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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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Realistic-Minimus77-Speakers-AlMg-Driver.jpg
Realistic-Minimus77-Speakers-AlMg-Driver.jpgHiVi BN4 Anodised Aluminium / Magnesium Midbass Drivers7197 viewsThe drivers in these metal enclosure Tandy / Realistic / Radio Shack Minimus 77 speakers, had been burnt out when a chip amp decided to deliver pure DC. So I upgraded the drivers to these metal cone varieties. The magnets (neodymium) are big partly due to the shielding which is done with magnetic repulsion. The cones are ultra-light and very rigid and the surrounds compliant. Power rating is 25WRMS and under listening tests, in the enclosures, go down to 100hz. The over-all sound is bright (see other image). The crossover is 1st order and additional dampening was added to the box.
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SV101502.JPG10" DIY Subwoofer - The 4th Dimension7131 viewsYou can spend thousands of dollars and hundreds of hours making improvements to your system which may only make the slightest bit or difference (or so you think) . I put in a sub-woofer system based around a inexpensive 10" convex driver, DIY sub-woofer processor and a DIY 200W amplifier. Suddenly my system has a whole extra dimension.
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6SN7-6L6-Tube-Amp-3.jpg6SN7 / 6L6 Tube Amp7108 viewsWilliamson front end and phase splitter, with ultralinear output stage. 6SN7, followed by another 6SN7 driving a pair of 6L6.

Tube Amp Schematics: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
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Realistic-Minimus77-Speakers-Grills-On.jpgRealistic Minimus 77 Speakers with HiVi BN4 Midbass Drivers7079 viewsThese Tandy / Realistic / Radio Shack Minimus 77 (metal enclosures) speakers had already had one upgrade with better quality 4" drivers some months back. But after a chip amp delivered pure DC into the driver, thus melting the voice coil, repair was required. The drivers are Jaycar (Australian hobby shop) re-branded HiVi BN4 4" aluminum / magnesium convex diaphragm drivers (see other image). The overall sound is bright with little music much below 100Hz. But as PC speakers or compact bookshelf boxes they are satisfactory. The crossover (1st order) was also upgraded with the high pass capacitor upgraded to a polypropylene metal film type.
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Fostex-FE127E-Sealed-Bipole-Loudspeaker.jpgFostex FE127E Sealed Bipole Loudspeaker7051 viewsMy version of the DIY Fostex FE127E Sealed Bipole Speaker build.
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Jordan-JX92S-Tower-Bass-Reflex-Speakers.jpgJordan JX92S Tower Bass Reflex Speakers7050 viewsDo-It-Yourself (DIY) Tower Loudspeakers constructed using the Jordan JX92S Full Range Speaker Driver. The speaker box enclosure is bass reflex (ported). See the Jordan JX92S DIY Bass Reflex Tower Speakers page for full information about this project.
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FE167E.JPGFostex FE167E Fullrange Driver in Bass Reflex Enclosure7038 viewsI required some efficient speakers to compliment a small valve (6T9) amplifier which produced only a few watts. Here are the finished speakers. The enclosure design is the Fostex FE167E Recommended Bass Reflex Enclosure (15L). 18mm MDF was used which was glued and nailed together. The back panel (internally) has a layer of heavy sound absorbing vinyl glued to it and all internal walls have a thick layer of Dacron tacked to them. First impressions of the sound is very clear with strong transient response and pin point sound stage.
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Underside-AMP6-Tripath.jpgUnderside View of Finished T-Amp Kit 7030 viewsHere is a view from the underside. The large transformer was salvaged from a dead computer UPS. For more details, see the DIY T-Amp project page.
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TDA2003-DIY-HiFi-Amplifier.jpgTDA2030 DIY HiFi Amplifier7011 viewsAnother excellent looking build by vortchun. This DIY amplifier is built around the TDA2030 which will put out a maximum of 14W. The wooden enclosure matches the previously completed Voight Pipe Speakers Visaton BG 17 driver project.

For full details of this TDA2030 chip amplifier build, see the TDA2030 DIY Amplifier thread on the discussion forum.
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DIY-Speakers-and-Subwoofer.jpgDIY Speakers and DIY Subwoofer 7008 viewsI just finished building some budget speakers and subwoofer. Very basic design but that is the look I was after. It is my first project so I kept the components cheap. It sounds quite good considering the cost. Certainly a lot better sound than the speakers I was considering which cost 5 times the amount. Also I had fun and learned a lot along the way.

