| Antique Radio Repair and Restoration | Tube Amplifier Service, Vintage Tube Audio Equipment, Tube Radios & Related Vintage Items |
| R.B. Electronics | Tube Amplifiers |
| R.V.R. Elettronica S.p.A. Home Page | Broadcast Equipment |
| Radian Audio Engineering, Inc. | Replacement Diaphragms - TAD |
| RadiiAudio | Tube Amplifiers |
| Radio 711 | RCA Manual online |
| Radio and Phono Museum | Museum |
| Radio Attic | Tube Radios, Links, Classifieds |
| Radio Bay | National Radio Company |
| Radio Broadcast Transmitters | Ham Radio |
| Radio Daze | Tubes, Parts, Restoration |
| Radio D'Epoca | Tube Radios & Related Vintage Items, Parts |
| Radio Doc's | Ham Radio |
| Radio Electric Supply | Tubes |
| radio electronic tubes | Tubes |
| Radio Era Archives | Tube Radios & Related Vintage Items |
| Radio Experimenters Page | DIY Tube Audio Site, Ham Radio |
| Radio Relics | Tube Amplifier Service, Tubes |
| Radio Tube Supply | Tubes |
| Radioam | Links |
| Radio-Antik | Tube Radios & Related Vintage Items |
| Radiohistorical Society of Finland | Links |
| Radioking Austria | Radio Collection |
| Radiokobo | Tube Radios & Related Vintage Items |
| Radiolampa | Tubes |
| Radiomania | Tube Radios & Related Vintage Items |
| Radiomanie- alte Technik und mehr… | Museums, Tube Radios & Related Vintage Items |
| Radiomuseum | Antique Radio Portal |
| Radiomuseum Rottenburg | Museum |
| Radiomuseum Wien | Tube Radios & Related Vintage Items |
| RadioNostalgia | Tube Radios |
| Radionostalgie | Tube Radios |
| RadioPistoia.com - Welcome on RadioPistoia.com | DIY Tube Amplifiers, Radio Collection |
| radio-tsf.com | Associations, |
| Raedek Electronics | Tubes |
| Rainbow Electronics | Tube Amplifier Services, Modifications |
| Rakumeisha | Tubes, Records |
| Ram Labs | Tube Amplifiers |
| Rank-Concept | Tube Amplifiers |
| Raphael audio workshop - tube audio kits | Tube Amplifiers Kits |
| Rare Tubes | Vacuum Tubes Retailers New and NOS Tubes |
| Ray Samuels Audio | Tube Preamplifiers |
| Raychem | Braids, Tubings & Heat Shrinks |
| Raymond's electronics | DIY Tube Amplifiers |
| Raysonic | Tube Amplifiers |
| RCA 813 Pentode Tube Audio Amp | DIY Tube Amplifier |
| RCA PG5 | Manual |
| RCC | Retailer |
| RCD Components Inc. | Resistors, Coils, Inductors |
| RCDavis Amplifiers | Tube Guitar Amplifiers |
| Real Audio Technika | Tube Amplifiers, Output Transformers |
| rec.audio.high.end | Newsgroup |
| rec.audio.marketplace | Newsgroup |
| rec.audio.opinion | Newsgroup |
| rec.audio.tech | Newsgroup |
| rec.audio.tubes | Newsgroup |
| Records UnlimitedEquipment | Vinyl Records, OTL Tube Amplifier |
| Red Rocks Audio | Tube Electronics for Professionals |
| Red Rose Music | Tube Amplifiers, Speakers, EQ, Cables, ... |
| REDesignz...Industrial Design Consultant | Tube Amplifiers |
| Reference 3A Loudspeakers | Speakers |
| Reference Tube | Tube Amplifiers, Tube Electronics for Professionals |
| Reimer Speaker Systems | Speaker Systems |
| Reimyo | Tube Amplifiers |
| Reinhöfer Electronic | Tube Amplifier Kits, Tubes, Parts |
| Reliable Capacitors | Coupling Capacitors |
