| # | Project | Comments | Sub-type | # parts | Tubes used | | 1 | 2 x 40 W Valve amplifier with Active Grid Biasing | Parts count is for both channels | Active Grid Bias | 32.0 | ECC81, EL84 (4) |
| 2 | Audio Amplifier | From November 1951 "Electronics" Magazine | Cathode Follower | 13.0 | 6AS7G(2) |
| 3 | 2A3 Single Ended cathode follower drive amplifier | What's with the background of this web page? | Cathode Follower | 19.0 | 6U8, 2A3 |
| 4 | My first tube amplifier | Intended for use as a separate state to have around for radio use. Good walk-through of technical design principles. | Class A | 7.0 | 12AX7 |
| 5 | Amplifier “RADIO LAMPA” with 22 tubes 2SH27L | [from German] 22 tubes make sense, if they are very small, and you have enough time on you hands to over-engineer something like this. Bravo! | Class A | 65.0 | 2SH27L(22) |
| 6 | Stereo amplifier, four times PL504 | [from German] Nice tall, thin power tubes with improvised (?) caps for a cool new look. | Class A Amplifier | 12.0 | PL504(2) |
| 7 | Beam power tube EL504 | [from German] Similar to his PL504 Verstarker, but allows switching from triode to pentode modes. Also different packaging. | Class A Amplifier | 14.0 | EL504(2) |
| 8 | Voorversterker gebouwd rond de B406 DHT | In Dutch, I believe | Mu-follower | 17.0 | 12HG7,B406 |
| 9 | Mu-stage voorversterker rond de 6H23, 6922,ECC88 | In Dutch, I believe | Mu-follower | 20.0 | 6H23 |
| 10 | EL86 OTL Amplifier | Schematic only. | OTL | 13.0 | EL86 (2) |
| 11 | Low Voltage OTL Amplifier | Schematic only. Oh, and I snuck in some transistors. | OTL | 13.0 | 12B4 |
| 12 | 25L6 Power-Transformerless Amplifier | He discusses the trouble-shooting of some "sonic flaws" | OTL | 21.0 | 12SN7,25L6(2) |
| 13 | Parallel Cathode Follower Amplifier | How to string along the 6DK6's in parallel; the more the merrier | OTL | 22.0 | 12AU7, 6DK6 (3) |
| 14 | 12B4 OTL Amplifier | Schematic only. | OTL | 24.0 | 6AU6, 6S4, 12B4 (2) |
| 15 | Horizontal Sweep Tube OTL | How to string along the 6CD6's in parallel; the more the merrier | OTL | 32.0 | 6SJ7, 6AQ5, 6CD6 (3) |
| 16 | Power output stage with 4 PL519 | [From German] "For Low Impendance Transducers. | Parallel | 43.0 | PCL82, PL509 (4) |
| 17 | 2A3 PSE - Parallel Single Ended | Is this really the right title? | Parallel SE | 10.0 | 5842, 2A3 (2) |
| 18 | OTL Amplifier | [In Vietnamese] First project on the page | Parallel SE | 22.0 | 6SJ7, 6SN7, 6080 |
| 19 | 6CK4 Direct-Coupled PP Amplifier | See the text discussion at http://tinpan.fortunecity.com/saints/668/primer/se.html | Push Pull | 12.0 | 12BZ7 (2), 6CK4 (2) |
| 20 | Audio Amplifier with 2x807 | [In Dutch] Schematic Only. 120 Watts | Push Pull | 12.0 | 6L6, 807 (2) |
| 21 | Push Pull Amplifier | Schematic, parts list, and some results. | Push Pull | 13.0 | 6C45(2) |
| 22 | 31LQ6 Push Pull Amplifier | Proof that those weird tubes might be worth something | Push Pull | 15.0 | 6EA8, 6DJ8, 31LQ6 (2) |
| 23 | 16A8 in Push Pull configuration | [From Japanese]. Push Pull with a triode/pentode acting as drivers and power amps. | Push Pull | 16.0 | 16A8 (2) |
| 24 | 813 Matrix Amplifier | Minimal discussion | Push Pull | 16.0 | 6BM8, 813 (2) |
| 25 | Balanced low-Z mic/line amp with TUBES | Balanced line amplifier. Schematic only. | Push Pull | 18.0 | 12AU7 (2) |
| 26 | PP Amp Using "Iron Concertina" Phase Splitter | Interesting circuit. Author has some ideas on the transformer | Push Pull | 18.0 | 12B4, 2A3 |
| 27 | 600 Watt Audio Modulator | [In Dutch] Schematic Only. 800 Watts | Push Pull | 19.0 | EL84, EL34 (2), 810 (2) |
| 28 | Push Pull Tube Amp | I like his comments about the sound of the music and examples of good sources. Movie cartoons as a sound source! | Push Pull | 19.0 | 6EU7, 6BQ5 (2) |
| 29 | AhA! 2a3 Push-Pull amplifier | Based on "JE labs Stereo pp2a3" | Push Pull | 20.0 | 6SN7(2),2A3(2) |
| 30 | 6B4 PP Amp | See the text discussion at http://tinpan.fortunecity.com/saints/668/primer/se.html | Push Pull | 20.0 | 6SN7, 6DJ8, 6B4 (2) |
| 31 | Experimental Amplifier | [From Japanese] Strange circuit. | Push Pull | 20.0 | 6BQ7, 6AU6, 6V6 |
| 32 | 171A Push Pull Amplifier | All tubes from the 20s and 30s | Push Pull | 21.0 | 227 (2), 171A (2) |
| 33 | Parallel Push Pull Amplifier | Translated from the German | Push Pull | 22.0 | ECC83,EL34(2) |
| 34 | 2A3 Push Pull Amplifier | Schematic only. Main index is http://www.bonavolta.ch/hobby/en/audio/audioel.htm#Amps | Push Pull | 23.0 | 12AU7, 6C4 (2), 2A3 (2) |
| 35 | Ten Watt Triode Amplifier | Schematic only. | Push Pull | 24.0 | 6AV6, 6CG7, 6BX7 |
| 36 | 6L6 Push Pull Amp | Schematic only. 20 Watts | Push Pull | 24.0 | 6SL7, 6SN7, 6L6 (2) |
| 37 | 807 Ultralinear PP Amp | See the text discussion at http://tinpan.fortunecity.com/saints/668/primer/se.html | Push Pull | 24.0 | 6SL7, 6DJ8, 807 (2) |
