Tokyo Hy-Power RF Linear Amplifiers

Solid State RF Linear Amplifier Engineering  

1.8 MHz ~ 28 MHz (160m ~ 10m)
Detailed Views and Specifications
HL-2400 HF Amplifier

  • HF Amplifier built by THP for Japan Market

  • Uses Dual 8875 Tubes

  • Dual Meters reading IP, IG, EP and Power Out

  • Fan Delay Circuit will cool tubes even after power is switched off.

  • Drive 50 -80W

  • Wide Line Voltage Operating Range 100V-250V 50-60 Hz

  • Full ALC control

  • More Info Coming


The HL-2400 was designed for the Japanes ham market in the late 1990's.


The unique air cooling duct design incorporates an efficient powerful blower fan which supplies cooling to the Aluminum Block heat sink located atop the Power Amplifier module. The fan also supplies cooling to the other internal components of the amplifier. Its quiet operation allows for even the weakest signals to be heard.

The amplifier uses a sophisticated circuit containing an advanced 16 bit microprocessor to control the normal functions of the amplifier along with the various high speed protection circuits, which will protect the amplifier from faults such as Overdrive and High SWR.

There is a front mounted meter. The meter’s function is selectable via the front mounted meter switch. It can display Power Reflected (Pr), Power Forward (Pf), Idle voltage to the MosFets (Vd), and Transmitting Current of the MosFets (Id). Mount to the right of the meter switch is the manual rotary band switch which the operator would use to select the appropriate band. There are also numerous LED indicators mounted on the front panel, Power On, High Current (Id). Warning lights include Over Drive, Overheat, Over Volt, Internal Fuse Open, and Excessive Reflective Power.

Rear controls include ALC adjustment control, Transmitter input, Antenna output, PTT keying line (STBY) RCA jack and an ALC Input RCA jack.

The amplifier is QSK capable (50wpm+) using miniature high speed Panasonic relays for T/R switching.

Frequency Band 1.8MHz ~ 28MHz (160m ~ 10m)
(Including Most WARC bands)
Operating Modes SSB / CW / RTTY
Typical RF Drive
(full output)
SSB 50W typical — 80W Max
Output Power 1000W PEP Max SSB / 600W CW and RTTY Plus other digital modes
Amplifier Class Class AB2 Ground Grid
Tubes Two Eimac 8875
Band Switching Manual
Power Requirement 100VAC-240VAC
50/60Hz — 10A @ 240V
Cooling Method Fan Cooled
T/R Switching Unknown
Size 405W x 200H x 390D (mm)
Weight 30 Kgs
Manufactured 19xx - 20xx

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