| Remmos Audio | Tube Amplifiers, Tubes |
| Renaissance Amplification | Tube Amplifier |
| Renaissance Audio Electronics | Tube Amplifiers |
| Requisite Home Page | Professional Tube Electronics |
| Research Design Engineering @ PAEng | DIY Tube Amplifiers, Information about TubeAudio - Articles, Forum |
| Response Audio | Retailer |
| Retro Audio | Museums |
| Retro Electronics and Audio Lab | Tube Amplifier Service |
| Retro Sound Vintage Valve Amp Parts & Guitar Effects | Tube Guitar Amplifiers, Tubes, Service |
| Retrodaze Audio Products | Retailer |
| Retrovox Valve Audio Australia | Gallery |
| Reussenzehn Hifi | Tube Amplifiers |
| Reynolds Valveart | Vintage Guitar Amplifiers |
| RF Parts Company™ Amateur Radio Catalog | Tubes, Parts |
| RFE International Home Page | Capacitors, resistors, Inductors |
| RH Design | DIY Tube Amplifiers |
| Richard's Home Page | DIY Tube Amplifiers, Links |
| Richard's Stuff | DIY Tube Amplifiers |
| Richardson Electronics | Tubes and Parts, Amperex Bugle Boy |
| Ridge Farm Studio | Tube Microphone Amplifier |
| RigPix Database | Ham Radio |
| Rik Stoet - Holland | Retailer |
| Rivera Amplifiers | Tube Guitar Amplifiers |
| rkock guitars & amps | Tube Guitar Amplifiers |
| RL Acoustique | Speakers |
| RNA Collectibles | Tube Radios |
| Roadsters | Links |
| Robert van dyke | Vintage Tube Audio Equipment |
| robertshifi | Links |
| Robertson Electronics | Tube Amplifier Services, Parts |
| RobyattAudio | Private Tube Audio Sites |
| Roccaforte Amps | Tube Guitar Amplifiers |
| Rocktron | Tube Guitar Amplifiers |
| Rodemicrophones Gateway | Tube Microphones |
| Rod's Classic & Antique Radios | Military VT Tube Cross Reference |
| Rodspages Homepage | Museum |
| Roehrenfieber.de - mit Röhren hören | Information, Links |
| Roger Russell's McIntosh History Page | Museums |
| Roger's Tube Amplifiers & Transformers | Tube Amplifiers Kit |
| Rogue Audio | Tube Amplifiers |
| Röhren und hören | Forum |
| Röhrenfieber | Private Tube Audio Sites |
| Röhrenfreak | DIY Tube Audio Site |
| Röhrenmanufaktur | Tube Amplifiers |
| Röhrenmuseum tube museum | Collections |
| Röhrenseite von Hans Borngräber | DIY Tube Amplifiers |
| Rör & vinyl | Private Tube Audio Sites |
| Rör och rörpriser | Tubes |
| Roscoe Primrose's Ultra-Fi Page | DIY Tube Audio Site, Links |
| Rotac Électronique inc. | Tube Amplifier Kits |
| Round-Up Electronics | Tubes, Tube Radios |
| RP Electronics | Tubes, Test Instruments , Power Supplies |
| RS - Components | Parts |
| Rsc-Valves.com, your site for radio tubes | Tubes |
| RTT Microphones | Tube Microphones |
| Ruby Tubes | Tubes |
| Rubycon Corporation | Capacitors |
| RudiStor Sound Systems | Tube Amplifiers |
| Rudy Godmaire | DIY Tube Amplifiers, Information |
| Rummage antique, radio,stereo,tube | Collector |
| Russian Old Radios | History of russian radios |
| Russian Old Radios | History of russian radios 2nd url |
| Russian Tube Factories and Logos | Logos |
| Russian Tubes | Tubes |
| Russian Valveamplifiers | DIY Tube Amplifiers |
| R-Vac Electronics | Tubes |
| Tyler Acoustics | Speakers |