| 38 | 171A class A push-pull amplifier | Uses tubes from 20's and 30's. | Push Pull | 24.0 | 227(2),171A(2) |
| 39 | 6146 Push Pull Amplifier | Schematic only. 20 Watts | Push Pull | 25.0 | 6SN7 (2), 6146 (2) |
| 40 | Official Stromberg-Carlson APH-1050 Shrine | Conversion of a PA system to a HiFi Amplifier | Push Pull | 25.0 | 6GH8, 6CD6 (2) |
| 41 | Stereo integrated 845 SE amp | 6DN7 is similar to 6EA7. And I love the looks of the 845! | Push Pull | 25.0 | 6DN7 (2), 845 (2) |
| 42 | 6EM7 Push Pull Amplifier | Interesting approach. | Push Pull | 27.0 | 6AQ8, 6EM7 (2) |
| 43 | Double Push Pull 6V6 Amp | Schematic only. Double push pull cathode follower. | Push Pull | 28.0 | 6SN7 (2), 6V6 (4) |
| 44 | 6EM7 Push Pull Amplifier | In English with Spanish commentary | Push Pull | 28.0 | 6AQ8,6EM7(4) |
| 45 | A 6080/6AS7G-Verstärker | [From German]. Why the extra tube? | Push Pull | 29.0 | ECC81, 6189, 6080 (2) |
| 46 | 25CD6 Amplified | [From Japanese]. Story and schematic. | Push Pull | 30.0 | 12AT7, 12AX7, 25CD6 |
| 47 | Basic Audio Amplifier | In English and Dutch. | Push Pull | 30.0 | ECC83,EL84 |
| 48 | Push-Pull 845 | [In French]. | Push Pull | 30.0 | 6J5, R130, 845 (2) |
| 49 | 6AH4 in Push Pull configuration | [From Japanese]. Uh, Oh, another MOSFET in the name of science. All projects on this site have a "publication page" with discussion. | Push Pull | 31.0 | 6FQ7, 6AH4 |
| 50 | Dogzilla Power Amp | 200 Watts powered by six 807's | Push Pull | 31.0 | 6SN7, 807 (6) |
| 51 | High-Fidelity Tube Amplifier | From the RCA Receiving Tube Manual | Push Pull | 32.0 | 12AU7, 6AU6 (2), 6V6 (2) |
| 52 | LEAK " POINT ONE " AMPLIFIER | From a 1945 article. | Push Pull | 33.0 | EF36,ECC33,KT88(2) |
| 53 | An 813 Amplifier | Any time I see over 1,000 volts on the plate I know someone was serious. | Push Pull | 33.0 | EC86,5842,A2134(2),813(2) |
| 54 | Push-Pull Class A 2A3 Stereo Amp | Last paragraph describes invasion of his garage by Keith, Mick and company | Push Pull | 33.0 | 6SL7,6SN7,2A3(2) |
| 55 | ECL82'er | [From German] ECL82 = 6BM8. There is an auxiliary preamp at the bottom of the page (5 parts) | Push Pull | 33.0 | ECL82 (2) |
| 56 | Push-Pull Class A 2A3 Stereo Amp | Nice writeup on his experiments with modifications | Push Pull | 34.0 | 6SL7,6SN7,6L6 |
| 57 | Projekt Mono 845 | [In German] Looks like the prototype for a commercial product | Push Pull | 34.0 | 6DN7, 845 |
| 58 | 807 Push Pull Amplifier | Schematic only. From 1949. | Push Pull | 34.0 | 6SN7 (2), 807 (2) |
| 59 | Mamont (aka Mammoth, Mamoet, Mammut ...) power amp | Was "built around Atma-Sphere M-60 design". But I have to admit I can't tell what is going in with this schematic. | Push Pull | 35.0 | 6SN&(8) |
| 60 | Ultralinear Amp with EL508 | [From German] Quite involved power supply. | Push Pull | 39.0 | EF86, ECC83, EL508 (2) |
| 61 | Martin Logan SL3 direct-coupled tube poweramp | Whew! Even the speaker (I think . . .) is part of the schematic. | Push Pull | 48.0 | E180F, 6EM7 (2), SV572-3 |
| 62 | 60 Watt Audio Power Amplifier | [In Spanish]. Schematic only. For a photo, click the link at the bottom of the page and slect Foto for this project. | Push Pull | 50.0 | 6AN8, KT88 (2) |
| 63 | RA-100 Integrated Amplifier | Monster project by Fred Nachbauer. Puts us all to shame. | Push Pull | 191.0 | 12AX7 (4), 12AT7 (4), 6CB6 (2), 6L6 (4), 0B2 (2) |
| 64 | Simple push-pull amplifier | [from German] Simple approach, and different way of setting up the schematic. | Push-Pull | 8.0 | EL504 |
| 65 | P-Röhrenverstärker X-MAS-Wonder 2005 | [from German] Made from cheap parts | Push-Pull | 17.0 | PCL85(4) |
| 66 | Amplifier with EL84 | [From French]. EL84 = 6BQ5 | Push-Pull | 19.0 | 12AX7, 6BQ5 |
| 67 | 832 Transmitting Tetrode P-P Amplifier | Now that is one weird-looking tube. Kind of squat and "cute", I guess. | Push-Pull | 27.0 | 12AT7,832 |
| 68 | Restauro LEAK TL/12 Point One | [In Italian] At least it looks like an amplifier to me. | Push-Pull | 43.0 | EF36, ECC33, KT66(2), GZ32 |
| 69 | Battery Powered 26 Tube Amplifier | Interesting discussion about what it takes to run an amplifier's B+ on batteries, and charge them, in the real world. | RC Loaded | 10.0 | 2C51, 26 |
| 70 | 3 Watt SE Amplifier with 6BM8 Tube | That 6BM8 keeps popping up. | SE | 16.0 | 6BM8 |
| 71 | OTL - Output Transformerless Tube Amp | First project on the page | SEPP | 9.0 | E182CC, ECC83, 6C33 (2) |
| 72 | 3 Watt EL34 SE-AMP | Interesting construction material | Single Ended | 5.0 | EL34 |
| 73 | 6J5 Single stage UTC A-25 Output | In Chinese or English; Interesting main site. Can use 6J5 (which is 1/2 a 6SN7) | Single Ended | 5.0 | 6SN7 |
| 74 | Single Ended Amplifier | Schematic, parts list, and some results. | Single Ended | 7.0 | 6C45 |
| 75 | Thorium Power Amp from VT52.com | Experiment with Low Mu high power tubes | Single Ended | 7.0 | 10Y, 842 |
| 76 | Single Ended Dual Mono Amplifier | Not sure of the point here. | Single Ended | 7.0 | 6C45 |
