Tokyo Hy-Power RF Linear Amplifiers

Solid State RF Linear Amplifier Engineering  

3.3 MHz ~ 28 MHz HF AMPLIFIER (80m~10m)
Detailed Views and Specifications
HL-450B HF Amplifier

  • Can be used both as a base and mobile unit

  • Compact and light weight package

  • Large front mounted, easy to read, power output meter (continuous mode)

  • Microprocessor controlled

  • Remote operation capable with the external controller – HRC-60

  • Fully automatic band selection with no additional cables

  • Automatic fault protection

  • ALC protection circuit to insure long life of the finals


The HL-450B is a 13.8V powered amplifier which makes it ideal for mobile use. The unit incorporates a newly developed microprocessor which controls all functions of the amplifier including automatic band switching, when driven by the transceiver. There is no need for a separate band data cable, for the amplifier automatically reads the radio’s frequency and selects the proper band. In addition to the automatic band select function, the band selection can be manually switched via the front panel controls or the optional external remote controller (HRC-60). This controller simply plugs into the rear of the unit.

The HL-450B can be keyed with RF or the recommended method of connecting a keying line to the rear jack of the unit. This hard keying circuit guarantees smooth and effortless T/R switching with the radio. Also incorporated, is an ALC circuit, which will help insure that the finals are always protected from being overdriven. Failure in not connecting the ALC, can result in premature failure of the finals and/or signal distortion.

An efficient fan which is mounted on the right side of the case supplies cooling air to the heat sink and the internal components of the unit.

The amplifier incorporates various protection circuits such as high SWR, Over Drive, Over Current, etc. Any fault encountered by the unit, will cause an immediate shut down of the amplifier protecting sensitive components.

There is a front mounted panel meter which displays output power (continuous mode), a power switch, and a manual/automatic mode switch for band switching. The front LED's indicate power on, auto/manual band select, fault indicator (PROT), On Air, and a row of 5 LED’s to indicate which band is selected.

The rear connections include, DC Power connection terminals, ALC Adjustment knob and ALC input jack, Keying Line jack (STBY), transmitter input and antenna output coaxial connections, and a 8 pin DIN socket for connecting the optional External remote controller.

The HP-450 matching power supply is available, which supplies the required 13.8VDC – 60 amps
HL-450B HF Amplifier
Click to enlarge:
Front | Rear | Main Board | Left Side | LFP Board

Frequency Band 3.5MHz ~ 28MHz
(80m ~ 10m and WARC)
Operating Modes SSB / CW / FM
Typical RF Drive
(full output)
50W typical
Output Power 350W Typical
300W Minimum all modes
400W SSB PEP Maximum
Amplifier Class Class AB Push – Pull Circuit
RF Power Transistors THP-120 x 4
Band Switching Manual
Power Requirement 13.6v - 60 Amps
Cooling Method Forced Air Cooling
T/R Switching Miniature High Speed Relays 5-6 ms
Size 8.7”W x 3.5”H x 13”D
Weight 11 lbs

Open PDF File Manual

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