased new in 2012. This amp has been extremely reliable. American-made quality shows in performance! Thanks for continuing the Alpha line of amps.

    73, de KL7HRN

    • Mike W2LO

      I have an Alpha 91b that’s about 22 years old and TWO 8410s. All of them get on-the-air exercise and they all work perfectly, reliably cranking out lots of RF year after year. All tubes are original. Easy to operate and forgiving of operator error (wrong band, etc.), they just keep working.
      As I’ve said before to others, I wish the consumer junk I buy were one tenth as good as my Alphas.
      Great equipment!


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