THE MAX limit of power is always 400Watt in the Netherlands.

There is no amplifier that hold 400watt max. You have to build it yourself. Even then filtering will be worse.
Is just as driving a car to the limit. It will collapse after a while. So you need a bit overkill to save your equipment.

** note ** Pictures are from the internet.!! not provided by myself. I’m not responsible if anything is read in a wrong way.

Here you can see the line of the Alpha Amplifiers.. Photo’s taken from the inside and outside. It’s one of the best Amp’s ever made.

First a few photo’s and details about the Alpha linear click on the front photo to view the details about the amp!!


  • Capable of 1.5kW continuous RF ouput on all commonly used modes and on any authorized amateur frequency from 1.8 to 29.7 MHz with no time limit
  • Full CW Break-In (QSK) and all digital modes
  • Compatibility with popular amateur transceivers and exciters
  • AlphaMax firmware comes with added features to readjust output network, trim tune, and readjust loading to prevent distortion due to overdrive.


Here a few photo’s of the inside from an Alpha87a Link

elco fan spoel tubes


Band Change & Tuning: matic under microprocessor control; average time required for complete bandchange and tuneup, <1 second. No special cables or connections required.
Frequency Coverage: All amateur bands 1.8-29.7 mhz* plus most non-amateur frequencies 6.0-19.0 mhz and 20-30 MHz.
Power Output: 1500 watts pep, keyed cw, or continuous carrier, no time limit. Auxiliary cooling fan (optional) recommended for very high duty cycle continuous operation i.e. contesting & RTTY.
Drive Power: Typically 50 to 55 watts for full rated output.
Input VSWR: < 1.5:1 within amateur bands; < 2:1 elsewhere.
Tube Complement: Two Eimac 3CX800A7 triodes in grounded grid.
T/R System: Heavy duty PIN diode switch capable of feedthrough and hot switching of 150W exciter power. Switching time approximately 1ms. Enclosed mechanical bypass relay.
ALC: Grid-current-derived, -10v maximum, adjustable gain.
Harmonic Output: Better than 50 db below rated output.
Intermodulation: Better than 35 db below rated output.
Fault Protection: Plate current, grid current, load VSWR, T/R sequencing, gain (i.e., severe mistune or RF arc), overdrive, open heater, overtemperature, others.
Displays: Led bargraphs for peak pout, prefl and switched bargraph for ip, hv and tune indicator.
Cooling: Full cabinet ducted air, rear intake/top exhaust. Floating blower mount for quietest operation.
Primary Power: 190-250V (200, 220, 240V nominal taps), 50-60 Hz, single phase; fused 20A.
Size & Weight: 17.3″ W x 7″H x 16.5″ D (439 x 178 x 419 mm) excluding controls, feet, and connectors. 75 lb. (34kg) net.