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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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BrazCherry.jpg
BrazCherry.jpgOrion DIY speakers6025 viewsThese dipole speakers are available as a DIY project, a kit, or completed speakers. You can purchase the plans from Siegfried Linkwitz (www.linkwitzlab.com).
The speakers use two 10" Peerless subwoofers, an 8" SEAS midrange driver and two SEAS Excel tweeters per cabinet. The active crossover circuit board is also available from Linqwitz Lab. The documentation includes all that is needed to build these yourself. For those who want some of the assembly completed, the crossover is available fully assembled and tested. A kit, unique parts and brackets for completing the construction, and completed speakers are also available. The speakers are driven with 8 channels of amplification (60 watts per channel). One can parallel the woofers to get by on 6 channels. There is much information on the web about the quality of these speakers. Anyone seeking very high quality speakers at a DIY price for music reproduction or for home theater will not be disappointed.
Aug 21, 2009
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Jan6814HPAmpIIAirsAnd_CownSmall.jpgJAN6418 portable Triode Headphone Amp MkII2010 viewsThe finished portable triode headphone amp/preamp on top of a pair of audio-technica “AIR” head phones and the Cowon S9 in front. This "out of the box" build of the Oatley electronics JAN6418 headphone amp / preamp has a delicious sound, is compact and quite unique. See other images. It may seem odd to be driving high-end headphones with a space age SS player (Cowon S9) with an amp which employs sub-mini valves developed for the military last century. But it sounds excellent. More information about this little tube kit is available on the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit page.Aug 16, 2009
Jan6814HPAmpIIFinisSmall.jpg
Jan6814HPAmpIIFinisSmall.jpgJAN6418 portable Triode Headphone Amp MkII2371 viewsThe finished (second) headphone amp is assembled in a slim durable plastic enclosure lined top and bottom with bituminized heavy Al foil. You can see the lithium battery, printed cct. brd. and 6.5mm stereo phono sockets. In this build the stereo phono sockets have double pole double throw switches which are all employed, including the “real” switch. The switches make only when both devices are plugged into the amp. The idea is if you do not have devices plugged into both input and output and have the switch on then the unit is “off” with no battery drain. The battery is lithium so expensive bit I should get 80 to 100 hours of play out of this little portable triode headphone amp. See the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit project page for full details.Aug 16, 2009
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Jan6814HPAmpIISmall.jpgJAN6418 portable Triode Headphone Amp MkII2177 viewsThis is a straight build of the oatley electronics sub-mini headphone driver and preamp. In other builds where the basic cct. brd. is used as a preamp the passive components are upgraded and the PT2308, headphone driver chip, though very good, has been upgraded. Not here. This build uses the stock components that came with the kit. See the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit project page for more information and other build variations..Aug 16, 2009
6T9-Tube-Amp-Front.jpg
6T9-Tube-Amp-Front.jpg6T9 Hi-Fi Tube Amplifier Project2228 viewsDIY build of a single-ended 6T9 Tube Amplifier using the PCBs from Spare Time Gizmo. The power and audio output transformers are from Edcor. Mark's 6T9 ultra-liner tube amp modifications were used.Aug 14, 2009
6T9-Tube-Amp-Rear.jpg
6T9-Tube-Amp-Rear.jpg6T9 Hi-Fi Vacuum Tube Amplifier2040 viewsRear view of the DIY 6T9 Tube Amplifier. The amplifier uses circuit boards purchased from Spare Time Gizmo. The power / filament transformer and audio output transformers are from Edcor. Mark's 6T9 ultra-liner tube amp modifications were also used.Aug 14, 2009
TeaBoxRearSmall.jpg
TeaBoxRearSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote PS2409 viewsIn this image you can see the RCA connections and power connections for the remote PS. An XLR plug and socket provide a solid connection for the power cord. Two sets of switchable inputs allows two devices to be selected. A three wire power cord provides 250VDC HT, 6VDC and common earth to the preamp.Aug 12, 2009
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TeaBoxPreampSmall~0.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote 5Y3 PS2252 viewsThis is my second build of the Twinings Tea Box 12AX7 tube preamps with separate 5Y3 valve rectification. Others I have built used an internal or remote SMPS. This build used the massive and expensive Jensen copper, paper and oil caps. Silver wire, WBT silver solder, Solen Teflon caps (feedback) component-2-component wiring make this an exceptional build. There is no cct. brd. A remote PS with valve rec. (Ozzie 5Y3) and Hammond power transformer and 12H choke provide very clean robust power to the preamp Tea Box.

