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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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Diaphony2.jpg
Diaphony2.jpg"Diaphony's" An open baffle design6522 viewsConstruction with waive guide prior to final rough finish.Apr 26, 2010
Diapony_sandOrion.jpg
Diapony_sandOrion.jpgDiaphony' and Orion5538 views04/2010 Northern California DIY Audio meetApr 26, 2010
Diaphony7.jpg
Diaphony7.jpg"Diaphony's" An open baffle design5248 viewsConstructionApr 26, 2010
Diaphony6.jpg
Diaphony6.jpg"Diaphony's" An open baffle design5945 viewsConstructionApr 26, 2010
Diaphony4.jpg
Diaphony4.jpg"Diaphony's" An open baffle design6041 viewsConstructionApr 26, 2010
Diaphony3.jpg
Diaphony3.jpg"Diaphony's" An open baffle design5242 viewsConstructionApr 26, 2010
Diaphony8~0.jpg
Diaphony8~0.jpg"Diaphony's" An open baffle design5582 views"Diaphonys". A Dipole with a 10" separation between cabinets (21”w *18”h*6”upper cab) to direct reflected waves to the listener. Low distortion driver choices with a SB Acoustics 29RDC-0004 for highs, Usher Audio 8945A for mids, and an Eminence Alpha15A for lows (lower cab same as the upper but extened to 12” depth). These drivers work together nicely together with a 2nd order LR with the low end of the Usher rolling off naturally. Upper cab with a 8" cardboard tube to direct waves from the Usher from the back of the 6" wide speaker box depth to the reflected surface with minimal re-reflection to the back of the driver. I used a 6" diameter plywood rounded baffle ends to reduce diffraction losses and to improve off axis response. Claity SA Caps where important, Solen Fast Caps else where. Goertz inductors with Madisound Sledgehammer for the Alpha 15A. Balic Birch construction with Walnut veneer. The sound? I knew immediately when the SB and Usher were on just a 22" wide by 60" tall board I had made good choices. The cleanest mid I have ever heard. I'm sure there are better ones, but not by much. Voices that were unintelligible on other systems of recordings I know well became understandable - embarrassingly so. A wood block sounds like a real live wood block. I primarily used various tracks off Tania Libertad’s album “Costa Negra and Pacifika’s “Asuncion” for listening tests and crossover tweaking – two extremely well tracked and mastered albums to say nothing of the voices and talent. While listening to track 12 of Libertad’s album “Yo Venco A Ofrecer Mi Corazon”, in my listening area, it becomes to difficult point to speaker placement without visual cues. The Diaphony’s are large, they do need to be about 4 feet away from a back and side wall seem to be the only distracters. Many compliments at the recent Northern California DIY Audio meet outside of Sacrameno, CA.Apr 26, 2010
DSCN0084s.jpg
DSCN0084s.jpgSE RCA 2A3 Triode Tube Amp2338 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
Apr 22, 2010
DIY-HiVi-Swans-M1-Speakers.jpg
DIY-HiVi-Swans-M1-Speakers.jpgDIY Swans M1 Speakers - HiVi Research5295 viewsDIY build of the Swans M1 Speakers from HiVi Research.

See DIY HiVi Research Swans M1 Speakers
Apr 16, 2010
RFTUBES.jpg
RFTUBES.jpgRF tubes in audio use2035 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/Apr 13, 2010
12AU7-IRF510-LM317-Headphone-Amp.jpg
12AU7-IRF510-LM317-Headphone-Amp.jpg12AU7 Tube / IRF510 MOSFET Headphone Amp3997 viewsSimple headphone amplifier with a 12AU7 (ECC82) tube voltage gain stage and a IRF510 MOSFET follower stage. A 12V SLA battery is used for the power supply. A LM317 regulator is used as a CCS to bias the MOSFET into class-A operation.

See the project page: 12AU7 (ECC82) Tube / IRF510 MOSFET Headphone Amplifier
Apr 12, 2010
Seas-CA26RE4X-sealed-subwoofer.jpg
Seas-CA26RE4X-sealed-subwoofer.jpgSeas CA26RE4X 10-inch Sealed Subwoofer5861 viewsSeas CA26RE4X 10" subwoofer in a sealed 1.27 cubic ft cabinet. I used 3/4" maple plywood with mitered, biscuit-joined seams. The driver port was cut, then the lip routed, then scabs glued in with Gorilla Glue, then drilled and fitted with threaded caps. The rear panel was sealed with strips cut from a bicycle innertube as gasket material. Originally wanted to stain black black, but I think the natural wood grain really looks good.
Mark A.
Apr 11, 2010
amp_5881.jpg
amp_5881.jpgStereo Tube Amplifier with 5881 or 6L6 tubes2201 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)Apr 10, 2010
F2.jpg
F2.jpgTube amplifier for guitar and music listening2466 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)
Apr 08, 2010
PhonoTubePreampMkIIFrontS.jpg
PhonoTubePreampMkIIFrontS.jpgOatley Electronics K282 - JAN 6418 tube phono preamp kit2036 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.
Apr 07, 2010
PhonoTubePreampMkIIInsideS.jpg
PhonoTubePreampMkIIInsideS.jpgOatley Electronics K282 JAN 6418 valve phono preamp2278 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.
Apr 07, 2010
Tube-Amp.jpg
Tube-Amp.jpgSV811-10 single-ended tube amp.2498 viewsRussian Svetlana SV811-10 Single Ended Monoblock tube amp.
Circuit by Eric Barbour.
See it on YouTube. @closin99
Apr 03, 2010
Amp1.jpg
Amp1.jpgPush-Pull 6P3S-E & 6N2P (OddWatt)2792 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!!Mar 31, 2010
OatleyPhonoPreFinisS.jpg
OatleyPhonoPreFinisS.jpgMongrel Dog Audio JAN6418 tube phono preamp2291 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
Mar 23, 2010
OatleyPhonoPreInsideS.jpg
OatleyPhonoPreInsideS.jpgMongrel Dog Audio JAN6 418 valve phono preamp2930 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
Mar 23, 2010
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