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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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Jordan-JX92S-Transmission-Line-Loudspeakers.jpg
Jordan-JX92S-Transmission-Line-Loudspeakers.jpgJordan JX92S Transmission Line Loudspeakers5775 viewsThe Jordan JX92S fullrange drivers in solid oak MLTL cabinets. These sound great. See my site for more details. Aug 20, 2008
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Jordan-JX92S-Transmission-Line-Speakers.jpgJordan JX92S Transmission Line Speakers5900 viewsPair of Jordan JX92S fullrange drivers in a solid oak loudspeaker enclosure. The enclosure is the MLTL 48 transmission line design with a slightly smaller cross-sectional area. More details and pictures are available at my site. Aug 20, 2008
Capacitance-Multiplier-Power-Supply-Class-A-Amp.jpg
Capacitance-Multiplier-Power-Supply-Class-A-Amp.jpgCapacitance Multiplier Power Supply For Class-A Amp9632 viewsUsing Rod Elliot's Capacitance Multiplier Power Supply with Mark's DIY Class-A 2SK1058 MOSFET Amplifier.

This is a big improvement in heat dissipation, but I still may make more improvements to make it run cooler though.
Aug 19, 2008
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Fonken-Fostex-FE127E-Speaker.jpgFonken Speaker Enclosure for Fostex FE127E8778 viewsA pair of Fonken speaker cabinets for the Fostex FE127 fullrange driver. So far they sound very nice.Aug 17, 2008
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Finished~0.JPGOPA2134 Opamp Preamp - Big Brass Knob3401 viewsMy third Burr-Brown OPA2134 based preamp sees a sleek red die-cast aluminum case of two coats of epoxy paint and a sexy 4 oz brass knob. This build is based around the 1uf Jupiter Bees Wax and Paper caps. See other photos for more info. The first thing I notice when playing this preamp through my valve monoblocks was a dramatic increase in bass. The other obvious audio advantage is an increase in stereo focus. Not only is bass deeper (and louder) but there appears to be more layers to it. Voice sounds earthier and more immediate. A 26V 3.5A computer PS powers the unit but each channel has its own and separate virtual PS. Five 220uF low ESR caps store power directly on the cct. brds. A suspended wooden floor in the case provides a base to suspend the cct. brds on. Silver wire and silver solder is used throughout with an Alps blue velvet attenuator. Very impressive sound. The very best one I have made to date.Aug 06, 2008
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Rear.JPGOPA2134 Opamp Preamp - Bees Wax Paper Capacitor3051 viewsThis is the third of these diy opamp preamplifiers I have made using the Burr-Brown OPA2134 chip. In this build as with my last (which was sold to an audio buff in Denver) I included two switchable inputs. I used 1uF Bees Wax and Paper Jupiter caps (see other photos) which have increased the bass depth a lot. A lot of resonance dampening has been employed. This is a smart looking and very smart sounding preamp. The stereo focus has increased dramatically.Aug 06, 2008
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Underneath.JPGJupiter Bees Wax and Paper Capacitors - OPA2134 Opamp Preamplifier4363 viewsWhen you get bored with high voltage valve amplifiers you start to look to other things to get your audio gear junky fix. I have always like the weird combos of materials in coupling/audio caps. I started with Jupiter Bees Wax and Paper caps and built a preamplifier around them. They are the dynamite sticks you can see. These are hand made and have silver connecting wire. Pure silver wire was used throughout and silver solder. Alps blue velvet attenuator and gold plated RCA add to a rich mix of components. The active bit is the Burr-Brown OPA2134 in milled sockets. Two sets of inputs are switchable and each channel has its own virtual power. This unit runs from a 26V 3.5A computer power pack. A timber suspended, tar and heavy Al foil dampened floor provides the base for the cct. brds. which sit on standoffs and are rubber grommet dampened. The lid and base of the thick die-cast aluminum case are also tar and foil lined.Aug 06, 2008
Fostex-FE127E-Sealed-Bipole-Loudspeaker.jpg
Fostex-FE127E-Sealed-Bipole-Loudspeaker.jpgFostex FE127E Sealed Bipole Loudspeaker6661 viewsMy version of the DIY Fostex FE127E Sealed Bipole Speaker build.Aug 05, 2008
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DIY-Interconnect-Wires.jpgDIY RCA Interconnect Cables9711 views24ga shielded silver plated OFC copper twisted pair with Teflon dielectric. Machined RCAs and hardware are from surplus auto interconnects. Including TechFlex and heat shrink, these cost under five bucks.

