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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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HiVi-SP10-Subwoofers.jpg
HiVi-SP10-Subwoofers.jpgHiVi SP10 Subwoofers6457 viewsA pair of subwoofers built by Daniel's following Adam's DIY HiVi SP10 Subwoofer Project. Full details of Daniel's build are available at his webpage.

In the background is are the DIY Hi-Vi 3-Way Tower Loudspeakers also built by Daniel.
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Seas-CA26RE4X-sealed-subwoofer.jpgSeas CA26RE4X 10-inch Sealed Subwoofer6420 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.
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Fostex-FX120-Fullrange-Bass-Reflex-Speaker.jpgFostex FX120 Recommended Bass Reflex Enclosure6408 viewsHere the Fostex FX120 fullrange driver is used in the Recommended bass Reflex Enclosure design provided by Fostex. See the Fostex Recommended Bass Reflex Type Enclosure Plans for the box dimensions.
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MicPreCct.JPGInside the diy microphone preamp6402 viewsThe cct. brd. for the ESP low noise two transistor mic preamp attaches to the lid of the this solid die-cast aluminum case. Batteries also are mounted on the cct. brd. This preamp is free from hiss and all noise and is the perfect partner for high quality low output mics. A more compact version could be constructed using electrolytic caps and AAA batteries (12V). But the quality would suffer a little with the inferior caps.
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Jordan-JX92S-Sealed-Speaker.jpgJordan JX92S in Sealed Speaker Box6392 viewsThe Jordan JX92S Fullrange transducer in a sealed (acoustic suspension) enclosure. The box volume is 5.2L and a camphor burl veneer was used for the finish. I use these with no baffle step correction whatsoever and are mated with an 8" subwoofer from av123.

I am thinking of adding the Aurum Cantis ribbon tweeter to these

Related Project: DIY Jordan JX92S Sealed Bookshelf Speakers
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K-12M-Tube-Amp-Test-Listen.jpgK-12M Tube Amp - First Listen6355 viewsThis is my first listen with a K-12M Tube Amp Kit. The source is a NAD C542 cd player, with 3 way 12" 92dB efficient speakers and Transparent 200 interconnect cables. A cool way to get into valve amps. I lost 1000 hours here!
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SV100843~0.JPGLundahl transformer step-up project for MM cartridge.6336 viewsI recently upgraded my Raga Planar 3 with a Grado wood bodied Platinum reference cartridge. But output was low from the Pro-Ject SE phono preamp. LL1550 trannies supplied by K & K Audio and printed circuit boards allowed me to build a step-up kit in the wooden box the Grado cartridge came in. Compact and beautiful! For more information, see DIY Lundahl MM Phono Step-Up Transformers.
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FinishedInide.JPGOP Amp Preamp - inside the case6309 viewsOn the test bench for a short run-in period. The lids off waiting for smoke. No smoke but on the first start there was a minor fault. I have been listening to the preamp for two hours now and found it adds nothing to the sound (as a preamp should) and extends control with volume and balance adjustment. The yellow caps are 0.47 uF polypropylene metal film. Full details are available for this project at: DIY Op Amp based Preamplifier Project.
S-5-Electronics-K-12G-Tube-Amp-Kit-rear.jpg
S-5-Electronics-K-12G-Tube-Amp-Kit-rear.jpgS-5 Electronics K-12G Tube Amp Kit - rear view6289 viewsRear view of DIY enclosure for a S-5 Electronics K-12G Tube Amp Kit.
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2_with_bigger_brother.jpgDIY Phono Preamp, Valve Preamp and Chipamp Monoblocks6268 viewsThis image shows the degree to which Paul has gone with an all DIY audio set-up. You can see all three main components. Also Paul made some Silver Highway, pure silver and heat-shrink interconnect cables. The Valve preamp (larger silver front enclosure) and Chip amp monoblocks are earlier builds of mine. He is also using OB speakers I built which have had serious Xover upgrades and also a sub-woofer of mine to compliment the OBs. This combo produces a phenomenal sounds stage image with exceptional detail and clarity.
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dsc_0987.jpgDIY Open Baffle Speakers6262 viewsRemoving the most detrimental factor to sound quality - The Box!