To get a perfect gloss finish and without the need to bog and sand screw holes, I first screwed the 19mm MDF together and then laminated (glued) 3mm MDF over the top. Next I trimmed the edges of the 3mm MDF with a router fitted with a laminex trimmer. After a light sand the boxes were ready to finish with no chance of seeing any screw holes.

I also made a cabinet to match and used some perspex for the centre panel and sprayed it the same colour as the subwoofer.

I hope this has inspired any budding diy speaker newbies. Im hooked now, im already planning my next project with better components.

Ben
Push-Pull-KT88-Tube-Amp.jpg
Push-Pull-KT88-Tube-Amp.jpgMillett UniAmp: Push Pull KT88 Tube Amplifier6993 viewsPete Millett UniAmp with KT88
Transformer input (phase splitter) 6SN7 driver / 6SN7 voltage gain. Push-Pull KT88 Amplifier section. 5AR4 power supply into 47uF then 10 H (draws about 165mA from 620V CT transformer) then 2700uF @ 400VDC.
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mURI_temp_e4a2b45b.jpgDIY Speaker Cable - Twisted Pair Design6993 viewsThis is DIY Speaker Cable that I made for a friend.
This is the regular twisted pair design with the double shielding. I've used the regular heat shrink tube for the primary shield and nylon braided sleeve for the secondary shield.

The ends are terminated via plastic banana pins.

Here are my DIY Braided Speaker Cables.
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K-16LS-Tube-Amplifier-Kit-Hammond-OPT.jpgK-16LS Tube Amp Kit with Hammond OPT6985 viewsAndy's son put also together a K-16LS Tube amplifier kit with the additional tone control preamp section. He used Hammond Output Transformers in place of the ones which came with the kit. See see his Andy's webpage for more photos and information.

Also, additional information about the S-5 kits is available at the Tube Amplifier Kit page.
Copper_Steampunk_K-12GTube_Amplifier_Kit_2.jpg
Copper_Steampunk_K-12GTube_Amplifier_Kit_2.jpgCopper Steampunk K-12G Tube Amp Kit - Rear6971 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
Half-Chang-map-170608.pdf
Half-Chang-map-170608.pdfHalf Chang Speaker Plans6970 viewsHalf Chang Speaker Plans used to construct my Half Chang Speakers with Audio Nirvana Super 8 Cast Frame Drivers
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SV101780.JPGOpen Baffle Speakers - Rear6968 viewsThis shot shows the OBs before two layers of darcon were stapled to the rear leaving only the woofer rears exposed. The particle board is 18mm the woofers 10", mids 2" domes and titanium tweeters. The Xover is a 2nd order. I replaced the HF caps with metal film polypropylene varieties from electrolytics. Heavy metal brackets join the base board and baffle broad. The boxes recline slightly so the speakers will stand up without other assistance.

Listing is pleasant with voice bright and bass OK but not deep. The woofers are new and very stiff so bass response may follow many hours of playing. See other image.
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DIY-Silver-Wire-RCA-Interconnect-Cables.JPGDIY Interconnect Cables with Silver Wire6967 viewsSimple DIY RCA interconnect cable project made using pure silver wire.

Related: DIY Silver RCA Interconnect Cables
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DIY-Class-A-Mosfet-Amplifier.jpgDIY Class A Mosfet Amplifier6958 viewsAnother variation of Mark's 2SK1058 Mosfet Amplifier. Here is a photograph of the inside of this DIY 2SK1058 Mosfet Amplifier project.
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DIY-Three-Way-Tower-HiVi-Loudspeakers.JPGDIY Three Way Tower HiVi Loudspeakers6941 viewsThese are David's version of the DIY 3-Way HiVi Tower Loudspeakers by Adam. Each of the three-way tower loudspeakers uses one HiVi F8 woofer, two HiVi F5 mid-woofers and a HiVi RT1C-A Planar Isodynamic Tweeter. The tower loudspeakers follow the plans for Adam's build with the exception that a HiVi Research RT1C-A is used in place of the HiVi SD1.1A.
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mURI_temp_c69bbe4a.jpgDIY Towers Speakers6940 viewsThis is the DIY folded horn tower speaker that I did recently !
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