| [TC] ultra-fi engineering | DIY Tube Amplifiers, Horn Information |
| 211-VT4C-Great HiFi tube | DIY Tube Amplifiers |
| 833 Single Ended amplifier | DIY Tube Amplifier |
| Aaholm Audio Pages | DIY Tube Amplifiers |
| AC&DC | DIY Tube Amplifiers |
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| Aha | DIY Tube Amplifiers |
| Alex's Page | DIY Tube Amplifiers |
| Amplificateur Cariou Guilvinec Location Meuble | DIY Tube Amplifiers |
| Analog Audio | DIY Tube Amplifiers |
| André Charlin official website | DIY Tube Amplifiers |
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| audio diy | DIY Tube Amplifiers |
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| Audiophool | Vintage Tube Audio Equipment, DIY Tube Amplifiers |
| AX84 Cooperative Tube Guitar Amp Project | DIY Tube Guitar Amplifier |
| Boozhound Laboratories | Articles, DIY Tube Amplifiers |
| Calcolo di Trasformatori | X-former Calculations, DIY Tube Amplifiers |
| Chris and Sue's Page | DIY Tube Amplifiers |
| Chris's Tube Haven | DIY Tube Amplifiers |
| Classic tube | DIY Tube Ampliers |
| Cyber Workshop in Maizuru | DIY Tube Amplifiers |
| Dave Ewing | DIY Tube Amplifiers |
| DDDAC 2000 | DIY Tube Amplifiers |
| Direct Heated Rob's Home | DIY Tube Amplifiers, Tubes |
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| Dmitry Nizhegorodov's Tube Audio Project | DIY Tube Amplifiers |
| Do It Yourself Forever | DIY Tube Amplifiers |
| Eguchi's Audio Amplifiers | DIY Tube Amplifiers |
| Elec Landy Home Page(E) | DIY Tube Amplifiers |
| Electric Amp Land | DIY Tube Amplifiers |
| Electron Audio Industry | DIY Tube Amplifiers |
| Electronluv | Tube Amplifiers |
| Equipment @ Records Unlimited | OTL Amplifier Project |
| Evolve Power Amplifiers | DIY Tube Amplifiers, Schematics, Forums |
| Fonar audio retro | Online Magazine, DIY Tube Amplifiers |
| Francy - A low Cost SV572 DHT Amplifier | Tube Amplifier Kits |
| Fred Nachbaur's Vacuum Tube Projects | DIY Tube Amplifiers |
| Fred's Audio-Phyle Options | DIY Tube Amplifiers |
| Friedrich Stockhammer | Links, DIY Tube Amplifiers |
| Gabe's Tubes 'n' Stuff | Information and DIY Tube Amplifiers |
| Gary Pimm | DIY Tube Amplifiers, Schematics |
| Gary's Audio Pages | DIY Tube Amplifiers, Schematics |
| Glenn Baddeley - Electronics | Links, DIY Tube Amplifiers |
| Gydotron | DIY Tube Amplifiers |
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| HI Fi Trials | DIY Tube Audio, Tube Amplifiers |
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| Hyousi | DIY Tube Amplifiers |
| Il sito web Musictubes | DIY Tube Amplifiers |
| Infinitude | DIY Tube Amplifiers |
| JA5GYU | DIY Tube Amplifiers |
| JE Labs Homepage! | DIY Tube Amplifiers |
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| Jeremy Epstein's Home page | DIY Tube Amplifiers |
| Jimcom | DIY Tube Amplifiers |
| JimCom Tube and Electronics Hobby Pages.. | DIY Tube Amplifiers |
| Julius Audiophile Homepage | DIY Tube Amplifiers |
| Junji Kouchi Tube Amplifiers and Music Sources | DIY Tube Amplifiers |
| Kamakura | DIY Tube Amplifiers |
| Kame | DIY Tube Amplifiers, Tubes |
