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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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3.jpgDIY Guitar Amplifier 6885 viewsA photograph of the finished DIY Guitar Amplifier. The simple graphics on the faceplate are custom made and a fender speaker cover is used. The amplifier is a K-16LM 16W Mono Tube Amp Kit.
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Lowther_DX3_Open_Baffle_Speaker.jpgLowther DX3 Open Baffle Speakers6882 viewsBaffle height: 56", Baffle width: 25", 20 mm marine plywood
Baffle sloped 10° to the rear to time-align the drivers.
Fane POP100 18": centre 13" from floor.
Lowther DX3 8": 34" from floor, offset 3" from centre line.
Tweeter 2": upward firing from the top of the baffle.

Acoustic shelf: 26" from floor, 9" wide and 6" deep, centre aligned with the Lowther.
Bass box sides: 10" deep at the bottom, 5" deep at top, 26" height.
Bass port shelf: fitted across the centre of the bass speaker.

Crossover:
6dB per octave
Bass turn-over frequency 120 Hz
Lowther roll-off frequency 240 Hz (high frequencies not rolled off)
Tweeter roll-off frequency 6,000 Hz 12dB per octave

The sound has the typical Lowther wide open mid-range, quick and revealing, even with an old, low powered solid state amp. Usually Lowthers are expected to be in horns, but on a big open baffle, they just fill the room and work just as well.

electric triode (Australia)
www.amplifiers.com.au
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Underside-AMP6-Tripath.jpgUnderside View of Finished T-Amp Kit 6872 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.
Fostex-FE127E-Sealed-Bipole-Loudspeaker.jpg
Fostex-FE127E-Sealed-Bipole-Loudspeaker.jpgFostex FE127E Sealed Bipole Loudspeaker6833 viewsMy version of the DIY Fostex FE127E Sealed Bipole Speaker build.
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Realistic-Minimus77-Speakers-Grills-On.jpgRealistic Minimus 77 Speakers with HiVi BN4 Midbass Drivers6818 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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Jordan-JX92S-Tower-Bass-Reflex-Speakers.jpgJordan JX92S Tower Bass Reflex Speakers6812 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 Enclosure6802 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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DIY-Speakers-and-Subwoofer.jpgDIY Speakers and DIY Subwoofer 6794 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
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AMP6-T-Amp-Kit-Parts.jpgAMP6 Kit from 41hz.com6784 viewsThe AMP6 kit from 41hz.com. See the project page for my experience with the DIY AMP6 kit.
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Push-Pull-KT88-Tube-Amp.jpgMillett UniAmp: Push Pull KT88 Tube Amplifier6773 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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Half-Chang-map-170608.pdfHalf Chang Speaker Plans6752 viewsHalf Chang Speaker Plans used to construct my Half Chang Speakers with Audio Nirvana Super 8 Cast Frame Drivers
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DIY-Class-A-Mosfet-Amplifier.jpgDIY Class A Mosfet Amplifier6749 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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SV101780.JPGOpen Baffle Speakers - Rear6737 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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mURI_temp_c69bbe4a.jpgDIY Towers Speakers6732 viewsThis is the DIY folded horn tower speaker that I did recently !
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mURI_temp_e4a2b45b.jpgDIY Speaker Cable - Twisted Pair Design6698 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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TDA2003-DIY-HiFi-Amplifier.jpgTDA2030 DIY HiFi Amplifier6691 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-Silver-Wire-RCA-Interconnect-Cables.JPGDIY Interconnect Cables with Silver Wire6689 viewsSimple DIY RCA interconnect cable project made using pure silver wire.

Related: DIY Silver RCA Interconnect Cables
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1_phono_pre.jpgKit form Phono Preamp6685 viewsPaul's rendition of the MM Phono Preamplifier Kit is both neat and very serious looking. The small instrument case matches a 12AX7 Valve Amplifier of mine that Paul is now using. Paul, like me is very pleased with the sonic qualities of this inexpensive phono preamp kit. He did note it took a day or two to sell to a smoother sound.
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New_Set-up_-_Copy.JPGCompleted home theater/living room set up6679 viewsFull range, DIY home theater system, 4 amplifiers, 16-15" passive radiators, and a lot of pride of ownership!
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K-16LS-Tube-Amplifier-Kit-Hammond-OPT.jpgK-16LS Tube Amp Kit with Hammond OPT6673 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.
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