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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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ClubPreampComp.jpg
ClubPreampComp.jpgMelbourne Audio Club preamp comparison night equipment6581 viewsFor the preamp comparison my 12AX7 Tube Preamp and OP Amp Preamp were used. My Gainclone monoblocks were used for the power amps. The speakers in the other image were built by a club member also. An A/B switch was used to switch from one preamp to the other under a blind test situation. This allowed a quick comparison between the two very different preamps. Though the chip preamp was voted the better (60/40) many still expressed their preference for the valve preamp.
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S-5-Electronics-K-12-Tube-Amp-Kit-2.jpgS-5 Electronics K-12 Tube Amp Kit6558 viewsFront view of K-12 Tube Amplifier Kit. The case is made of MDF and painted black with a high temperature resistant paint. Above the front On/Off switch is a blue LED. I also exchanged the volume knob with a black one from an old Yamaha subwoofer.
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6SN7-6L6-Tube-Amp-1.jpg6SN7 / 6L6 DIY Tube Amp6549 viewsThe 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. With a conservative rating of 20W per channel, measured frequency response is 10Hz to 40KHz with minimal square wave overshoot. I'm very pleased with how this unit sounds and looks.

Schematic Drawing: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
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S-5-Electronics-K-12-Tube-Amp-Kit-Board.jpgS-5 Electronics K-12 Tube Amp Kit - Circuit Board6547 viewsBottom view of my K-12 Tube Amp Kit. The fan is used to cool the power transformer which runs a little hot.
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Diaphony6.jpg"Diaphony's" An open baffle design6543 viewsConstruction
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Ion_DIY_2-Way_TMM_Tower_Speaker.jpgIon - DIY 2-Way TMM Tower Loudspeaker6509 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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DSCN0747.JPGK-16LS Customized Tube Amplifier Kit6506 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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reds.jpgDIY PVC Pipe Speakers with HiVi B3N driver6501 viewsThe speaker enclosures are made using various PVC pipe sections. The PVC pipe enclosure houses a 3-inch HiVi B3N fullrange driver. The enclosure is tuned through bass port at the end of the pipe stand. Binding posts are on the back. The frequency range is about 80 to 20,000Hz . There is a nice sound stage and pretty good low end response considering the small size of the driver and enclosure. I would love to hear your comments about this HiVi B3N Full Range Speaker project.
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071.JPGsaba open baffle speakers6499 viewsThe system so far. Project Debut III with acrylic platter and Speed Box II, Cambridge Audio 640P phono stage, DBX 223 XL active crossover, Decware SE84C+ set amp for the mid/high freq, Trends TA 10.1 for the low freq, endorphine P-17 open baffle speakers with emminance Delta 15A and SABA greencone oval with Grundig 4" used for tweeter until the SABA tweeter arrives.
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DIY-Three-Way-Tower-HiVi-Speakers.JPGDIY Three Way Tower HiVi Speakers6492 viewsDavid has completed a build of Adam's DIY 3-Way HiVi Tower Speaker Project. Each three-way tower loudspeakers uses one HiVi F8 woofer, two HiVi F5 mid-woofers and a HiVi RT1C-A Planar Isodynamic Tweeter. The speaker is the same as the original build with the exception that a HiVi Research RT1C-A tweeter is used in place of the HiVi SD1.1A tweeter.
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Hi-Vi-Research-Swans-Tempus-Speakers.JPGHi-Vi Research Swans Tempus Speakers6483 viewsHi-Vi Research Swans Tempus Bookshelf Speakers built by Daniel Bolduc. Bass frequencies are deep and clean while the highs are well balanced. But, due to either the limitation of the TN28 to 20 kHz or the crossover network, high frequencies are not as well defined and crisp as on the Hi-Vi 3-Way Tower Loudspeakers I built few months ago.

Here is an overview of Hi-Vi Research F6 / TN28 Swans Tempus Bookshelf Speakers with the enclosure plan. Also see my build log for more photos and construction details.
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mURI_temp_407ba9b9.jpgDIY Tower Loudspeakers6476 viewsThe empty front panel close-up !
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mURI_temp_83a855a8.jpgDIY Folded Horn Tower Speaker6473 viewsHere is a front close-up of the tower speakers !
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Jordan-JX92S-Bass-Reflex-Speakers.jpgSmall Bass Reflex Speakers with Jordan JX92S Drivers6468 viewsA pair of small vented (bass reflex) bookshelf speakers. A single Jordan JX92S fullrange driver is used per loudspeaker. The Jordan is much better than Fostex drivers at producing bass and it does not need an expensive tube amplifier.
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BrazCherry.jpgOrion DIY speakers6464 viewsThese dipole speakers are available as a DIY project, a kit, or completed speakers. You can purchase the plans from Siegfried Linkwitz (www.linkwitzlab.com).
The speakers use two 10" Peerless subwoofers, an 8" SEAS midrange driver and two SEAS Excel tweeters per cabinet. The active crossover circuit board is also available from Linqwitz Lab. The documentation includes all that is needed to build these yourself. For those who want some of the assembly completed, the crossover is available fully assembled and tested. A kit, unique parts and brackets for completing the construction, and completed speakers are also available. The speakers are driven with 8 channels of amplification (60 watts per channel). One can parallel the woofers to get by on 6 channels. There is much information on the web about the quality of these speakers. Anyone seeking very high quality speakers at a DIY price for music reproduction or for home theater will not be disappointed.
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S5-Electronics-K12G-Tube-Amp-Kit-Contents.jpgContents of S-5 Electronics K-12G Tube Amp Kit6429 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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Swans-Tempus-HiVi-3-Way-Tower-Speakers.jpgSwans Tempus and HiVi 3-Way Tower Speakers6419 viewsDIY Hi-Vi Research Swans Tempus Bookshelf Speakers sitting on Hi-Vi 3-Way Tower Loudspeakers that I built a few months back.

See Hi-Vi Research F6 / TN28 Swans Tempus Bookshelf Speakers for an overview and the speaker box plans. Also my build log has more photos and construction notes.
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Jordan-JX92S-Transmission-Line-Loudspeaker_.jpgJordan JX92S in Transmission Line Loudspeaker Enclosure6414 viewsJordan JX92S Fullrange Driver in a Transmission-Line Loudspeaker enclosure. The veneers is Yew Wood with a Tung Oil finish. The speaker box was constructed using 25 mm thick Baltic Birch plywood.

Related Project: DIY Jordan JX92S ML-TL Speaker
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Hi-Vi-Research-Swans-Tempus-Bookshelf-Speakers.JPGHi-Vi Research Swans Tempus Bookshelf Speakers6406 viewsRear view of the Hi-Vi Research Swans Tempus Bookshelf Speakers. I built two pairs of the Tempus and the cost was about $725/pair. I think that is a very fair price for speakers of that quality.

See Hi-Vi Research F6 / TN28 Swans Tempus Bookshelf Speakers for the speaker box enclosure plan. Also my build log has more information.
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Open-Baffle-Speaker-Ciare-CH250-Back.jpgOpen Baffle Speaker with Ciare CH250 - Rear6406 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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