| 77 | Parallel Single Ended Amplifier | More variations on a theme | Single Ended | 8.0 | 6C45 |
| 78 | Simple 45 Amplifier | Suggests 45 or 2A3 tubes. | Single Ended | 9.0 | 6SL7, 45 |
| 79 | Low Cost Triode SET Amplifier | Author notes that even with new parts this amp would be under $100. 13EM7 has a 12.6V heater; see the 6EM7 | Single Ended | 9.0 | 13EM7 |
| 80 | 2A3 SE Amplifier | Schematic only. 2A6 is driver. | Single Ended | 9.0 | 2A6, 2A3 |
| 81 | Audio amplifier with ECL80 | [In Slovenian?] The stereo version further down the page is an interesting variant. | Single Ended | 9.0 | ECL80 |
| 82 | Guided Missle Amp | Made with Bendix military-grade hardened glass radar tubes or something like that. | Single Ended | 10.0 | 6SL7, 6AR6 |
| 83 | 6V6 SE #1 Amp | Schematic only. From 1949. SE cathode follower. | Single Ended | 10.0 | 6SJ7, 6V6 |
| 84 | J.C. Morrison Circuit - Amplifier | [In German]. Minimal parts. | Single Ended | 10.0 | 6SL7, 2A# |
| 85 | Audio amplifier with EL84 | [In Slovenian?] | Single Ended | 10.0 | ECC83, EL84 |
| 86 | Early "Ultrapath" Circuit Amplifier | I like the relaxed circuit commentary: "0,43mA through a tube seems too little to me , the 500 ohm resistor is just there to give you a headache " | Single Ended | 11.0 | 2A6, 2A3 |
| 87 | 6CS7 Single Ended Amplifier | Chassis is a cookie can. Translated from the Japanese | Single Ended | 11.0 | 6CS7 |
| 88 | A Single Ended 12B4A Integrated Amplifier. 1.5 Watts. | Really fun walk through of the circuit and design process for this 1.5W simple amp. | Single Ended | 11.0 | 6AU6, 12B4A |
| 89 | Yet Another 2A3 Amplifier | Schematic only. | Single Ended | 11.0 | 2A6, 2A3 |
| 90 | 6BX7 Amplifier | Schematic only. The 6BX7's are in parallel | Single Ended | 11.0 | ECC81, 6BX7 |
| 91 | Loftin and White 2A# SE Amp | [In German]. Minimal parts for 2A6 and 2A3. | Single Ended | 11.0 | 2A6, 2A3 |
| 92 | 3V4 SE Stereo Amplifier | In Japanese | Single Ended | 11.0 | 1U5, 3V4 |
| 93 | Morrison's Micro 3.5 Watt Amp | Schematic only. | Single Ended | 11.0 | 6SL7, 2A3 |
| 94 | 6AC5 Single Ended Amplifier | Not really sure I got the tubes right (or that it matters?) | Single Ended | 12.0 | 6AC5(2),6CG7 |
| 95 | "Kismet" Amplifier | From a German site. Main page is http://members.aol.com/ikschiffer/index.html | Single Ended | 12.0 | 6922,2A3 |
| 96 | "Free Lunch" from Jeremy Epstein | Extensive discussion of his thought process. Direct coupled. | Single Ended | 12.0 | 6C45, 2A3 |
| 97 | WE-717A + 2A3 SE amplifier | Pretty transformers | Single Ended | 12.0 | WE717A,2A3 |
| 98 | VT-52 SE Amplifier #2 | Schematic only. Uses 1/2 E83CC. | Single Ended | 12.0 | E83CC, VT52 |
| 99 | 572-10 Triode Amplifier | This circuit was apparently used by Svetlana to promote their 572-10 triode | Single Ended | 12.0 | 6BM8, 572-10 |
| 100 | Amity and Aurora | Two Amplifiers with VERY extensive and perceptive comments | Single Ended | 12.0 | ECC99, 300B |
| 101 | 300B Amplifier | Schematic only. | Single Ended | 12.0 | 6SJ7, 300B |
| 102 | " MONOtriodino 3 " a 2a3 DHT SE amplifier | I like the Italian sites. Everything is so exciting! Sample: "from an electrical point of view (driving capabilities, band, slew rate) this was clearly outstanding SE"! | Single Ended | 12.0 | 6SN7,2A3 |
| 103 | Tube Headphone Amplifier | Very complete page - practical discussion, curves, printed circuit boards, etc. | Single Ended | 12.0 | 6SN7, E182CC |
| 104 | 6EM7 SE Amplifier | Interesting circuit board mounting | Single Ended | 12.0 | 6EM7 |
| 105 | Single Ended 6BQ5 Amplifier | Built on a Zenith base. | Single Ended | 12.0 | 12AX7, 6BQ5 |
| 106 | VT52 Amplifier | Schematic only. | Single Ended | 12.0 | E83CC, VT52 |
| 107 | Half-Watt transformer-coupled 6EM7 amp | I greatly appreciated the history lesson and how it applied to the 6EM7. I also notice he used a filament transformer as an output transformer for this tube (which I've done before). | Single Ended | 12.0 | 6EM7 |
| 108 | 1626 SE amplifier | "The Jeremy Epsteins DC-coupled variant of the Darling amp with two parallelled 1626s per channel" | Single Ended | 12.0 | 8532,1626(2) |
| 109 | Experimental 6EM7 Amplifier | First message in the thread has a link to the schematic | Single Ended | 12.0 | 6EM7 |
| 110 | SV572-3 Single Ended Amplifier | It's always heartening when they say "This project can kill you!" | Single Ended | 13.0 | 6SN7,6BX7,SV572-3 |
| 111 | Stereo SE EL34 HiFi Amplifier | From Angela Instruments | Single Ended | 13.0 | 6SL7, EL34 |
| 112 | 2A3 Amplifier on a Budget | Short explanation | Single Ended | 13.0 | 12AX7, 2A3 |
| 113 | Direct Reactance Drive SE 300B Amplifier | Why can't MY troubleshooting produce this: "I fired up the system again and absolutely soiled my drawers. I had never heard sound like this from my system. It was just huge. Clean, dynamic, galactic soundstage." | Single Ended | 13.0 | 6AQ8,300B |
