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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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DSCN0084s.jpgSE RCA 2A3 Triode Tube Amp2132 viewsMy favorite class-A single-ended (SE) tube amplifier an RCA 2A3 triode driven by a Phillips E180F pentode. The audio output transformers are Hammond 125 FSE.

The power is external in the black box on the right side. 2x4 w and consists of Black Gate and Rubycon capacitors. Resistors carbon
film and Mills. Autobias. Interstage transformers
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RFTUBES.jpgRF tubes in audio use1842 viewsThe use of RF tubes in audio amplifiers may be a good option and saves some money. Here you have the descriptions of some experiments done in this field. For details see http://diy-rbt5.tripod.com/
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amp_5881.jpgStereo Tube Amplifier with 5881 or 6L6 tubes1996 viewsStereo tube amplifier for either 5881 or 6L6 type vacuum tubes. The amplifier is class A and single ended. For more details about this tube amplifier see: http:/diy-rbt4.tripod.com/ (Portuguese)
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F2.jpgTube amplifier for guitar and music listening2255 viewsDIY tube amp for guitar and music. 12AT7 input tube and singled ended EL34 output tube. Power output is about 10 Watts.

For more details about this tube amplifier see: http://sites.google.com/site/diyrbt6/ (Portuguese)
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PhonoTubePreampMkIIFrontS.jpgOatley Electronics K282 - JAN 6418 tube phono preamp kit1846 viewsFront view of my second Oatley JAN6418 tube phono preamp kit build. I call this one the Special Edition version. It uses an external solid state power supply instead of the two SMPS that come with the phono preamp kit.

See my review of the 6418 Tube (Valve) RIAA Phono Preamplifier Kit for full details.
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PhonoTubePreampMkIIInsideS.jpgOatley Electronics K282 JAN 6418 valve phono preamp2083 viewsMy second build of the Oatley Electronics JAN 6418 valve phono preamp kit. This time no switch mode power supply and metal film resistors and better polypropylene capacitors replace the basic kit components.

For details about the upgrades I made to the basic kit, see my review of the 6418 Tube (Valve) RIAA Phono Preamplifier Kit.
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Tube-Amp.jpgSV811-10 single-ended tube amp.2277 viewsRussian Svetlana SV811-10 Single Ended Monoblock tube amp.
Circuit by Eric Barbour.
See it on YouTube. @closin99
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Amp1.jpgPush-Pull 6P3S-E & 6N2P (OddWatt)2552 viewsUL, cl.A /Ia=51 mA for each 6P3S-E tube. Schematic follows the idea of the KT88 push-pull Oddwatt design. /thanks Bruce/. Audio Output transformers are Hammond 1650, with triode and UL modes and output for 8 and 4 ohms, rated "HiFi" bandwith 20-20000Hz +/ - 0 dB!!
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OatleyPhonoPreFinisS.jpgMongrel Dog Audio JAN6418 tube phono preamp2100 viewsThis is a new tube phono preamp kit from Oatley Electronics based around the JAN 6418 sub-miniature pentode tubes. The phono preamp kit has been housed in a cast aluminum enclosure with a Hammered Copper finish. Inside the enclosure bitumanised aluminum foil lines the lid and top. Gold RCAs grace the back. The sound reproduction is full bodied with deep bass, bright mids and highs. This phono preamp may out perform my OPAMP unit.

There are more details about my experience with this inexpensive little phono preamp amp kit on the 6418 Tube RIAA Stereo Phono Preamplifier Kit project page.

Mark Houston
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OatleyPhonoPreInsideS.jpgMongrel Dog Audio JAN6 418 valve phono preamp2688 viewsThis is the new tube phono preamp kit for MM cartridges from Oatley Electronics. The small tube preamp kit comes with all components required, including NOS JAN 6418 sub-miniature tubes and a wall wart for the switch mode power supply. The wall wart PS has multi-outlet adapters to fit most mains power outlets worldwide. The PS auto-switches to the correct mains voltage to provide 5V DC to the kit. There are two tube stages with each stage supporting a FET buffer to the next. The PCB is plated through and screen printed.

See the 6418 Tube RIAA Stereo Phono Preamplifier Kit project page for more details and a review of this kit.