Tweeters: 4x Hivi K1
Midrange: Seas L21 RNXP
Woofers: Jaycar CW2119
K-12-Tube-Amp-Kit-with-Enclosure.jpg
K-12-Tube-Amp-Kit-with-Enclosure.jpgK-12G Tube Amplifier Kit with "G" Series Case6261 viewsFinished build of a S5 Electronics K-12G Tube Amplifier kit by Rudi Slejkovec in Slovenia. The enclosure is a "G" series case which is also available from the manufacturer.
Fostex-FE206E-Double-Bass-Reflex-Speaker-Enclosure.jpg
Fostex-FE206E-Double-Bass-Reflex-Speaker-Enclosure.jpgFostex FE206E in Double Bass Reflex Speaker Enclosure6259 viewsThis is the simpler enclosure recommended by Fostex for their high sensitivity FE206E drivers. The large magnet and basket spokes of the driver have been covered with bituminous damping. The upper chamber has sound deadening vinyl across the back and the rest of the upper chamber has double layers of thick Dacron lining it. The boxes are fastened using dowels, glue and wood screws. A Speaker Zobel / Impedance Equalization Circuit is used across the driver terminals. The sound soundstage is pin-point sharp and with good depth. Bass is sufficient without being heavy. For under $AU500 these speakers represent very good value. With a sensitivity of 96 dB/W my 6 W Ultra-Linear Single-Ended valve amps can produce a high sound level.

For full details see the Fostex FE206En Double Bass-Reflex Speaker project page.
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Diaphony8~0.jpg"Diaphony's" An open baffle design6259 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.
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IMG_3234.JPGK-12G tube amplifier kit - finished6250 viewsBuilt the S-5 Electronics K-12G tube amplifier kit into an old Kenwood amplifier case. Finished product.
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K-12M-Tube-Amp-Kit-Rear.jpgK-12M Tube Amp Kit6243 viewsThis is a rear view of my K-12M Tube Amp Kit which shows the gold RCA inputs and speaker binding posts.
Jordan-JX92S-Transmission-Line-Speakers.jpg
Jordan-JX92S-Transmission-Line-Speakers.jpgJordan JX92S Transmission Line Speakers6241 viewsPair of Jordan JX92S fullrange drivers in a solid oak loudspeaker enclosure. The enclosure is the MLTL 48 transmission line design with a slightly smaller cross-sectional area. More details and pictures are available at my site.
6SN7-6L6-Tube-Amp-2.jpg
6SN7-6L6-Tube-Amp-2.jpg6SN7-6L6 DIY Tube Amplifier6194 viewsThis amplifier uses a Williamson front end and phase splitter, with an ultralinear output stage. The valve lineup for each channel is a 6SN7 as first amplifier and phase splitter, followed by another 6SN7 driving a pair of 6L6s. Bias is set by active semiconductor current sinks. The 400V HT is generated by a double anode diode (5R4) driving a choke input filter. The audio output transformers are Hammond Manufacturing 1620s. Conservative rating of 20W per channel.

Schematic: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
DIY-HiVi-SP10-Subwoofer.jpg
DIY-HiVi-SP10-Subwoofer.jpgDIY HiVi SP10 Subwoofer6194 viewsDIY subwoofer using the HiVi SP10 10" driver in a vented (bass reflex) enclosure. A O-Audio 500 Watt plate amplifier was used. See the DIY HiVi SP10 Subwoofer Project page for full details.
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Tang-Band-D4-1-DIY-Back-Horn-Speaker-Kit.jpgTang Band D4-1 DIY Back Horn Speaker Kit6189 viewsThe fun and simple Tang Band D4-1 DIY Back Horn Speaker Kit. This little speaker kit comes complete with all the parts and tools required (minus a soldering iron). There is no cutting or finishing required (no saw dust or fumes!). The kit is very simple to build as it goes together just like ready-to-assemble furniture.

For a full review of this speaker kit, see: Tang Band D4-1 DIY Back Horn Speaker Kit.
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