| 114 | 6AQ5 Amplifier | Schematic only. | Single Ended | 13.0 | 12AT7, 6AQ5 |
| 115 | 6BM8 Amp | [From Korean] The translation is interesting. | Single Ended | 13.0 | 6AK5, 6BM8 |
| 116 | 6V6 Hi Fi Amplifier | "The schematic is from diyaudio.co.kr, which I believe is a Korean site - how cool is that?" | Single Ended | 13.0 | 6SL7,6V6 |
| 117 | DIY SET Amp | The Netherlands | Single Ended | 14.0 | 6N1P, EL34 |
| 118 | Single ended 6s4 amplifier with a 6dj8 SRPP driver stage | Similar to the 6S4 Micro Triode Amp | Single Ended | 14.0 | 6DJ8, 6S4 |
| 119 | VT-52 SE Amplifier #3 | Schematic only. The ECC83's are in parallel. | Single Ended | 14.0 | E83CC, VT52 |
| 120 | Simple 45 / 2A3 | Another take on a classic design from the "RCA tube R-C amp chart" | Single Ended | 14.0 | 6SL7, 45 |
| 121 | Gary Pimm Phono Amp | The Netherlands. Interesting tubes. | Single Ended | 14.0 | 6ER5, 6GK5 |
| 122 | 6EM7 amplifier | [From Japanese]. Ascii schematic. | Single Ended | 14.0 | 6EM7 |
| 123 | 6AS7 SE Amplifier | Looks like a good beginner project | Single Ended | 14.0 | 12AU7,6AS7 |
| 124 | EL84 SE Hi Fi amplifier | [From German]. With negative feedback. | Single Ended | 14.0 | ECC83, EL84 |
| 125 | JE Labs Stereo Single Ended 2A3 Amplifier | 2001 Edition. Good discussion of parts. | Single Ended | 14.0 | 6SL7, 2A3 |
| 126 | 2A3 single ended power amplifier | Translated from the German. | Single Ended | 14.0 | E80CC,2A3 |
| 127 | Wardsweb Direct Coupled 2A3 | Pretty slick for a first-timer | Single Ended | 14.0 | 6SL7, 2A3 |
| 128 | WE310 Jean Higara design Amplifier | From "Jean Hiraga's book , la maison de l'audiophile" | Single Ended | 14.0 | WE310, VT52 |
| 129 | EL84 Single Ended Amplifier | Japanese builder, but page is in English | Single Ended | 14.0 | 6AQ8,EL84 |
| 130 | 2A3 SE Amp - from tutorial | See the text discussion at http://tinpan.fortunecity.com/saints/668/primer/se.html | Single Ended | 14.0 | 6SL7, 2A3 |
| 131 | 6EW7 SE Amplifier | Lots of pictures of this nice-looking kit (apparently cheap, too, when not sold out). | Single Ended | 14.0 | 6EW7 |
| 132 | 6DN7 SE amp | 6DN7 is a dissimilar triode. This article makes me envious of people who seem to swim in a sea of hand-wound output transformers. | Single Ended | 15.0 | 6DN7 |
| 133 | Minivollamps single end with EL34 | [From German]. No schematic, but the circuit is probably typical. More important is the construction approach, which really seems doable. | Single Ended | 15.0 | 12AX7, 6V6 |
| 134 | Loftin White VT52 Amplifier | More wry schematic commentary: "Lots of parallelling of capacitors , automatic bias everywhere" | Single Ended | 15.0 | E83CC, VT52 |
| 135 | 845 Pramp. | Author says "These [Japanese] are crazy! I wish I could listen to one of these!" | Single Ended | 15.0 | 845 (2) |
| 136 | Single Ended eXperimenter's kit | Uses the 6DN7 dissimilar triode so you have both driver and power amp in same section. | Single Ended | 15.0 | 6EM7 |
| 137 | 6EA7 Amplifier | No schematic here, but the pictures are nice. See some of the 6EM7 amps for a circuit. | Single Ended | 15.0 | 6EM7 |
| 138 | Single Ended Amp Using 45 DHT's | I think this is from Glass Audio | Single Ended | 15.0 | 6SN7,45 |
| 139 | 6V6 SE #2 Amp | Schematic only. From 1957. 4.2 watts. Used as a treble amplifier. | Single Ended | 15.0 | 6J7, 6V6 |
| 140 | 300B SE Amp - from tutorial | See the text discussion at http://tinpan.fortunecity.com/saints/668/primer/se.html | Single Ended | 15.0 | 6SN7, 300B |
| 141 | 6DN7 giant killer amp | Uses only 2 tubes for stereo | Single Ended | 15.0 | 6DN7 |
| 142 | 35l6 Single Ended Amplifier | Preamp and power stage. Translated from the Japanese | Single Ended | 15.0 | 12AX7,35l6 |
| 143 | 50BM8 Single Ended Amplifier | More avoidance of the power transformer | Single Ended | 15.0 | 50BM8 |
| 144 | 1626 Single Ended Amplifier | Preamp and power stage. Translated from the Japanese | Single Ended | 15.0 | 6DJ8,1626 |
| 145 | The building of a tube amplifier | [From German]. Shows some photos of vacuum tube assembly, etc. | Single Ended | 15.0 | 12AX7, EL84 |
| 146 | 6EM7 SE Amplifier | Look at picture to see a triumph of compact thinking. | Single Ended | 15.0 | 6EM7 |
| 147 | VT52 Amplifier | Author examines many different types of 45 tube, heaping praise all around | Single Ended | 15.0 | RE134, VT52 |
| 148 | 211 Amplifier | Schematic only. | Single Ended | 16.0 | 6AU6, 12BH7, 211 |
| 149 | JE Labs 300B SE Amp | "I am merely a 'triode chef' mixing a concoction of ingredients" | Single Ended | 16.0 | 6SN7, 300B |
| 150 | 6AQ5 Amplifier | [From Japanese]. Schematic only. | Single Ended | 16.0 | 6AV6, 6AQ5 |
| 151 | 300B Single Ended Triode Mono Block Amplifier | After the JE Labs version | Single Ended | 16.0 | 6SN7, 300B |
| 152 | One tube 6BM8 SingleEnd FET input | Translated from the Japanese | Single Ended | 16.0 | 6BM8 |