Mark Houston
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Dons6C33C.jpgDon's 6C33C tube amp from Down Under with locally wound OPTs3226 viewsThis beautiful 6c33c amp is not one of mine but belongs to a regular customer of the electronics store I work at. The power tubes are the same used in Mig fighter jets as regulator tubes. Don has dropped one on a wooden floor, it bounced and he caught it. Tough tubes. The timber base is made by Don and the top plate is 4mm thick ABS plastic. The power transformers and chokes are well separated from the music making bits. He employed locally made horizontal power transformer, chokes and audio OPTs. The amp is musical and neutral sounding low bass is a little spongy and undefined when added to my all valve system. It produces 15W, not bad from a SET. The front tube is a Sovtek 6SJ7 and the amp is two stage and weighs 40lb! Mark – contributor.

See this 6c33c tube amplifier thread for more info about this tube.
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PB220014.JPGPCL86 Single-Ended Amplifier3796 viewsSingle-ended amplifier using PCL86 triode / pentode tube

web: http://www.bartech.rulz.hu/
e-mail: kisskozsa@freemail.hu
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6L6-5881-SE-Valve-Amp.jpgSingle-Ended (SE) 6L6 / 6L6GC / 5881 Valve Amp3369 views6SJ7 or 6SD7 (pentode) driver stage. 6L6 or 5881 output stage (Sovtek 5881WXT shown). Solid state power supply, DC heaters.

OPT covers are made from copper clad board and enclosure is aluminum.

See the DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier project page for more information.
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6L6-5881-SE-Tube-Amp.jpgSingle-Ended (SE) 6L6 / 6L6GC / 5881 Tube Amp4075 viewsCutoff pentodes (6SJ7 or 6SD7) are used to drive 6L6 or 5881 output tubes. Tungsram 6SJ7 and Sovtek 5881WXT tubes are shown in the photo. The power supply is solid state and DC is used on the tube heaters.

The OPT covers are made from copper clad board and the enclosure is all aluminum and hand made.

See the DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier project page for more information.
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2120128885_d5fb1fe01d_b.jpgRetro tube amp Telefunken EL11 & EF12 + Tungsram AZ113053 viewsNice sound from years before word war II of 20th century.

see the forum: My "Retro" tube amplifier (EL11, EF14, AZ11) for more information.


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DIY-6V6-Push-Pull-Tube-Amplifier.jpgDIY 6V6 Push-Pull Tube Amplifier2978 views6V6 push-pull tube amp with Hammond 1608A audio output transformers. 6SL7 input and GZ34 rectifier. See the DIY Push-Pull (PP) 6V6 Tube Amplifier Schematic for full details.
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KT88-Monoblock-Tube-Amplifiers.jpgDIY Monoblock KT88 Push-Pull Tube Amplifier Kits2500 viewsShown in the photograph are a pair of DIY Monoblock KT88 Push-Pull Tube Amplifier Kits. See the review for additional details of this great sounding tube amp kit. Also shown in the photo is a NAD C521i CDP used a transport and a Behringer SRC2496 which is being used as an up-converting DAC. The little black box is a DIY Lightspeed (optocoupler) Attenuator.
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MongrelChamp.jpgFender Champ 5F1 valve guitar amp.2674 viewsMy build of the Fender Champ 5F1. It is a SE three stage tube amp based on the 6V6 power valve and 12AX7 triode. The amps were first made in the late 40's up to early 80's. And re-issued in 2006. The original schematic had valve rectification. I added a 10H open choke. There are only two inter-stage caps and one by-pass cap on the 6V6 cathode resistor (not counting PS caps). I went for a Classic Champ sound by using cotton covered, single core, tinned copper wire as the hook-up wire, bees wax (Jupiter originals) inter-stage caps, an original Ozzie made 12AX7, Ozzie 5Y3 and 6V6 Black Glass (original). PS caps were increased from 8uf to 47uf and an effects loop added (between stage one and stage two). I didn't install the NFB loop from the OPT secondary to stage two. Instead I made the output stage UL (Edcor tranny). The amp is stable even when over-driven heavily. When hooked-up to a Pioneer PA 12" driver (4" Al/vented dust cover) it sounds excellent. Very clean highs and gutsy lows.
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DSCN0061_M1~2.jpgMy Black Velvet OTL headphones amplifier 2638 views6AS7G RCA & Rare RV200/600 Tungsram-Germany & PCC88 Siemens /golden pins/
OTL for headphones 200 and more ohms. Loftin-white, only 1 cap ELNA between output stage and headphones.
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DIY-Vacuum-Tube-Prototype-Bread-Board.jpgDIY Vacuum Tube (Valve) Prototyping Bread Board3596 viewsA simple DIY Vacuum Tube (Valve) Prototyping Test Board used to test single stage tube circuits.

See the DIY Vacuum Tube Prototyping Board post for additional details.
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