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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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DIY-Phono-Turntable-1.jpg
DIY-Phono-Turntable-1.jpgDIY Phono Turntable10812 viewsDo-It-Yourself (DIY) phono turntable. I used MDF filled with concrete / latex added to mix then veneered with Quilted Maple. The bearing is High grade SS and the cup is made of Oilite. The spikes are 2 piece with a rubber damper inside. The Motor is powered by a UPS battery enclosed in the small matching box.
Doug M
Oct 21, 2008
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IMG_2675.JPG50EH5 / 25EH5 Tube Amplifier Internals3009 viewsFinally, the internals of the 50EH5 tube amp. I think I went a bit extreme on the fancy parts as I used 100uF Black Gate's and 62 ohm Riken's on the cathode bias of the tubes. As for the preamp I used more Riken's and a couple of 0.1 Mundorf plate caps. I also used a 12AT7 rather than the 12AX7, although they are interchangeable to what ever you decide. I then re-used a 500K pot as the volume control instead of the 100K (because that is what I had) and added a switch between preamp and line in. Oct 16, 2008
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IMG_2678.JPG50EH5 / 25EH5 Tube Ampr with 12AU7 Mini Tube Preamp2603 viewsYet another picture of the 50EH5 Tube amp in action along side with the Mini 12AU7 tube preamp.Oct 16, 2008
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IMG_2685.JPGDIY 50EH5 / 25EH5 TUbe Amplifier in the dark2211 viewsHere we have a picture of my 50EH5 / 25EH5 amp in the dark, along side with my Mini 12AU7 preamp.Oct 16, 2008
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DIY-Three-Way-Tower-HiVi-Loudspeakers.JPGDIY Three Way Tower HiVi Loudspeakers6259 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.Oct 14, 2008
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DIY-Three-Way-Tower-HiVi-Speakers.JPGDIY Three Way Tower HiVi Speakers6035 viewsDavid has completed a build of Adam's DIY 3-Way HiVi Tower Speaker Project. Each three-way tower loudspeakers uses one HiVi F8 woofer, two HiVi F5 mid-woofers and a HiVi RT1C-A Planar Isodynamic Tweeter. The speaker is the same as the original build with the exception that a HiVi Research RT1C-A tweeter is used in place of the HiVi SD1.1A tweeter.Oct 14, 2008
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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. Oct 14, 2008
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Realistic-Minimus77-Speakers-Grills-On.jpgRealistic Minimus 77 Speakers with HiVi BN4 Midbass Drivers6475 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.Oct 14, 2008
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00005.jpg25EH5 / 50EH5 Tube Amplifier2661 viewsAnother view of the amplifier from the top. As you can see, I was using headphones as I took the effort of adding a jack with impedance matching resistors so I could listen to my music in peace. The funny thing is that I can apply just about any load to the amplifier without any audible change other than volume.Oct 13, 2008
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IMG_2554.JPG50EH5/25EH5 Filament Reg. Power Supply2555 viewsThis is the inside of the regulated power supply for the 50EH5 / 25EH5 tube filaments. It uses an LM317 voltage regulator and an old VCR power transformer that had just the right voltage and current ratings for the filaments of the 50EH5 / 25EH5 tubes. The output from the regulator is set for 20 some volts for the 25EH5's, and the unregulated DC is about 45V for the 50EH5's.Oct 13, 2008
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IMG_2142.JPGGlowing 12X4 Tube2368 viewsThis is a glowing 12X4 / 6X4 tube in a full wave bridge rectifier power supply. I've only seen a couple of people use a diode and tube type bridge rectifier, but I personally like this setup. This type of bridge rectifier is used in my 50EH5 amp but using a 6AX5. This is a project I have not finished yet.Oct 13, 2008
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IMG_1960.JPGMini 12AU7 Tube Preamp2760 viewsAnother picture of the 12AU7 tube preamp close up showing the input/output plugs on the side. The preamp got its name from being nearly impossible to wire the internal parts because of the small case.Oct 13, 2008
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DIY-Jordan-JX92-Tower-Loudspeakers.jpgDIY Jordan JX92 Tower Loudspeakers8248 viewsTower speaker project made around the very well regarded Jordan JX92S Full Range Speaker. The speaker box is a floor standing bass reflex enclosure. For full details about this DIY speaker project, see the DIY Jordan JX92S Bass Reflex Tower Loudspeaker page.Oct 13, 2008
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Jordan-JX92S-Tower-Bass-Reflex-Speakers.jpgJordan JX92S Tower Bass Reflex Speakers6416 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.Oct 13, 2008
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Aussieamps-nxV200-V-Fet-200W-Class-D-amp.JPGAussieamps nxV200 V-FET 200W Amplifier10297 viewsI was given the task to assemble two complete stereo amps based on the Aussieamps nxV200 V-FET amp modules. These are exquisitely made extremely compact amp modules based on two large and very powerful V-FETs. The remaining components are surface mounted (SMT). To achieve 200W into 4ohms a +/- 56V was required. The toroid transformer has 40V windings and 20,000 uF 100V caps (per rail and snubbed) are used. Four fast high surge diodes (each snubbed) made up the rectifier.

OFC medium gauge speaker wire was used for hook-up with silver soldier. Large brass cones
hold the amp high off the ground for cooling and resonance control.

The sound is pristine, clean and clear. Stereo image is detailed and 3D holographic. This amp will play extremely loud when pressed showing no signs of harshness or stress. I recommend the amp modules.
Oct 12, 2008
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DIY-12AU7-Tube-Preamplifier.jpgMini 12AU7 Vacuum Tube Preamplifer2510 viewsThis is a simple 12AU7 tube preamp built using a couple of Hammond cases and a few reused parts.
By: Alan M.
Oct 11, 2008
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DIY-50EH5-25EH5-Tube-Amp.jpgDIY 50EH5 / 25EH5 Tube Amplifier2888 viewsThis tube amplifier project uses the parts from a junked Fleetwood console stereo. It uses a 6AX4 full wave bridge rectifier two 5A 400V fast recovery diodes. The preamp tube is a 12AX7 and the power tubes are 50EH5. I followed the basic ideas from Gio's DIY 50EH5 Tube Amplifier Project. This is my super sized version of the amp with all DC regulated filament supplies and even does a lower frequency response than usual because of larger output transformers (underneath the chassis).
Oct 11, 2008
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top1.jpgPush-Pull 6T9 Stereo Tube Amplifier4214 viewsThis is a project I started some time ago which was inspired by the Spare Time Gizmo's 6T9 Tube Amplifier Kit. I decided to make it push-pull using circuit ideas from my Eico HF-81 and my RCA Receiving tube manual. The combination wood and brass chassis came about when I found a small sheet of brass shoved under a cabinet and long forgotten about at work. It took a bit of work to clean it up and polish it to that shine! The wood is poplar purchased at Lowes, stained with Minwax Red Mahogany stain and finished with Amber Shellac.

Additional information: 6T9 Push-Pull Tube Amplifier
Oct 08, 2008
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nvx200-amplifier-module.jpgnxV200 DIY Amplifier Module13374 viewsThese Australian designed amplifier modules are beautifully made with surface mounted components. They use V-FETS for the main power device and are extremely compact. I have been asked, by the purchaser of these modules, to build them into complete amps in a bi-wire (woofer/mid and tweeter) configuration. And to design the PS for each. We have chosen to construct the modules in two separate enclosures, so two modules per enclosure and PS.

The speakers they will be driving are bi-amp ready and the amps will be driven by active crossovers with level controls.
Oct 03, 2008
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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.
Sep 30, 2008
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