Used RF Amplifiers
204 units in stock — broadband RF and microwave power amplifiers, led by Amplifier Research and ENI, plus general lab amplifiers from Agilent/Keysight and Krohn-Hite. Ships from Pleasant Grove, UT.
AE Techron / Crown RF Amplifiers (1 unit)
Agilent RF Amplifiers (1 unit)
Agilent / HP / Symmetricom RF Amplifiers (1 unit)
Agilent / Keysight RF Amplifiers (45 units)
Alpha Wireless RF Amplifiers (1 unit)
Ametek / Amplifier Research RF Amplifiers (1 unit)
Amplified Research RF Amplifiers (1 unit)
Amplifier Research RF Amplifiers (63 units)
Analog Devices RF Amplifiers (1 unit)
Applied Systems Engineering RF Amplifiers (1 unit)
Comlinear Corporation RF Amplifiers (1 unit)
Comtech PST RF Amplifiers (9 units)
Corry Micronics Inc RF Amplifiers (1 unit)
Cougar Components RF Amplifiers (7 units)
Crown RF Amplifiers (2 units)
ENI RF Amplifiers (18 units)
ElectroCraft RF Amplifiers (1 unit)
FLC Electronics RF Amplifiers (1 unit)
Federal Products Corp. RF Amplifiers (1 unit)
General Microwave RF Amplifiers (1 unit)
HP RF Amplifiers (1 unit)
HP / Agilent RF Amplifiers (5 units)
HP / Agilent / Keysight RF Amplifiers (1 unit)
Hewlett Packard RF Amplifiers (1 unit)
Intra Action RF Amplifiers (1 unit)
JCA Technology RF Amplifiers (2 units)
Kalmus RF Amplifiers (11 units)
Keysight / Agilent RF Amplifiers (7 units)
Keysight / Agilent / HP RF Amplifiers (1 unit)
Krohn-Hite RF Amplifiers (3 units)
L3Harris RF Amplifiers (2 units)
Labworks Inc. RF Amplifiers (1 unit)
Rohde & Schwarz RF Amplifiers (6 units)
Stanford Research RF Amplifiers (2 units)
Stanford Research Systems RF Amplifiers (2 units)
EMC Immunity Test Amplifiers
Amplifier Research is by far the largest brand in this category, alongside ENI — both built broadband, high-power RF and microwave amplifiers primarily for EMC immunity and susceptibility testing, driving an antenna to generate a specified field strength (V/m) at a device under test, per standards like IEC 61000-4-3. These need to deliver substantial power flat across a wide frequency range, which is what "broadband" means here: rated power maintained across a wide sweep, sometimes decades, rather than tuned to a narrow band.
General Lab RF Amplifiers
Many of the Agilent/Keysight and Krohn-Hite units in this category are smaller general-purpose lab amplifiers, boosting signal levels for test setups — driving a mixer, filter, or another instrument's input — rather than driving an antenna for field-strength testing. Kalmus and Comtech PST amplifiers span both use cases depending on the specific model and power level.
Building a Complete EMC Immunity Setup
A complete immunity test setup needs more than the amplifier alone: a signal generator to drive it, the amplifier itself, an antenna to radiate the amplified signal, a directional coupler and power meter to monitor forward and reflected power, and a field probe to verify actual field strength at the test location. The amplifier is one piece of a larger system — check our Signal Generators and RF Calibration Equipment categories for the rest.
What to Check Before Buying
Confirm the frequency range and rated output power actually cover your application — undersized power at your target frequency is the most common mismatch we see. For EMC-focused amplifiers specifically, ask whether the unit has been function-tested at or near rated power rather than just powered on; RF power amplifiers can develop output stage issues that only show up under real load, not on a quick power-on check.
Calibration for RF Amplifiers
Calibration on an RF power amplifier verifies gain flatness and output power accuracy across its rated frequency range against a traceable power reference. For EMC-application amplifiers, this is typically checked alongside the rest of the immunity test system rather than in isolation, since the actual field strength delivered depends on the whole signal chain. See all calibration services →
Frequently Asked Questions
What is the difference between Amplifier Research/ENI-style amplifiers and general lab RF amplifiers? +
Amplifier Research (the largest single brand in this category) and ENI built broadband, high-power RF and microwave amplifiers primarily for EMC immunity and susceptibility testing — driving an antenna to generate a specified field strength (V/m) at a device under test, per standards like IEC 61000-4-3. These need to deliver substantial power flat across a wide frequency range. Smaller general-purpose lab amplifiers (many of the Agilent/Keysight and Krohn-Hite units here) boost signal levels for test setups, driving a mixer, filter, or another instrument input rather than an antenna.
What does "broadband" mean for an RF power amplifier, and why does it matter? +
A broadband amplifier maintains its rated power and reasonably flat gain across a wide frequency range — sometimes decades, from a few hundred kHz up through several GHz on some models — rather than being tuned to a narrow band. This matters for EMC testing specifically, where standards require sweeping across a wide frequency range at a consistent field strength, which a narrowband amplifier simply can't do.
What else do I need besides the amplifier for EMC immunity testing? +
A complete immunity test setup needs a signal generator to drive the amplifier, the amplifier itself, an antenna to radiate the amplified signal, a directional coupler and power meter to monitor forward/reflected power, and a field probe to verify actual field strength at the test location. The amplifier is one piece of a larger system, not a standalone solution.
What should I check before buying a used RF power amplifier? +
Confirm the frequency range and rated output power actually cover your application — undersized power at your target frequency is the most common mismatch. For EMC-focused amplifiers specifically, ask whether the unit has been function-tested at or near rated power rather than just powered on, since RF power amplifiers can develop output stage issues that only show up under real load.
Need a specific frequency range or power level?
Tell us your test requirements, and we'll check our incoming stock.
Get in touch