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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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DSCN0747.JPGK-16LS Customized Tube Amplifier Kit5885 viewsUpgraded stock capacitors to Dayton Audios and Ruby Golds with filtering caps bottom mounted. Transformers rotated and side mounted to reduce noise, along with quad-star, shielded signal cables.
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K-12M-Tube-Amp-Test-Listen.jpgK-12M Tube Amp - First Listen5872 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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Copper_Steampunk_K-12GTube_Amplifier_Kit_2.jpgCopper Steampunk K-12G Tube Amp Kit - Rear5862 viewsThis is a K-12G tube amplifier kit that I built into a steampunk-ish enclosure. Had a blast with this one, and I'm amazed at the amount of wonderful sound that this little tube amp kit puts out!

I'll be posting construction photos on my blog site if you're interested in taking a look: www.coppersteam.com

Mike Cochran
Key West, USA
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SV100843~0.JPGLundahl transformer step-up project for MM cartridge.5861 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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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.
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Feastrex-NF-5-Bass-Reflex-Enclosure.jpgFeastrex NF-5 Bass Reflex Speakers5856 viewsThe lovely Feastrex NF-5 fullrange drivers on display at the 2011 Salon Son & Image show. The single fullrange drivers were housed in a bass reflex enclosure and driven by a Mastersound Compact 845 SET amp.

See the Feastrex NF-5 and NF-5ex Drivers SSI 2011 report for more details.
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Ion_DIY_2-Way_TMM_Tower_Speaker.jpgIon - DIY 2-Way TMM Tower Loudspeaker5850 viewsThe Ion tower loudspeaker project is Adam's latest diy speaker project. The Ion is a 2-way speaker in a TMM configuration. A Tang Band 25-1372SC 1" inverted titanium dome tweeter is used along with a pair of Audax HM170CO 6" woven carbon fiber woofers.

The Ion speaker project will be a very challenging build but Adam notes that it comes with a huge payoff! The Ion tower speakers have quickly become Adam's favorite loudspeakers.

For the full project details, see the Ion - DIY 2-Way TMM Tower Speaker Project.
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Jordan-JX92S-Transmission-Line-Speakers.jpgJordan JX92S Transmission Line Speakers5845 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.
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DIY-HiVi-SP10-Subwoofer.jpgDIY HiVi SP10 Subwoofer5805 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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dsc_0987.jpgDIY Open Baffle Speakers5805 viewsRemoving the most detrimental factor to sound quality - The Box!

Tweeters: 4x Hivi K1
Midrange: Seas L21 RNXP
Woofers: Jaycar CW2119
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LM3875-Gainclone-Breadboard.jpgLM3875 Gainclone on Breadboard5802 viewsLM3875 Gainclone. The circuit is the same as Mark's LM3875 Gainclone. Most of the parts are from Dick Smith which can also be found at Radio Shack.
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Jean-Hiraga-Super-Class-A-Amp.jpg58W Jean Hiraga Super Class-A Amplifier5802 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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S5-Electronics-K12G-Tube-Amp-Kit-Contents.jpgContents of S-5 Electronics K-12G Tube Amp Kit5799 viewsThese are the contents of the recent run (Feb 2009) of S-5 Electronics K-12G Tube Amplifier Kits. The power transformer supplied with the K-12G kit seems to be slightly larger than those which were supplied with the S-5 Electronics K-12M Tube Amplifier Kits.
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6SN7-6L6-Tube-Amp-2.jpg6SN7-6L6 DIY Tube Amplifier5777 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
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Fostex-FE206E-Double-Bass-Reflex-Speaker-Enclosure.jpgFostex FE206E in Double Bass Reflex Speaker Enclosure5772 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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S-5-Electronics-K-12G-Tube-Amp-Kit-rear.jpgS-5 Electronics K-12G Tube Amp Kit - rear view5768 viewsRear view of DIY enclosure for a S-5 Electronics K-12G Tube Amp Kit.
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Open-Baffle-Speaker-Ciare-CH250-Back.jpgOpen Baffle Speaker with Ciare CH250 - Rear5763 viewsRear view of the Ciare CH250 full range driver in a simple open baffle panel. The plans are the Open Baffle Plans from Stereo Sound "Tube Kingdom".

See my blog for more information - Open Baffle mit Ciare CH250.

Carsten (Germany)
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K-12M-Tube-Amp-Kit-Rear.jpgK-12M Tube Amp Kit5754 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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SV101783.JPGOpen Baffle Speakers - Front5744 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.
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Jordan-JX92S-Transmission-Line-Loudspeakers.jpgJordan JX92S Transmission Line Loudspeakers5724 viewsThe Jordan JX92S fullrange drivers in solid oak MLTL cabinets. These sound great. See my site for more details.
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