| 153 | 6550 Amplifier | "Power tubes can be use EL34 , KT88 , 6L6GC instead of 6550" | Single Ended | 16.0 | 12AX7(2),6550 |
| 154 | PCL82 SE Amplifier | "Here are some pictures (I warned you: I am the least talented chassis builder on this planet !)" (I like it, though, K3UH) | Single Ended | 16.0 | PCL82(2) |
| 155 | Another 6AS7 Amplifier | [In Vietnamese] Scroll 60% of way down page to Post #33. | Single Ended | 16.0 | 6DJ8, 6AS7 |
| 156 | 6L6 SE Amp - from tutorial | See the text discussion at http://tinpan.fortunecity.com/saints/668/primer/se.html | Single Ended | 16.0 | EF86, 6L6 |
| 157 | Clarion: A simple 2A3 Project | PDF file. Extensive photos and description. | Single Ended | 16.0 | ECC89, 2A3 |
| 158 | SETA - Single Ended Tube Amplifier | From Andrea Ciuffoli. Check out his extensive projects page. | Single Ended | 17.0 | 6SN7, KT90 |
| 159 | Stereo output stage single end AClet with PCL86 | [From German]. Very nice looking. | Single Ended | 17.0 | PCL86 |
| 160 | A PX25 SE-power amplifier | The Ca is "an exotic tube" | Single Ended | 17.0 | Ca,PX25 |
| 161 | Single Ended Class A2 SV811-10 Stereo Amp | Nice complete writeup | Single Ended | 17.0 | 6SL7,6SN7,6AS7,SV811-10 |
| 162 | Single Ended, Single Transformer ESL Amplifier Project | Ongoing project and commentary | Single Ended | 17.0 | 6SN7,6c33 |
| 163 | 6J7 Driving a 300B Amplifier | Sounds a menu item. I like it when a forum discusses a design. | Single Ended | 17.0 | 6J7, 2A3 |
| 164 | 2-Stage Amp with PCL86 | [From German] Another approach using tube similar to 6EM7 or 6BM8 (ie, driver and power in one dissimilar tube) | Single Ended | 17.0 | PCL86 |
| 165 | 6P3P Single Ended Amplifier | Nice stereo setup. This might be a good first-time project. | Single Ended | 17.0 | 12AT7,6P3P |
| 166 | Transformer Coupled Cathode Follower Driver Stage 6DRT - 300B SE | Hurray for Belgium! (Sorry, this is the first site I've seen from there.) | Single Ended | 17.0 | 6DRT, 300B |
| 167 | 50C5 Single Ended Triode Amplifier | Uses the tubes from the All American Five. Radios and Amps Unite! | Single Ended | 17.0 | 14GT8, 50C5 |
| 168 | 6C41 Preamp | The Netherlands. Schematic only. | Single Ended | 17.0 | D3a, 6N1P, 6C41B |
| 169 | A clock amplifier with the EL8 | [From German]. Approx. 1.75 Watts output | Single Ended | 17.0 | EF6, EL8 |
| 170 | 6F5P SET Amplifier | Lost of discussion of the effects of changing different parts. | Single Ended | 17.0 | 6F5P |
| 171 | 6V6 Amplifier | Schematic only. | Single Ended | 17.0 | 6J7, 6V6 |
| 172 | 2A3 Simple Amp | [In Vietnamese] Scroll down to post #100 | Single Ended | 17.0 | 12AT7, 2A3 |
| 173 | EL84 SE 'Siamese' by R. LeGrand | "A small little amp, with astounding musicality" | Single Ended | 17.0 | ECC81,EL84 |
| 174 | VT 52 Single-Ended SRPP | Inlcudes PCB, photos, oscilloscope output, etc. | Single Ended | 17.0 | ECC83, VT52 |
| 175 | 3 Watt SE Amplifier with 6BM8 Tube | Lots of helpful text for beginners. Tube is also ECL82. | Single Ended | 17.0 | 6BM8 |
| 176 | SE with Grundig AT3 transducers, KT88 Endröhren and EF800 | [From German]. Scheamtic link is at bottom of page. | Single Ended | 18.0 | KT1807, KT88 |
| 177 | 1626 Stereo Amp | Two watts, but 'drives speakers to ear-splitting volume'. Looks solid. | Single Ended | 18.0 | 6SN7,1626(2) |
| 178 | No.10 6rP22v2 (TOSIBA) SE STC V1 | Translated from the Japanese | Single Ended | 19.0 | 12AT7,6RP22 |
| 179 | ECL 82 Ultralinear SE amplifier | [From German]. Very compact and tidy. | Single Ended | 19.0 | ECL82 |
| 180 | "Cleo V": Voorversterker | In Dutch, I believe | Single Ended | 19.0 | AZ1,D3a,ECC88 |
| 181 | 2A3 Single Ended Amplifier | Those 2A3's can get expensive, though | Single Ended | 19.0 | 6U8(2),2A3 |
| 182 | 211 SE Amp - from tutorial | See the text discussion at http://tinpan.fortunecity.com/saints/668/primer/se.html | Single Ended | 19.0 | 6SN7 (2), 211 |
| 183 | 833 Tube Amp | See the 833 version, it's a hoot: http://www.tubelab.com/833SE.htm | Single Ended | 19.0 | 5842, 833 |
| 184 | 35A Amplifier | Schematic only. | Single Ended | 20.0 | 6J7, 35A |
| 185 | EL84/6BQ5 SE Stereo Tube Amplifier | Relatively common approach. Click on schematic to enlarge it. | Single Ended | 20.0 | ECC82, EL84 |
| 186 | Audio Amplifier for Compactron Tubes | Discussion of background | Single Ended | 20.0 | 12AE10 |
| 187 | Output Transformerless (OTL) Amp | [In Polish]. I like the schematic design. | Single Ended | 20.0 | ECL86 |
| 188 | 6L6 Amplifier | [In Vietnamese] Scroll half way down. | Single Ended | 20.0 | ECC81, 6L6 |
| 189 | 6L6 SE Amp | Schematic only. 3 Watts | Single Ended | 20.0 | ECC81, 6L6 |
| 190 | Russian Language Amplifier Schematic | [In Vietnamese] Scroll half way down page. Schematic is next to the picture of Kurt Cobain | Single Ended | 20.0 | 6SH32, 6H1P, GM70 |
