| Ali Audio | Retailer, Forums |
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| Das Audioforum | German DIY Forums |
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| Der Audiotreff im Internet | Forums |
| DHTsound.com | Japanese Portal, Parts, Tube Amplifier Kits, tubes, forums, links |
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| EV Online | Speakers, Forum |
| Evolve Power Amplifiers | DIY Tube Amplifiers, Schematics, Forums |
| ExDreamForum | German Discussion Forum |
| Friedrich Hunold | Book author, tipps, schematics, forums |
| Full-Range Driver Forum | Forum |
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| HeadWize | Headphone Resource Site, forum |
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| HiFi - Audio - Video - Selbstbau - CarHiFi - Diskussionen bei audiomap.com | German Audio Forum, Links |
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| Hoffman Tube Amplifiers | Tube Guitar Amplifiers, Parts, Forum |
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| Jonka.net | Forums, Links |
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| Marshall Arts | Information about Tube Guitar Amplifiers |
| Oh's Audio | Tube Amplifiers, Tube Amplifiers Kits, Forum, Parts |
| Onkel frihu's Community das Forum | German Forum about Tube Audio |
| Passion...Tube | Forums |
| ProSoundForum.com | Forums |
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| Purer | DIY Tube Amplifiers, Forums, Links |
| RadioNostalgia | Tube Radios |
| Research Design Engineering @ PAEng | DIY Tube Amplifiers, Information about TubeAudio - Articles, Forum |
| Röhren und hören | Forum |
| Röhrenfieber | Private Tube Audio Sites |
| Shins Audio | Forums |
| Simpletube | Forums |
| Steve Hoffman | Forum, Music |
| Svetlana Tubes @ www.ezboard.com | Svetlana Tubes Message Board |
| The AM Window | Ham Radio, Forum, Links |
| The Circuit Archive | Schematics, Forum |
| The Echo Loft | Forums |
| The Knight Kit Bulletin Board | Knight Forum |
| TNT-Audio Addicts | Forum |
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| Transcendent Sound | OTL Tube Amplifiers, Kits, Books, BBS |
| Tube Corner | German global bi lingual audio forum |
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| Vacuum Tube Amplifier | Japanese Tube Audio links, BBS |
| Vintage Guitar on the World Wide Web! | Tube Guitar Amplifiers |
| Vintage H.H. Scott Hi-Fi Stereo Archive | All about vintage Scott tube audio products |
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| World Tube Audio Portal Forum | The Forum of this site |
| www.pa-forum.de | Forums |
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