Welagen Amplification is a boutique tube guitar amplifier company founded by Jelle Welagen, a PhD neuroscientist turned amp builder who began modifying and designing amplifiers as a teenager. Each amp is handcrafted by Welagen himself, and the company's design approach draws heavily on the methods of Alexander Dumble, combined with study of classic 1950s–1970s guitar and HiFi tube designs.

The product line centers on Dumble-inspired Overdrive Special models and has grown to include Clean Amplifiers, Vintage Sleepers, and circuits such as the Express (a Trainwreck-style build), Liverpool, Rocket, Overdrive Reverb, and Steel String Singer. Builds are highly customizable, offering choices of coverings, tone-shaping options, and NOS components, with Welagen personally consulting on final voicing for each customer.

The company's reputation sits within the niche of D-style and Trainwreck-style tone chasing, and its amplifiers have appeared on stages and in studios internationally. Welagen emphasizes a research-and-development approach to amp building that reflects its founder's scientific background rather than a mass-production mindset.

Welagen Amps has 2 products cataloged on Equipboard, including Guitar Amplifier Heads.