| 191 | EL34 Single Ended Amplifier | [In German]. Click "Schaltbild" for schematic, "Bauteile" for parts list. 2x3 Watts. | Single Ended | 20.0 | 6SN7, EL34 |
| 192 | Simple Valve Amplifier with KT-88 | [From French]. KT-88 = 6550 | Single Ended | 20.0 | ECC808, KT88 |
| 193 | Power Amplifier | [From French]. Schematic Only. | Single Ended | 20.0 | 6AT6, 6AQ5 |
| 194 | Simple Stereo Amplifier with EL34 | [From French]. Project for engineering students; note the comparison with the Professor's model (further down the page) | Single Ended | 20.0 | ECC88, EL34 |
| 195 | "Attilla": Single ended 300BXLS versterker | In Dutch, I believe | Single Ended | 20.0 | D3a,27,300BXLS |
| 196 | 6550 Amplifier | Schematic only. | Single Ended | 21.0 | 6SN7, 6550 |
| 197 | KT88 Amplifier | Schematic only. | Single Ended | 21.0 | EF86, KT88 |
| 198 | ECL86 SE Amplifier | [From German]. Several pictures of different peoples versions. 4 Watts total. | Single Ended | 21.0 | ECL86 |
| 199 | Amplifier SYNOLA SE845 | [From German] I like his review of all the problems he encountered. | Single Ended | 21.0 | 6FQ7, 6SN7, 845 |
| 200 | "Goliath": Single ended 211 versterker | In Dutch, I believe | Single Ended | 21.0 | D3a,27,211 |
| 201 | Mr. Atarashi's Parafeed Amplifier | Author is critical of values and quality of components, "feedback helps, but what's lost is lost". | Single Ended | 21.0 | EF86, 6CA7, 845 |
| 202 | ECC83 / EL84 Amplifier | [In Polish]. I need to find an online translator for this. | Single Ended | 22.0 | ECC83, EL84 |
| 203 | Single Ended Tube Power Amplifier | Very throughout account of what he went through | Single Ended | 22.0 | 6SL7,6L6 |
| 204 | The new 300BXLS Single Ended Amplifier | From Italy. Quite impressive, even in the prototype stage | Single Ended | 22.0 | 6EM7, 300B |
| 205 | 845 SE Amplifier | Not sure if I got those tubes right. Also, the translation engine was having trouble with the French on the commentary page. | Single Ended | 23.0 | ECC83,EL93,845 |
| 206 | "Magique", a SE-project with aspirations | Wow, this is about as obsessive on parts and design as I've seen. 6 pages. | Single Ended | 23.0 | 4606,45 |
| 207 | Parallel single end with single-aperture core output transformers | [From German]. Cool looking, but I'm not sure I understand. 8 PL508 Endröhren and ECF80/E80F | Single Ended | 23.0 | ECF80, ECC82, PL508 |
| 208 | 4W Audio Amplifier | [In Russian]. Simple circuit found in a Russian forum. Scroll 1/3 way down page. | Single Ended | 23.0 | EF86, 6P1p |
| 209 | 838 SE Amp | [In German] Uses 6EM7 as driver tube. | Single Ended | 23.0 | 6EM7, 838 |
| 210 | 300B Amplifier | Looks heavy. | Single Ended | 23.0 | EF86,6CG7(2),300B |
| 211 | 6AS7 Amplifier | [In Vietnamese] Scroll 60% of way down page to Post #31. | Single Ended | 23.0 | 6BM8, 6AS7 |
| 212 | SE Audio Amplifer (English and Japanese) | On a Japanese site, in English. See http://www.geocities.jp/shoranosekai/EnglishVersion.html for main link page to internals and schematic. | Single Ended | 24.0 | 6AN8A, 45 |
| 213 | 6 Watt SE EL34 Amplifier | [In German]. Click "Schaltbild" for schematic, "Bauteile" for parts list. | Single Ended | 24.0 | 6SN7, EL34 |
| 214 | The Bugle Single 45 Amplifier | PDF File. From Sound Practices magazine | Single Ended | 24.0 | 6072, 45 |
| 215 | 6BQ5 Amplifier | Schematic only. | Single Ended | 25.0 | ECC81, 6BQ5 |
| 216 | AMPLI KT88 Psuedo Triode | [From French]. Several variations on this page. | Single Ended | 25.0 | ECL82, KT88 |
| 217 | Amplifier / Phonkoffer | [From German]. 2-stage amplifier for record player. | Single Ended | 25.0 | ECC83, EL84 |
| 218 | “Talk Devil” - Amp | [From German]. | Single Ended | 26.0 | ECC82, 4P1L |
| 219 | Single ended amplifier with the famous 300B tube | He really goes into detail on each of the parts. | Single Ended | 26.0 | 6SN7,300B |
| 220 | Endstufe mit ECL82 | [From German] The URL was too long to enter into my listing. | Single Ended | 28.0 | ECL82 (2) |
| 221 | "Nuance": 845 SE Mono Power Amplifier | From "Sound Practices", I think | Single Ended | 29.0 | 6072a,300B,845 |
| 222 | True Triode Amplifier with 300B | [From French]. Lot of colors and fonts on this page, that's for sure. | Single Ended | 30.0 | 6BM8, 300B |
| 223 | 845 SE Mono Power Amplifier | From Turkey. Article in Sournd Practices magazine. | Single Ended | 30.0 | 6072A,300B,845 |
| 224 | 10 Watt Stereo Amplifier using ECCL800 Tube | [From French]. Tube name in schematic is apparently a typo. | Single Ended | 32.0 | 6KH8 |
| 225 | Single Ended Amplifier, 6C41C, 2 x 6.5 Watts | [From German]. Has VU meters, tunings eyes, etc. | Single Ended | 32.0 | EC8010, 6SN7, 6C41, EM84 |
| 226 | 6B4 SE Amplifier | [From Japanese]. Schematic only. What's with all the capacitors? | Single Ended | 33.0 | 5687, 6B4 |
| 227 | 15W SE Power Amplifier with Two-Stage Driver. | From a Danish site (I think). Interesting things on this site, including kits. | Single Ended | 34.0 | 6SN7, 6J5, 6C33 |
