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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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S-5-Electronics-K-12-Tube-Amp-Kit-2.jpg
S-5-Electronics-K-12-Tube-Amp-Kit-2.jpgS-5 Electronics K-12 Tube Amp Kit6035 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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Hi-Vi-Research-Swans-Tempus-Speakers.JPGHi-Vi Research Swans Tempus Speakers6017 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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S-5-Electronics-K-12-Tube-Amp-Kit-Board.jpgS-5 Electronics K-12 Tube Amp Kit - Circuit Board6013 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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Jordan-JX92S-Transmission-Line-Loudspeaker_.jpgJordan JX92S in Transmission Line Loudspeaker Enclosure5996 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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reds.jpgDIY PVC Pipe Speakers with HiVi B3N driver5973 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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MicPreCct.JPGInside the diy microphone preamp5967 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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DIY-Three-Way-Tower-HiVi-Speakers.JPGDIY Three Way Tower HiVi Speakers5966 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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BrazCherry.jpgOrion DIY speakers5962 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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Swans-Tempus-HiVi-3-Way-Tower-Speakers.jpgSwans Tempus and HiVi 3-Way Tower Speakers5957 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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FinishedInide.JPGOP Amp Preamp - inside the case5948 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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Fostex-FX120-Fullrange-Bass-Reflex-Speaker.jpgFostex FX120 Recommended Bass Reflex Enclosure5927 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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Diaphony4.jpg"Diaphony's" An open baffle design5926 viewsConstruction
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Hi-Vi-Research-Swans-Tempus-Bookshelf-Speakers.JPGHi-Vi Research Swans Tempus Bookshelf Speakers5924 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.
Jordan-JX92S-Sealed-Speaker.jpg
Jordan-JX92S-Sealed-Speaker.jpgJordan JX92S in Sealed Speaker Box5909 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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HiVi-SP10-Subwoofers.jpgHiVi SP10 Subwoofers5906 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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Freds-Place-SAR-Labs-STA80.jpgListening Session at Fred's Place - April 20105904 viewsPhoto of the listening session over at Fred's place in April 2010. Components shown in the photo are:
SAR Labs STA80 KT88 Tube Amp with JJ KT88 Blue Glass tubes (top left)

OddWatt Audio DIY KT88 Push-Pull Monoblock Tube Amp Kits with Gold Lion KT88 tubes (bottom middle) put together by Gio.

The small speakers are from a Tang Band D4-1 DIY Back Horn Speaker Kit put together by Gio.

And the large Fostex FF85K Eminence Alpha 15A Open Baffle Speaker were built by Keith.
Diaphony6.jpg
Diaphony6.jpg"Diaphony's" An open baffle design5829 viewsConstruction
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2_with_bigger_brother.jpgDIY Phono Preamp, Valve Preamp and Chipamp Monoblocks5815 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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Jordan-JX92S-Transmission-Line-Speakers.jpgJordan JX92S Transmission Line Speakers5784 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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SV100843~0.JPGLundahl transformer step-up project for MM cartridge.5771 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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