Yaesu FL-2100 Series HF Linear Amplifiers
Find resources for operating, modifying, and repairing Yaesu FL-2100, FL-2100B, and FL-2100Z HF linear amplifiers.
The Yaesu FL-2100 series of HF linear amplifiers has been a workhorse for many amateur radio operators for decades. These amplifiers, typically using a pair of 572B triode tubes, provide a significant power boost for stations operating on the HF bands, helping hams achieve stronger signals for DX contacts and contest operations. Even though these amplifiers are no longer manufactured, they remain popular due to their robust design and repairability.
Operators often seek out resources for maintaining and improving their FL-2100 series amplifiers. This includes detailed repair guides for common issues, modifications to add bands like 12 meters, and operational tips to ensure the tubes perform optimally. Many hams share schematics and restoration projects for models like the FL-2100Z and FL-2100B, helping others keep these classic amplifiers on the air for more QSOs.
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A page dedicated to Yaesu FL-2100Z linear amplifier for amateur hf bands -
The FL-2100Z amplifier referenced in the following images is the 6-Band model covering 10m thru 160m (no WARC bands) and not the 9-Band version that included the WARC bands. Modifications, schematics and manual -
Repairing and restoring a Yaesu FL-2100Z amplifier -
Adding a full power output 12 meter band capability to the Yaesu FL-2100 despite of 10 meter. -
Common problems and improper operations of Yaesu FL 2100 RF power amplifier -
EB5AGV Workbench: Yaesu FL-2100B amplifier restoration -
Technical specifications and details of the Yaesu FL-2100B HF Power Amplifier -
Reviews of the Yaesu FL-2100 series power amplifier at eham -
The Yaesu FL2100Z is a HF linear amplifier rated for 1200W PEP input, and using two 572B triode tubes. This article explores the recommended operating conditions, and alternatives.