| 228 | 6L6GC SE Amplifier | Interesting optional tone control, and comments on the inclusion of a Zobel network | Single Ended | 34.0 | 12AX7, 6L6GT |
| 229 | Single Ended 2 x 8 Watt Class "A" (KT88) | Uses push-pull 6SN7, then KT88. In German | Single Ended | 48.0 | 6SN7 (2), KT88 (2) |
| 230 | Audio Amplifier with transistor | [In Dutch] Schematic Only. | Single-Ended | 23.0 | 12AX7, 6V6 |
| 231 | DIY Plasma-Tweeter | Looks better than the other one. | Speaker | 13.0 | PLC619, PL32 |
| 232 | 6EM7 SE AUDIO AMP | This is a different approach to using the 6EM7 | SRPP + SE | 26.0 | 6SN7, 6EM7 |
| 233 | Building of 6BM8 amp | Interesting construction on a cookie can | STC | 13.0 | 6AK5, 6BM8(2) |
| 234 | Super Triode connection Circuit (STC) | Japanese site, but in English. Good information. "New circuit invented in the 90's" Is that true? "Stream of Era" paragraph is some of the best writing on the web. Period. And what's with the doubel transformer? | STC | 14.0 | 6BM8 |
| 235 | 6BM8 STC Amplifier | A Whole Lot of Theory on this very long page | STC | 15.0 | 6AK5,6BM8 |
| 236 | 6BM8 STC Amplifier | With discussion of circuit's theory | STC | 23.0 | 6AK5, 6BM8 |
| 237 | 6360 Amplifier | Translated from the Japanese | STC | 24.0 | 12AU7(2),6360 |
| 238 | Universal Amplifier to Test Popular Triodes | Interesting set-up allows playing with tubes and, it appears, capacitors | Test Bed | 20.0 | 12AU7 |
| 239 | Universal Amplifier to Test 211/VT-4C Type Tubes | Interesting set-up allows playing with tubes and, it appears, capacitors | Test Bed | 20.0 | 12AX7 |
| 240 | 50EH5 Amplifier | Chassis is an ashtray. And these heavy filaments essentially substitute for a power transformer | X | 6.0 | 50EH5 |
| 241 | "HI-FI" Audio Amp Using Only 3V | I'm not sure I understand this circuit; 50-100 MW | X | 7.0 | 1S4 |
| 242 | Stereo-Verstärker, vier mal PL504 | "Stereo Amplifier" With four more PL504 | X | 8.0 | PL504 (4) |
| 243 | 6C45Pi Amplifier | As good-looking as they come | x | 9.0 | 6C45,6C41 |
| 244 | Gegentaktverstärker mit vier EL95 | "Off-beat (?) Amplifier with EL95 | x | 9.0 | EL95 (2) |
| 245 | 6EM7 DC Coupled Triode Amp | Can the parts count get much smaller? Run direct off a CD. | x | 9.0 | 6EM7 |
| 246 | Stereo-Power mit Röhren | "Stereo Power with Tubes". Cool looking tubes. | X | 9.0 | SRS326 (2) |
| 247 | Zweistufiger NF-Verstärker | "Two-layered Amplifier" | x | 10.0 | EF95 |
| 248 | 6BM8 Amplifier | Schematic Only. | X | 10.0 | 6BM8 |
| 249 | "Darling" Amplifier With Lots of Examples | What a Great Page! Dozens of versions of a simple design! | X | 10.0 | 5965,1626 |
| 250 | Alfred P. Morgan 3-Tube Audio Amplifier | Basic two-stage audio amplifier | X | 12.0 | 12SQ7,35Z5,50C6 |
| 251 | A Single Ended Class A2 amplifier with the 4304CB | On what planet are these considered common tubes? | X | 12.0 | REN904,R120,4304CB |
| 252 | Röhren-Verstärker mit der ECC86 | "Tube Amplifier With the ECC86" | X | 12.0 | ECC86 |
| 253 | 1626 DARLING | 0.7 watts of output power. | X | 12.0 | 6N1P,1626 |
| 254 | 12GB7 Amplifier (Main page: http://homepage2.nifty.com/VT-12GB7/vamp/index.htm) | Translated from the Japanese | X | 12.0 | 12AX7,12GB7 |
| 255 | EC88 RC 2A3 Dual-Mono Intergated AMP | In Chinese or English; Interesting main site | x | 13.0 | EC88,2A3 |
| 256 | 2A3 Loftin-White | Translated from the Japanese | X | 14.0 | 12AX7,2A3 |
| 257 | Big Tube Amp | Now, that's a BEAST! I like the original approach to construction. | X | 14.0 | 437A,300B |
| 258 | *ANGELO* A simple two stage Amplifier | He talks about some issues with 2 stage amps (driver and final) | X | 14.0 | 6C45P,2A3 |
| 259 | 5965/2A3 Amplifier byh Stephen Chen | VERY Detailed construction photos. From the incredible linklist diysong.com | x | 14.0 | 5965,2A3 |
| 260 | 6B4G Integrated Mono | Um, where is te 6B4G? | X | 14.0 | 6C45,6C4C |
| 261 | 6SN7-2A3 power amplifier | The underside is as pretty as the top. | X | 14.0 | 6SN7,2A3 |
| 262 | ECL80 Amplifier | What is a "Verbundröhre"? | X | 14.0 | ECL80 |
| 263 | EF95 and 6Sh1P as NF amplifiers | I've got to learn those Russian tube numbering systems | X | 14.0 | 6Sh1P |
| 264 | 6S4 Micro Triode Amp | 1.25 Watts output. | x | 15.0 | 6N1P (2), 6S4A |
| 265 | 6AQ5 Amplifier | In Chinese (I think) | x | 15.0 | 12AT7,6AQ5 |
| 266 | RH 807 SE | Single Ended Amp with some discussion | X | 15.0 | ECC81,807 |
| 267 | 6AQ5 Amplifier | Preamp and power stage | X | 15.0 | 12AX7,6AQ5 |
| 268 | Single Tube audiophile amplifier | This is for a single channel. | X | 15.0 | ECL82 |
| 269 | Simple Power Amplifier | In Chinese or English; Interesting main site | x | 15.0 | 6C45PI,845 |
| 270 | 6AQ5 BSD Amplifier | I've been meaning to look up the meaning of BSD in this context | X | 16.0 | 12AX7,6FQ7,6AQ5 |
