| Fab Audio | Speakers |
| Fair Radio Sales Company Inc. | Parts |
| Fairman Handcrafted in Denmark, main page | Professional Tube Studio Equipment |
| FAL | Tube Amplifiers, Speakers |
| Farnell | Parts, Tools |
| FCTG's Old Radios | Tube Radios & Related Vintage Items |
| Fedeltà del Suono | Italian Magazine |
| Feliciano Ferretti | Tube Amplifiers, Tube Amplifier Kits |
| Fender | Tube Guitar Amplifiers |
| Ferguson Hill | Speakers |
| Fertin | Speakers |
| Fi Primer | DIY Tube Amplifiers, Schematics |
| Fidelity Audio | Tube Amplifier Kits |
| Finalaudio | Speakers |
| Fine Audio | Retailer |
| FireBottle.com | Links |
| Firebottles! | Vintage Tube Audio |
| First Impression Music | Music |
| First Quality Musical Supplies | Link Lists, Tube Microphones |
| First Sound Preamplifiers | Tube Preamplifiers |
| Fisher Radio Corporation | All about Vitage Fisher Amplifiers |
| Flame Enterprises Inc. | Switches |
| FL-electronic HiFi | Tubes, Audio retailer |
| FM Transmitter | Tube Electronics for Professionals, Retailers |
| Focal Components | Speakers |
| Focal-JMlab | Speakers |
| Fonar audio retro | Online Magazine, DIY Tube Amplifiers |
| Fosgate Audionics | Tube Preamplifier |
| Fostex | Recording Products and Speakers |
| Fourier Components OTL Amplifiers | OTL Tube Amplifiers |
| Frag Jan zuerst- Ask Jan first | A lot of information regarding old tube radios |
| Francy - A low Cost SV572 DHT Amplifier | Tube Amplifier Kits |
| Frank & Ankie homepage | Tubedata |
| Frank & Ankie homepage | Tubedata |
| Frank's Electron tube Pages | Electron Tube Data Sheets |
| Franz Hamberger -tubes | Electron Tube Data Base |
| Fred Nachbaur's Vacuum Tube Projects | DIY Tube Amplifiers |
| Fredmusic | Music Shop for Tubes, Guitar Tube Amplifiers |
| Fred's Audio-Phyle Options | DIY Tube Amplifiers |
| Fricco Referenz Audio | Retailer |
| Friedrich Hunold | Book author, tipps, schematics, forums |
| Friedrich Stockhammer | Links, DIY Tube Amplifiers |
| Friedrich T. Sommer | Ham Radio, Vintage Tube Audio Equipment |
| FS Audioweb | Retailer for Croft, EAR, TRI Tube Amplifieres |
| Fuchs Audio Technology | Tube Guitar Amplifiers |
| Full Compass Systems | Professional Audio, Video, Lighting Equipment |
| Fuller Metric Parts | Screws |
| Fullmusic Electron tubes | Tubes |
| Full-Range Driver Forum | Forum |
| Fun with Fibrillation A Beginner's Guide to DIY Tube Audio | Tube Amplifier building Information |
| Funkamt Flensburg | Schematics, Tube Comparison List, Links, Tube Radios & Related Vintage Items |
| Funky Junk France | Tube Electronics for Professionals |
| Furovisu | DIY Tube Audio Sites |
| Fuses Unlimited | Fuses |
| Fust-electronica | Tubes |
| Fust-electronica, Vacuum Tubes | Tubes |
| Futurlec | Parts |
| Fuzzorama Laboratories | Vintage Audio Gear Service |