ARRL

HF Tube Amplifiers

Introduction

Tube amplifiers are a popular project among hams.  Many hams like the challenging of hunting for parts to build a high quality amplifier out of inexpensive surplus parts.  Keep in mind that the before 1982, the FCC regulated hams according to input power, so when hams talk about a 1kW amplifier, they are referring to 1kW input, not output.  Few of the older amplifiers will handle the modern legal limit of 1.5kW.

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