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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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Seas_FA22RCZ_in_Open_Speaker_Cabinet.jpg
Seas_FA22RCZ_in_Open_Speaker_Cabinet.jpgSeas FA22RCZ Fullrange in Open Speaker Cabinet7157 viewsThis is a "open cabinet" speaker that uses a Seas FA22RCZ driver (200 mm (8") fullrange). As you can see, the cabinet is open as it has no bottom. The speaker system impedance measures like a poorly adjusted bass reflex box, while the frequency response measures similar to that of a closed (sealed) cabinet. There is no filter network used with the Seas FA22RCZ driver.

The sound is very clean, open and free of compression artifacts, similar to open baffle speakers. Nevertheless, it has a satisfying bass depth.

See my blog for more information. It is written in German but you can use the Google translate tool on the right side of the page.

Kind regards,
Carsten Bussler from Germany
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Workshop_Heater.JPG2nd DIY OTL monoblock being built7013 viewsFreezing cold in the workshop , it was a pleasure to be right next to the first monoblock that was pre heating and breaking in the output stage.
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DIY-Class-A-Mosfet-Amp.jpgDIY-Class-A-Mosfet-Amp7003 viewsThe fellows over at the Russian audio community datagor.ru have now built a small handful of Mark's simple DIY Class A Mosfet Amplifier project. See the schematic for more details about this build..
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Scanspeak-8531-D3004-6600-00-T-Line.jpgScanSpeak Revelator 8531 MidBass / D3004-6600-00 Tweeter in Transmission Line Enclosure6977 viewsScanSpeak 8531 mid-bass and Scanspeak RevelatorD3004-6600-00 Aircirc tweeters in a transmission line housing, with the tweeter in separate decoupled enclosure. The cross-over is suspended externally underneath the main housing.
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057.JPGsaba open baffle speakers6975 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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K-502-Tube-Amplifier-Kit.jpgK-502 Tube Amplifier Kit6854 viewsBarry's wood and Plexiglas enclosure for the K-502 Tube Amplifier Kit.
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Main_-_Copy.JPGLarge mains Speaker using the Lambda 12 TDs drivers 6851 viewsAt 2 foot square and 5 foot tall and 200 lbs. each, these mains produce some of the finest music I have ever heard. I've installed 4 Eminence 15" passive radiators in each cabinet resulting in a tuning frequency of 23 hz.
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Dallas-Back-Loaded-Horn-Speaker-Fostex-FE206E.jpgDallas Back Loaded Horn Foxtex FE206E Speakers6824 viewsPair of Back (rear) Loaded Horn Speakers using the Fostex FE206E driver. The drivers are modified with a custom DIY phase plug. The enclosure design is the Dallas by Ron Clarke. The cabinets were built by Keith.

For more information, see the Dallas Back (Rear) Loaded Horn Speakers with Foxtex FE206E thread on the forum.
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Fostex-FE127E-DIY-Bookshelf-Speakers.jpgFostex FE127E DIY Bookshelf Speakers6818 viewsDIY Bookshelf Speakers using the Fostex FE127E fullrange speaker driver.
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DSC00006_-_Copy.JPGDual stacked dual driver SoundSplinter subwoofers6813 views5 cu ft subwoofers with the SoundSplinter 15" drivers and 4- AE 15" flat passive radiators in each cabinet. I have them stacked or co-located to act as a single subwoofer. These subs model out to 13 hz at 1000 watts. Each subwoofer has a 1450 watt pro amplifier with the Reckhorn B-1 bass management system to control all frequency duties.
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DIY-2SK1058-Class-A-Amp-Day.JPGSingle Ended Class-A Amplifier using 2SK1058 Mosfet6796 viewsOutside view of Sergiy's amplifier build. For more information, see the DIY Class-A Single-Ended 2SK1058 Mosfet Amplifier Project page.
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6T9FE167E.JPG6T9 Tube Amp and Fostex FE167E in Ported Enclosure.6785 viewsIf you have never built a tube amp, but wanted to, this low power SE 6T9 Tube Amp is a good starting point. But it will need efficient loudspeakers to go with it. The 6T9 amp cct. brd. is from Spare Time Gizmo. All components required can be easily obtained and the amp is simple to build. The Fostex FE167E is a 94dB efficient full range driver and works well with the low power 6T9 amp. All you need now is a CD player and you have an excellent den system or small listening room set-up. Let your mates have their B&Os you have something unique, great sounding and you built it all yourself! See the DIY Fostex FE167E Bookshelf Speaker page for more information about the speakers.
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Happy_Feet.jpgDIY Loudspeaker Feet6748 viewsThis is a photo of my loudspeaker feet project. For instructions on how to build the loudspeaker feet, see the DIY Loudspeaker Feet Instructions in PDF.

Much regards,
Guus Das.
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DSCF1666~0.JPGTransmission Line for Jordan JX9256726 viewsThe Jordan JX92S fullrange drivers look great in this beautifully made transmission line enclosure. Pat from the Melbourne Audio Club drives them with either a pair of valve monoblocks or other SS amps he owns. These including a Sony vintage VFET power amp preamp combo.

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6SN7-6L6-Tube-Amp-3.jpg6SN7 / 6L6 Tube Amp6708 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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SV101502.JPG10" DIY Subwoofer - The 4th Dimension6696 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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Underside-AMP6-Tripath.jpgUnderside View of Finished T-Amp Kit 6678 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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PreampComp.jpgMelbourne Audio Club - Preamp Comparison Night6642 viewsAt the May GM of the Club we did a blind A/B comparison between my 12AX7 Tube Preamp and OP Amp Preamp while the rest of the gear remained unchanged. No member knew whether he was listing to the valve or chip preamp, just A or B. Two similar tracks was played from a wide range of music styles the first track on one preamp and the second track on the other. The members voted 60/40 in favor of the chip preamp.
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Realistic-Minimus77-Speakers-AlMg-Driver.jpgHiVi BN4 Anodised Aluminium / Magnesium Midbass Drivers6641 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.
DIY_Loudspeaker_Feet.pdf
DIY_Loudspeaker_Feet.pdfDIY Loudspeaker Feet Instructions6609 viewsHere are DIY instructions to construct feet for returning loudspeakers to the exact same position. Here is a link to a photograph of the finished DIY Loudspeaker Feet.

Much regards,
Guus Das.
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