Hardrock-50 Amplifier Information Site

Welcome to the Hardrock-50 power amplifier site!

Announcing the retirement of the Hardrock-50 kit. The Hardrock-50 is now only available fully assembled and tested, ready to connect to your QRP radio!

The Hardrock-50 is a complete 5W in, 50W out power amplifier kit. The HR50 is FCC Type Approved for commercial sale and can be purchased at RFPowerTools.com. The HR50 uses 4 Mitsubishi RF16HHF1 power MOSFETs and microprocessor controlled for easy reliable operation. The amplifier is based on Jim Veatch's award winning design developed for the ARRL's 2nd Homebrew Challenge competition and was tested extensively by the ARRL labs for output power, linearity and durability. More than 2500 kits have been sold. . 

The HR50 interfaces with popular QRP transceivers like the Elecraft KX2/KX3, Yaesu FT-817, ICOM IC705 and Flexradio Flex-1500 to provide additional power when necessary or to act as an intermediate amplifier for driving even higher power amps. The HR50 can be fitted with a wide range ATU that fits inside the case and integrates seamlessly with  HR50's operation allowing it to work with just about any antenna. 

Have a look at the reviews on Eham.net (opens in a new window).