Related: DIY RCA Silver Interconnect Cables
Aug 05, 2008
YAHA-Headphone-Amp.jpg
YAHA-Headphone-Amp.jpgYAHA Headphone Amplifier4271 viewsHere is on of my YAHA builds, I have never been a fan of Altoid tins. Later I used the Yaha voltage gain stage in my 12AU7 Tube / IRF612 MOSFET Hybrid Headphone Amplifier project. Aug 05, 2008
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6T9-SE-Tube-Amp-Kit.jpg6T9 Tube Amp with Edcor Output Transformers3216 viewsThe addition of the Edcor OPTs (XSE15-8-5K) has allowed this little amp to perform to its full potential. -3dB points are 30Hz and 20kHz and though the 1kHz square wave is a little wobbly, the amp plays well with good bass and lots of treble. See the 6T9 Tube Amp Project page for full details.

Also, here is a Ultra-Linear 6T9 Tube Amplifier that I built.
Jul 28, 2008
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mURI_temp_407ba9b9.jpgDIY Tower Loudspeakers6186 viewsThe empty front panel close-up !Jul 22, 2008
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mURI_temp_83a855a8.jpgDIY Folded Horn Tower Speaker6197 viewsHere is a front close-up of the tower speakers !Jul 22, 2008
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mURI_temp_c69bbe4a.jpgDIY Towers Speakers6595 viewsThis is the DIY folded horn tower speaker that I did recently !Jul 22, 2008
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mURI_temp_f1d472f0.jpgDIY Speaker Cable6378 viewsThe cable in the beginning of the project.Jul 21, 2008
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mURI_temp_630f4f06.jpgDIY Speaker Cable5732 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.

Also, here is a pair of DIY Braided Speaker Cables that I made.
Jul 21, 2008
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mURI_temp_e4a2b45b.jpgDIY Speaker Cable - Twisted Pair Design6524 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.
Jul 21, 2008
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Twinings.JPG12AX7 Valve Preamp in Twinings Tea box3674 viewsThis is the fourth 12AX7 tube based preamplifier kit I have built. A Twinings presentation tea box was used as the case (similar to my Gwado CMoy / Grado RA1 Headphone Amp) with a remote PS. Cardas caps were used, all pure silver wire, silver solder, Alps blue velvet attenuator and 4 oz brass knob. The rear has a terminal strip for all the connections and the case is lined with a tar and aluminum film. The power supply has speaker absorbing vinyl lining it to ensure the switch mode tranni remains quiet.Jul 15, 2008
TwiningsRear.JPG
TwiningsRear.JPGWooden boxed 12AX7 Tube Preamplifier3110 viewsThis is my fourth of these 12AX7 valve preamp kits in which I built it in a wooden tea box and used Cardas Capacitors. The connections to the timber box are made by a 3mm think aluminum strip.The remote power supply is hard wired to the preamp via a short cord. This preamp has brought an element of focus to my 6T9 Tube Amplifier, Fostex speakers and from early listening, greater detail across the board. Jul 13, 2008
FE103E-TQWT-speaker-package.jpg
FE103E-TQWT-speaker-package.jpgTQWT for the Fostex FE103E8554 viewsA nicely finished Tapered Quarter Wavelength Tube (TQWT) Loudspeaker from Japan. The enclosure is for the Fostex FE103E Fullrange Speaker driver.Jul 09, 2008
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