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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 Subwoofers6380 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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MicPreCct.JPGInside the diy microphone preamp6350 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.
Fostex-FX120-Fullrange-Bass-Reflex-Speaker.jpg
Fostex-FX120-Fullrange-Bass-Reflex-Speaker.jpgFostex FX120 Recommended Bass Reflex Enclosure6348 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.
Jordan-JX92S-Sealed-Speaker.jpg
Jordan-JX92S-Sealed-Speaker.jpgJordan JX92S in Sealed Speaker Box6334 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
Seas-CA26RE4X-sealed-subwoofer.jpg
Seas-CA26RE4X-sealed-subwoofer.jpgSeas CA26RE4X 10-inch Sealed Subwoofer6334 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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K-12M-Tube-Amp-Test-Listen.jpgK-12M Tube Amp - First Listen6281 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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FinishedInide.JPGOP Amp Preamp - inside the case6275 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.
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SV100843~0.JPGLundahl transformer step-up project for MM cartridge.6263 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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2_with_bigger_brother.jpgDIY Phono Preamp, Valve Preamp and Chipamp Monoblocks6218 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.
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 view6199 viewsRear view of DIY enclosure for a S-5 Electronics K-12G Tube Amp Kit.
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dsc_0987.jpgDIY Open Baffle Speakers6193 viewsRemoving the most detrimental factor to sound quality - The Box!

Tweeters: 4x Hivi K1
Midrange: Seas L21 RNXP
Woofers: Jaycar CW2119
Fostex-FE206E-Double-Bass-Reflex-Speaker-Enclosure.jpg
Fostex-FE206E-Double-Bass-Reflex-Speaker-Enclosure.jpgFostex FE206E in Double Bass Reflex Speaker Enclosure6189 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.
Jordan-JX92S-Transmission-Line-Speakers.jpg
Jordan-JX92S-Transmission-Line-Speakers.jpgJordan JX92S Transmission Line Speakers6186 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.
K-12M-Tube-Amp-Kit-Rear.jpg
K-12M-Tube-Amp-Kit-Rear.jpgK-12M Tube Amp Kit6173 viewsThis is a rear view of my K-12M Tube Amp Kit which shows the gold RCA inputs and speaker binding posts.
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Diaphony8~0.jpg"Diaphony's" An open baffle design6148 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.
DIY-HiVi-SP10-Subwoofer.jpg
DIY-HiVi-SP10-Subwoofer.jpgDIY HiVi SP10 Subwoofer6147 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.
6SN7-6L6-Tube-Amp-2.jpg
6SN7-6L6-Tube-Amp-2.jpg6SN7-6L6 DIY Tube Amplifier6143 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
K-12-Tube-Amp-Kit-with-Enclosure.jpg
K-12-Tube-Amp-Kit-with-Enclosure.jpgK-12G Tube Amplifier Kit with "G" Series Case6140 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.
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SV101783.JPGOpen Baffle Speakers - Front6135 viewsI had a very large sheet of 18mm particle board which had been sitting around for years. Also a pair of titanium domed tweeters and 2" domed mid-range surplus. What to do with them? With the addition of a pair of cheap but very robust 10" woofers and a 2nd order Xover (600Hz & 3.5kHz) I thought a may knock-up a pair of OBs.

I allowed one day to build these from scratch and with the assistance of some massive angle brackets and a few meters of darcon here is the result. That total height and depth of the speakers is covered in two thick layers of darcon leaving only the woofer rears bare.

The woofers are stiff and require many hours of play to get them to full performance. But the speakers have an excellent sound stage bright mids and highs. Bass is OK but not deep.
Jean-Hiraga-Super-Class-A-Amp.jpg
Jean-Hiraga-Super-Class-A-Amp.jpg58W Jean Hiraga Super Class-A Amplifier6131 views58W version of the Jean Hiraga "Super Class-A 30W" Amplifier. This version uses a higher rail voltage and Toshiba 2SA1943 and 2SC5200 transistors. For full details, see the Jean Hiraga's Super Class-A Amplifier Project page.
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