| 271 | "Five machine" 6CL6SE | Translated from the Japanese | X | 16.0 | 6GY6,12AT7,6L6 |
| 272 | 6BM8 super 3 amplifier | Include a FET. Page is translated from the Japanese, and some didn't convert. | X | 16.0 | 6BM8 |
| 273 | UZ42 Amplifier | Translated from the Japanese | X | 16.0 | 12AX7,6FQ7,42 |
| 274 | N3P Amplifier | "The Ñ3P is the Russian equivalent of the American 2C51 and 5670 - a double triode with middle slope and relatively high acceptable current load". Translated from the German. | X | 18.0 | N3P(2) |
| 275 | Mullard 3-Valve 3-Watt Amplifier | Mid-50's standard design, apparently. Change "1" at end of URL to 2, 3, 4, 5, 6 for other pages | X | 18.0 | EF86, EL84 |
| 276 | 6CL6 super 3 amplifier | Include a FET. Page is translated from the Japanese, and some didn't convert. | X | 18.0 | 12AT7,6CL6 |
| 277 | Five Tube Stereo Amplifier | 4 watts output max. per channel, 8 watts bridged | X | 19.0 | 6FS5,6K6 |
| 278 | EXPERIMENTS WITH PARAPHASE SPLITTERS (A Vacuum Tube "Multimedia" Amplifier) | Can use 6X8A's, which I seem to have a lot of. | x | 19.0 | 12AX7 (2), 6AQ5 (2) |
| 279 | 833 Ultra ParaFeed by R. de Vries | Check out the "factory floor". They said it took a week to construct these. | X | 19.0 | 6SN7(2),300B(2) |
| 280 | "Seven machine" 1619 super three | Translated from the Japanese | X | 19.0 | 6AK5,12AT7,1619 |
| 281 | Francesca 2000 - a 572-3 DHT Amplifier | An Italian page in English. (We appreciate the effort). "The best discovery I've recently made is the new 6c45 Tube. This little monster si able to dissipate 8w, has insignificant noise and 900ohm Rp (!)." | X | 20.0 | 6C45,2A3,572-3 |
| 282 | "Islander Construction" Audio Amplifier | This construction technique is "neat" | X | 20.0 | [-] |
| 283 | Audioverstärker mit der PCL86 | "Audio Amplifier with the PCL86" | x | 21.0 | PCL86 |
| 284 | HIFi Power Amplifier | English and Italian versions of page available. Design is from an Italian magazine called Nuova Elettronica. | X | 21.0 | ECC82,KT88 |
| 285 | 6AN5 amplifier | Translated from the Japanese | X | 22.0 | 12AT7,6AN5(2) |
| 286 | Pure Class A Amplifier | Is a photo working? | X | 22.0 | EF86,EL34,845 |
| 287 | Dual Triode Stereo Amplifier | Schematic only, but seems simple enough. | X | 22.0 | 12AX7 |
| 288 | STA-45 Stereo Amplifier | Looks like a kit, but they let you see the schematic as well as a photo | X | 22.0 | 12AU7,6BQ8 |
| 289 | Designing an Amplifier: Feedback Amplifier | Detailed design approach, charts, formulas, etc. | X | 24.0 | 12AX7, 12AU7, 6L6(2) |
| 290 | 845 20W A1 class monotriode amplifier | Two other projects lower on the page | X | 25.0 | 6SL7,300B,845 |
| 291 | 25L6GT Power Amplifier Without Power Transformer | Another one that operates directly off the AC line | X | 25.0 | 25L6GT(4),6SN7(2) |
| 292 | 6BM8 Line Operated Amp | Schematic Only | X | 25.0 | 6BF6, 6BM8 |
| 293 | Li'l 4x4 Tube Amplifier | Classic push-pull 35C5 design | X | 26.0 | 12AX7, 35C5(2) |
| 294 | 5W Audio Amplifier | See /sbench101 main site for discussion link | x | 29.0 | 1U4 (3),6AK6 (2) |
| 295 | Class A Amplifier, 5-7 Watts | This is an AX84 P1. See http://www.ax84.com/dp.php?pg=projects&project=p1 | x | 30.0 | EL34 |
| 296 | Dave Ewing's 300B Integrated stereo Amp | Nice looking. 50 Watts. | x | 30.0 | 6SL7,6SN7(2),6AG7,300B |
| 297 | Dave Ewing's 300B Integrated stereo amp | Note the table it's on: a candlestick and a quill pen! It evokes that 1800's, "world lit only by fire and a 300B" feeling. | X | 32.0 | 6SL7,6SN7(2),6AG7,300B |
| 298 | D. T. N. Williamson tube amplifier | Very extensive (10 pages) discussion of a classic circuit and the implications of its design ideas. | X | 33.0 | 6SN7(3),KT88(2) |
| 299 | HiFi mit Röhrengeräten (EL34) | Uses 6SN7 for preamplifier, it looks like (in German) | X | 34.0 | 6SN7 (2), EL34 (4) |
| 300 | The most complete do it yourself guide on the D. T. N. Williamson tube amplifier | Dissection of a classic tube-based audio amplifier | x | 34.0 | 6SN7 (2),KT66 (2) |
| 301 | Croft Series 5 valve power amplifier | Funny comment on the power arrangement | X | 34.0 | ECC83(2),EL84(4) |
| 302 | 6CM5 / EL36: Applications in Audio | Not sure about that middle tube. | X | 35.0 | 12AX7,5965(?),6CM5 |
| 303 | HiFi mit Röhrengeräten (ECL82) | HiFi with tubes. In German. Quite complete. | X | 37.0 | ECL82 (6) |
| 304 | 6AN8 & EL84/6BQ5 Project Amplifier | An experiment using a line transformer as an output transformer | X | 38.0 | 6AN8,6BQ5(2) |
| 305 | 45 46 300B Convertible Triode Amp | Read the attached article on the Bugle amplifier from which this design is taken. | x | 40.0 | 5751(2),45(2) |
| 306 | Air-Cored Transformer Amplifier | The output transformer is AIR CORED. Check out the picture; the thing must be 2 feet in diameter. | X | 58.0 | EL34(8),ECC82 |
| 307 | THE RADIO NEWS 1940 FULL-RANGE AMPLIFIER | Looks way over-engineered to me. | X | 60.0 | 6L7,6C5,6H6,6A3(2) |