| Katelelo Audio | DIY Tube Amplifiers |
| Katoh K | DIY Tube Amplifiers |
| Katsu-san- | DIY Tube Amplifiers |
| Kaz Kobayashi's Home Page | DIY Tube Amplifiers |
| Kazuhiro Katoh | DIY Tube Amplifiers |
| Ken Gilbert | DIY Tube Amplifiers |
| Kikuchi | DIY Tube Amplifiers |
| Kim | DIY Tube Amplifiers |
| Kimura Tetsu | DIY Tube Amplifiers |
| Kishi's Audio Room | DIY Tube Amplifiers, Forum |
| Klaus Schiffer audio | DIY Tube Amplifiers, Information |
| Kosuge Sinkuu | DIY Tube Amplifiers |
| KT88_ValveAmp | DIY Tube Amplifiers |
| Kunio | DIY Tube Amplifiers |
| Kurt Strain's Tube Odd-e-o-file Page | Tube Circuits, speaker projects and more |
| La Hifi High End DIY | DIY Tube Amplifiers |
| LeBong Audio Retro Audio Konzepte | DIY Tube Amplifiers |
| Lee Jaehong 6C33C OTL | Schematic, DIY Tube Amplifier |
| Legend | DIY Tube Amplifiers |
| Löwenkatapult | DIY Tube Amplifiers, Link Lists |
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| Mafrand | DIY Tube Amplifiers, Speakers, Tubes |
| Magnetic SA | Transformers, DIY Tube Amplifiers |
| Manfred's tube audio homepage | DIY Tube Amplifier |
| Marco Pedd | DIY Tube Amplifiers |
| Matthias Brennwald's Homepage | DIY Tube Amplifiers |
| Matunami | DIY Tube Amplifiers |
| MAX heaDrOOM's modding island | DIY Tube Amplifiers |
| Mike's tube amp pages | DIY Tube Amplifier |
| Mikkel Corydon Simonsens | DIY Tube Amplifiers |
| Möhrenbude | DIY Tube Amplifiers, DIY Tube Audio Sites |
| Moriyama | DIY Tube Amplifier |
| MT Audio Design | DIY Tube Amplifiers and Quad gear |
| My 2a3 Amplifier | DIY Tube Amplifier |
| My Homebrewed Vintage Amplifiers Journal | DIY Tube Amplifier |
| My tube amplifier project | DIY Tube Amplifiers |
| My Tube Stuff | DIY Tube Amplifiers |
| Nakataube | DIY Tube Amplifiers, Links |
| Nakatubo | DIY Tube Amplifiers |
| Nakazawa | DIY Tube Amplifiers |
| Nick Dangerous | DIY Tube Amplifiers |
| Nikolic Dragan | Tubes, Tube Amplifiers |
| Norman Koren Vacuum tube audio page | DIY Tube Amplifiers |
| Nuance & Fluence | DIY Tube Amplifiers |
| Nutshell High Fidelity | Speakers, DIY Tube Amplifers, Potentimeters, VSAC |
| Oguri | DIY Tube Amplifiers |
| OKKUN_Audio_Tube_Amplifire | Japanese Tube Amplifiers |
| Paeng-Design | Information about Tube Audio - Articles |
| Paul Cambie's Valve Audio Amplifier and Vintage Tube Radio Restoration Stuff | DIY Tube Amplifiers |
| Pete Millett's DIY Audio pages | DIY Tube Amplifiers |
| Poinz's Audio Pages | DIY Tube Amplifiers |
| Purer | DIY Tube Amplifiers, Forums, Links |
| Putz | DIY Tube Amplifiers |
| Putz homepage | DIY Tube Amplifiers |
| Quad II Modification | DIY Tube Amplifiers |
| RadioPistoia.com - Welcome on RadioPistoia.com | DIY Tube Amplifiers, Radio Collection |
| Raymond's electronics | DIY Tube Amplifiers |
| RCA 813 Pentode Tube Audio Amp | DIY Tube Amplifier |
| Research Design Engineering @ PAEng | DIY Tube Amplifiers, Information about TubeAudio - Articles, Forum |
| RH Design | DIY Tube Amplifiers |
| Richard's Home Page | DIY Tube Amplifiers, Links |
| Richard's Stuff | DIY Tube Amplifiers |
