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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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TSpecial.JPG
TSpecial.JPG6T9 4.7W DIY Tube Amplifier in a Baking Pan3750 viewsA Tube amp kit based on Spare Time Gizmo's printed circuit boards which are plated through, solder masked and screen printed. I sourced common components from the local electronics shop but used a pair of NOS GEC 6T9, Alps potentiometer, solid brass knob and a Hammond power transformer. The chassis is a Teflon coated backing pan ($7). The OPTs are custom wound toroidals. The amp is a little bass shy. Doubling the 100uF power caps helped increase bass. See the 6T9 Tube Amplifier Project for more details.May 19, 2008
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DIY-2SK1058-Class-A-Amp-Day.JPGSingle Ended Class-A Amplifier using 2SK1058 Mosfet6804 viewsOutside view of Sergiy's amplifier build. For more information, see the DIY Class-A Single-Ended 2SK1058 Mosfet Amplifier Project page. May 18, 2008
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DIY-2SK1058-Class-A-Amp.JPG2SK1058 Class-A Amplifier - Inside View8603 viewsInside view of Sergiy's diy amplifier. This is the second version of the 2SK1058 DIY Class-A Single-Ended Mosfet Amplifier that has been built at the Russian audio community datagor.ru using light bulbs in place of load resistors.May 18, 2008
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DIY-2SK1058-Mosfet-Amp-Inside.JPG2SK1058 Mosfet Amplifier - Inside9458 viewsSergiy Makharchuk build of Mark's simple DIY Class A 2SK1058 Mosfet Amp Project. Here Sergiy has used light bulbs in place of the load resistor. The enclosure is recycled from an old piece of physiotherapy equipment.





May 18, 2008
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DIY-2SK1058-Mosfet-Amp-Night.JPGDIY 2SK1058 Class A Mosfet Amp in the dark6431 viewsSergiy Makharchuk from Russia has put together a version of Mark's DIY Class A 2SK1058 Mosfet Amplifier. Here you can see it lit up in the dark.May 18, 2008
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Bottlehead-Seduction-Phono-Preamp-Top.jpgFinished Bottlehead Seduction Tube Phono Preamp3509 viewsA finished view of the Bottlehead Seduction Tube Phono Preamp kit.May 14, 2008
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Bottlehead-Seduction-Phono-Preamp.jpgUnderside View of Bottlehead Seduction DIY Tube Phono Preamp Kit3661 viewsThis is the inside view of the Bottlehead Seduction DIY Tube Phono Preamp Kit. All connections are point to point.May 14, 2008
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Bottlehead-Seduction-Phono-Preamp-6922-Tube.jpgBottlehead Seduction Phono Preamp with 6922 Tube3627 viewsClose up of the Electro Harmonix 6922 Tube on the Bottlehead Seduction DIY Tube Phono Preamplifier Kit.May 14, 2008
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LM3875-Gainclone-Chip-Amp-TF.JPGLM3875 DIY Gainclone / ChipAmp4337 viewsThe front view of my LM3875 Gainclone project. The layout and idea is from the LM3875 Gainclone in a Roasting Pan. The power transformer on top is from an old Yamaha subwoofer that quit working. Power supply capacitors are four 6800 uF and two 4700 uF which are snubbed. Power switch, LED and volume control are at the front.May 11, 2008
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LM3875-Gainclone-Chip-Amp-I.JPGLM3875 Gainclone Raosting Pan / Chip Amplifier4340 viewsThis is my first LM3875 Gainclone / Chip Amp. It was constructed following some of the notes from this LM3875 Gainclone / Chip Amp in a Roasting Pan. The volume control (potentiometer) is an ALPS Black Beauty. All soldering was done using silver solder. The bridge rectifier and capacitors are all snubbed with small, but good quality capacitors.May 11, 2008
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LM3875-Gainclone-Chip-Amp-TR.JPGLM3875 Gainclone / Chip Amp with Baking Pan Enclosure4318 viewsThis LM3875 Gainclone was built following the basic idea around the LM3875 Gainclone in a Roasting Pan. The power transformer is from an old Yamaha subwoofer that stopped working. The power supply consists of four 6800 uF and two 4700 uF capacitors.May 11, 2008
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SV101502.JPG10" DIY Subwoofer - The 4th Dimension6705 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.May 07, 2008
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DIY-Fostex-FX120-Transmission-Line-Speaker.jpgDIY Fostex FX120 Transmission Line Speaker7242 viewsHere the Fostex FX120 fullrange driver is used in a DIY Transmission Line Speaker Enclosure. Fore more information, see the DIY Fostex FX120 Transmission Line Speaker Project.May 05, 2008
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Fostex-FX120-Fullrange-Driver.jpgFostex FX120 Fullrange Driver8189 viewsCloseup of the Fostex FX120 fullrange driver used in a T-Line Speaker Box. For more info, see the Fostex FX120 MLTL Speaker Enclosure project page.May 05, 2008
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DIY-TQWT-Fostex-FX120-Speaker.jpgDIY ML-TQWT Fostex FX120 Speakers8473 viewsA pair of DIY Fostex FX120 Mass Loaded - Tapered Quarter Wavelength Tube (ML-TQWT) Speakers.May 05, 2008
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SV101485.JPGFinished Subwoofer Processor Kit3484 viewsThis analogue OP amp based sub-woofer processor provides a lot of flexibility when it comes to low pass filter adjustment, parametric equalization, sub-sonic filtration, gain and input selection in a slim neat box. But when it comes to set-up and balance with your favorite speakers, there is a lot of work to be done. The kit is from Jaycar Australia.Apr 28, 2008
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SV101481.JPGSubwoofer Analogue Processor4252 viewsThis OP amp based subwoofer processor is a kit available from the local Jaycar electronics shop. There is a lot of soldering and construction so it is not hard to miss a few solder joints. I did. On the first few listens I can see there is a lot of tuning and balancing to be had. I am using a monoblock chip amp / gainclone to provide the final power.Apr 28, 2008
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IMAGE_145.jpgOne valve (tube) 60W guitar amplifier3751 viewsThis guitar amp comprises of one $1000 radio transmitter valve which runs on 700Volts. The driver cct. is on the left and is a multi-stage transistor unit. The OPT on the right was wound by the owner using a primary/secondary interlace config. and then vacuum impregnated. A fan is required at the base of the valve to stop the ceramic socket over-heating. Very loud!Apr 26, 2008
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PIC-0128.jpgBig open baffle speakers8376 viewsThese huge speakers belong to a member of the local audio club and were used in a demonstration of the use of sound baffles to remove unwanted reflections. They consist of a plate amp powered 10" woofer, a co-planar and normal cone mid-range and two small soft dome tweeters. Also a titanium dome tweeter was mounted on the rear and could be switched in or out. The woofer crossover point and volume was also adjustable. Big BASS!Apr 26, 2008
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IMG_1872.JPGriverrat373's K-502 Valve Amplifier Kit - Front4674 viewsFront view of the K-502 Tube Amp Kit without the transformer cover.Apr 19, 2008
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