DIY Audio Projects Photo Gallery
 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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Lowther_DX3_Open_Baffle_Speaker.jpg
Lowther_DX3_Open_Baffle_Speaker.jpgLowther DX3 Open Baffle Speakers6429 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
LM3875-Monoblock-Amps.JPG
LM3875-Monoblock-Amps.JPGLM3875 Chip Amp Monoblock Amplifiers6422 viewsChip amp monoblock amplifiers based on a retro look and the LM3875 chip.
dscf1833.jpg
dscf1833.jpgFostex FE127E FS Fonkens6363 viewsHere is the setup in the basement. The new Audio Nirvana Super 12s are what are sitting on the Fostex FE127E Fonkens. I am breaking them in and will be building bass reflex cabinets soon.
K-16LS-Tube-Amplifier-Kit-Hammond-OPT.jpg
K-16LS-Tube-Amplifier-Kit-Hammond-OPT.jpgK-16LS Tube Amp Kit with Hammond OPT6361 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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dscf1832.jpgFostex FE127E FS Fonkens6354 viewsDriver is the Fostex FE127E. Veneer is Beeswing Saples. A royal PITA to work with.
sm-Mains_final_Crossover.jpg
sm-Mains_final_Crossover.jpg3-Way Crossover6334 viewsCrossover for my main speakers with twin Lambda 12 TDs mid woofers, 4 passive radiators, 2 scan speak mids, and HIVI research RT2II tweeter
DIY-HiVi-SP10-Subwoofers.jpg
DIY-HiVi-SP10-Subwoofers.jpgDIY HiVi SP10 Subwoofers6323 viewsDaniel's build following Adam's DIY HiVi SP10 Subwoofer Project. Daniel reports that the subwoofers produce low frequencies which are accurate and very well defined. There are many more pictures and information about Daniel's build at his webpage.
K-8LS-Tube-Amplifier-Kit.jpg
K-8LS-Tube-Amplifier-Kit.jpgS-5 Electronics K-8LS Tube Amplifier Kit6320 viewsS-5 Electronics K-8LS Tube Amplifier Kit on the work bench for testing.
AMPVIEW.jpg
AMPVIEW.jpgFinished K-12M Tube Amp Kit6315 viewsThe finished S-5 Electronics K-12 Tube Amplifier Kit.
TDA2003-DIY-HiFi-Amplifier.jpg
TDA2003-DIY-HiFi-Amplifier.jpgTDA2030 DIY HiFi Amplifier6305 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-Three-Way-Tower-HiVi-Loudspeakers.JPGDIY Three Way Tower HiVi Loudspeakers6298 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.
mURI_temp_f1d472f0.jpg
mURI_temp_f1d472f0.jpgDIY Speaker Cable6284 viewsThe cable in the beginning of the project.
bass_table.jpg
bass_table.jpgSubwoofer Coffee Table6284 viewsA subwoofer which has been transformed into a coffee table.
2SK1058-SE-Mosfet-Amp.jpg
2SK1058-SE-Mosfet-Amp.jpg2SK1058 Single-Ended (SE) Amplifier6262 viewsThis Class-A power amplifier with zero negative feedback and 5W output audio power was built based on the schematic of the DIY Class-A 2SK1058 MOSFET Amplifier project by Mark Houston.

The amplifier uses a custom handmade choke coil.
The power supply uses 4 x 15000 µF Towa capacitors designed for Adcom.
Two large heatsinks and one 88mm fan provide enough cooling to keep the temperature below 60°C.
The amplifier is used with custom made sensitive acoustics.
The sound is very precise and detailed. It has deep sound staging and amazing microdynamics.

For more pictures please visit http://alexkap.com/.
ClubPreampComp.jpg
ClubPreampComp.jpgMelbourne Audio Club preamp comparison night equipment6250 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.
Fostex-FE127E-DIY-Bass-Reflex-Speaker-1.jpg
Fostex-FE127E-DIY-Bass-Reflex-Speaker-1.jpgFostex FE127E DIY Bass Reflex Speaker6202 viewsClose up view of the finished bookshelf speakers. The speakers are based on the plans of Rabbitz Fostex FE127E DIY Bass Reflex Bookshelf Speakers.

The woodworking and painting of the cabinets were completed by a friend.
6SN7-6L6-Tube-Amp-1.jpg
6SN7-6L6-Tube-Amp-1.jpg6SN7 / 6L6 DIY Tube Amp6186 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
mURI_temp_83a855a8.jpg
mURI_temp_83a855a8.jpgDIY Folded Horn Tower Speaker6144 viewsHere is a front close-up of the tower speakers !
mURI_temp_407ba9b9.jpg
mURI_temp_407ba9b9.jpgDIY Tower Loudspeakers6135 viewsThe empty front panel close-up !
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 Kit6130 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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