| Roger's Tube Amplifiers & Transformers | Tube Amplifiers Kit |
| Röhrenseite von Hans Borngräber | DIY Tube Amplifiers |
| Roscoe Primrose's Ultra-Fi Page | DIY Tube Audio Site, Links |
| Rudy Godmaire | DIY Tube Amplifiers, Information |
| Russian Valveamplifiers | DIY Tube Amplifiers |
| Sajti | DIY Tube Amplifiers |
| Sakura Systems | DIY Tube Amplifiers |
| Sekido Ryoichi's Audio Page | DIY Tube Amplifiers |
| Self Bias DIY Ultra-Fi Audio | DIY Tube Amplifiers |
| Semfielec | DIY Tube Amplifiers, Capacitors |
| Sempermusica | DIY Tube Amplifiers |
| Shimano-amp-212amp-e | DIY Tube Amplifier |
| Shino-Doraku | DIY Tube Amplifiers |
| Sifakis 838 Amplifier | DIY Tube Amplifiers |
| Son du Lac collection of DIY audiophile machines | DIY Tube Amplifiers |
| Speakers for fun | DIY Tube Amplifiers |
| Spieker Audio Engineering | DIY Tube Amplifiers |
| Sugimoto | DIY Tube Amplifiers |
| Super Triode Connection | DIY Tube Amplifiers |
| Super-OTL-Audio | DIY Tube Amplifier |
| Taste of Sound | Japanese DIY Tube Amplifiers |
| Tatic | DIY Tube Amplifiers |
| Technique et Emotion Musicale | DIY Tube Amplifiers |
| Technopolis-Mars-5874 | DIY Tube Amplifier |
| Tetsu Kimura's | DIY Tube Amplifier, Big Japanese Link List |
| The Audio Pages of Rudy Godmaire | DIY Tube Amplifiers |
| The First Vacuum Tube Audio Web from Indonesia | DIY Tube Amplifiers, Links |
| The Home of Primordial Energy | information from BRUCE DePALMA |
| The Institute Home of tubenutdave | DIY Tube Amplifiers |
| The Musical Machine | DIY Tube Amplifiers |
| Thomas Schick | DIY Tube Amplifiers |
| Thunderstoneaudio | DIY Tube Amplifiers |
| Tim Williams' Home Page | DIY Tube Amplifiers |
| Tjaco's design graveyard | DIY Tube Amplifiers |
| Tnaka | Japanese DIY Tube Amplifier |
| Triode | DIY Tube Amplifiers |
| Triode audio | DIY Tube Amplifiers |
| Triode Dick | DIY Tube Amplifiers |
| Triumvirum Audio | DIY Tube Amplifiers |
| Tube Amplifiers and Music Sources | DIY Tube Amplifiers |
| Tube Amplifilers | DIY Tube Amplifiers |
| Tube Fan Studio | DIY Tube Amplifiers, Forums, Parts |
| Tube Lovers Anonymus | DIY OTL Tube Amplifiers |
| Tube Radio and Audio Amplifier DIY Projects | DIY Tube Amplifiers, Tube DAC |
| Tubeaudio | DIY Tube Amplifier |
| Tutomu Furuya | Japanese DIY Tube Amplifiers |
| Uda directory 2000-01-13 | Japanese DIY Tube Amplifier |
| Ulrich Haumann's Vintage HiFi Pages | DIY Vintage Hifi |
| UltrAnalaog | DIY Tube Amplifier |
| Universal Vacuum Tube Amplifier Fugaku and his Fellows | Japanese modular Tube Amplifier |
| Vacuum Tube Amplifier - Cyber WorkShop in Maizuru | Japanese DIY Tube Amplifier |
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| Vacuum Tube Audio and so on | Japanese DIY site, Tube Amplifiers, Links |
| Vacuum Tube Pages | DIY Tube Amplifiers |
| Vintage Audio World | DIY Tube Amplifiers, Tubes |
| VT-62 Tube Amplifier | Japanese DIY Tube Amplifier |
| W0VLZ | DIY Ham Radio |
| Walter | DIY Tube Amplifiers |
| Whaan | DIY Tube Amplifiers |
| Wonder Machines! | DIY Headphone Tube Amplifiers |
| yun wai tian | DIY Tube Amplifiers |
| Zen clones | DIY Tube Audio Site |