Reyes 303 and Kill Filter: Free Harmony H303 Tube Amp Plugins
Reyes Amplifonics has released Reyes 303 and Kill Filter, two free plugins that model the iconic Harmony H303 tube amp. Both are available directly from the developer with no sign-up required.
What’s included
The two free plugins are:
- Reyes 303: a faithful emulation of the original Harmony H303 tube preamp, capturing its warm, saturated tone and dynamic response.
- Kill Filter: a dedicated high-pass and low-pass filter section designed to shape tone and reduce unwanted frequencies before the amp stage.
Both plugins run in VST3, AU, and AAX formats on Windows and macOS, supporting sample rates up to 192 kHz. They are royalty-free for commercial and non-commercial use, making them ideal for producers, engineers, and sound designers.
How to download
Visit the official Reyes Amplifonics plugins page to grab both plugins in one download. The archive includes installer packages for each plugin and a quick-start guide.
Use cases
Use Reyes 303 for guitar, bass, synth, or drum bus saturation. Pair it with Kill Filter to clean up low-end rumble or tame harsh highs before the amp stage. The combination is especially useful for retro-inspired mixes, lo-fi production, and vintage-style processing.
Related terms
- tube amp emulation
- saturation modeling
- high-pass/low-pass filtering
- vintage preamp tone
- royalty-free plugins
These plugins complement the paid Triode model, which offers deeper tone shaping at $39.99.
Free plugins for amp modeling are rare, and Reyes Amplifonics’ pair delivers authentic H303 character without cost. Both are stable across major DAWs and provide CPU-friendly processing, making them practical tools for everyday production.
FAQ
Are Reyes 303 and Kill Filter really free? Yes — both plugins are free to download and use, with no sign-up or watermark.
What formats do Reyes 303 and Kill Filter support? VST3, AU, and AAX on Windows and macOS.
Can I use these plugins commercially? Yes — both are royalty-free for commercial and non-commercial projects.