The sound is very 3D with sound stage deep and wide. The full passion of the music comes through with staggering detail making most instruments (acoustic anyway) sound very different. This build has been commissioned by a very astute audiophile in Denver, Colorado. I know he will be pleased. It goes with well used AWA (Amalgamated Wireless Australasia) 12AX7 valves, rare but sweet sounding.
Aug 11, 2009
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TeaBoxInsideSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with External 5Y3 Power Supply2318 viewsIn this build I used the Jensen copper, paper and oil caps for the input, output and inter-stage coupling and Solen Teflon for the feedback capacitor. The preamp is a two stage triode (12AX7s AWA-Australian) with global feedback and is the original Silicon Chip design with some modifications. They are bigger caps all round and no printed cct. brd. Construction of brds. was component-2-component wiring which means there is NO additional wire used on the brd. construction. At the brd. level this is better than point-2-point wiring. This cuts down on soldered connections/junctions and cct. length. All 99.999% pure silver wire with heat shrink insulation is used in the signal path to connect brds. to RCAs and Alps blue velvet pot etc. Medium gauge OFC hook-up wire brings power to the brds. Heavy bituminised Al foil lines the light timber case to provide a ground plain and RFI/EMI shielding. The remote PS employs a 5Y3 rec. tube (Australian made in this case) Hammond 370X power tranni 193B 12H choke.Aug 10, 2009
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JJ-Tesla-Blue-Glass-KT88-Vacuum-Tubes.jpgJJ / Tesla Blue Glass KT88 Tubes2360 viewsA set of Blue glass envelope JJ / Tesla KT88 vacuum tubes used in the Odd Blocks - KT88 Push-Pull Class A DIY Tube AmplifierAug 10, 2009
2SK1058-SE-Mosfet-Amp.jpg
2SK1058-SE-Mosfet-Amp.jpg2SK1058 Single-Ended (SE) Amplifier6228 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/.
Aug 04, 2009
KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpg
KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpgKT88 Push-Pull Tube Amplifier with 12SL7 Driver2300 viewsKT88 Push-Pull Tube Amplifier with a 12SL7 Driver stage and a 6NO30 thermal delay relay tube. The amplifier is build following Bruce's 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp build. The power tubes are new production KT88 Gold Lions made by Genalex.Aug 01, 2009
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Genalex-Gold-Lion-KT88-Vacuum-Tubes.jpgGenalex Gold Lion KT88 Vacuum Tubes2361 viewsClose up view of the Genalex Gold Lion KT88 Vacuum Tubes. The amplifier topology is Push-Pull and built following Bruce's KT88 Push-Pull Class A DIY Tube Amp with 12SL7 Driver build. The extra tube is a 6NO30 which delays the B+ so the tubes have time to warm up.Aug 01, 2009
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Jan6418JewelBox.jpgRaytheon JAN6418 sub-mini valve preamp in a Jewelery box2240 viewsNot much to see here except to note this is an extremely "pretty" jewelery box of the timber variety. The box was reduced from $60 to $30 and this purchase prompted me to build the preamp. I like my pretty and cute enclosures. See other images for more detail. The preamp modules are part of a kit from Oatley Electronics Australia but many parts have been upgraded. The back holds a brushed Aluminum bar with the input/output RCAs and power switch. Should battery voltage fall below 6.8V (two lithium 9V batteries power the unit) a led on the cct. brd. will light. Lifting the gold catch and taking a look will disclose this.

The box is heavy and the wood thick and the Makassar timber pattern on the lid makes this a stunning enclosure, especially if you are bored with putting your creations into plain tin boxes. The preamp plays well but the tubes take a few hours to burn in so be warned.

Full details and variations to this tube preamp kit are available on the JAN6418 Valve (Tube) Preamplifier Kit page.
Jul 25, 2009
Jan6418JewelBoxInside.jpg
Jan6418JewelBoxInside.jpgInside the sub-mini Jewelery box preamp2634 viewsI have a weakness for "cute" enclosures, particularly timber ones. The mirror is just a bonus. The circuit board is part of a kit from Oatley Electronics Australia. I have replaced the carbon resistors in the kit with metal film, the 0.1uF MKT caps with 0.47uF polypropylene types, the 220uF electrolytic caps (output) with 470uF low ESR types. Also the PT2308 headphone driver chip was replaced with a Burr-Brown OPA2134 OP amp chip. 2 X 9V lithium batteries provide 9V to a L4949 regulator which controls filament current to the Raytheon JAN6418 sub-mini valves. Attenuation is trim set and volume controlled by external devices.

Three grommets are used as valve dampeners. These tiny valves can be extremely microphonic. Three grommets stops the microphonic problems dead! The amp is extremely quiet. See the JAN6418 Valve (Tube) Preamplifier Kit page for full details.
Jul 25, 2009
Jan6418JewelBoxRear.jpg
Jan6418JewelBoxRear.jpgJAN6418 Sub-mini preamp in a plush Jewelery box2056 viewsThe rear of the Jewelery box has a brushed Aluminum plate to hold the input / output RCA connections and on off switch. The wood was too thick to mount the RCAs directly. See other photos of this build for more info about the JAN6418 Sub-mini preamp.

Complete details about this low cost and low voltage tube amp kit are available on the 6418 Tube Preamplifier Kit page.
Jul 25, 2009
12AX7-Tube-Preamp-Kti-Enclosure.jpg
12AX7-Tube-Preamp-Kti-Enclosure.jpg12AX7 Tube Preamplifier Kit2450 viewsA finished photos of the 12AX7 Tube Preamplifier Kit. The volume control is an Alps pot salvaged from an old Sony amp. I added a second input and switch to allow multiple inputs. There is also a second out for a subwoofer.

The preamp is dead quiet and the sound is far more than I had hoped for. My spouse was skeptical, shall we say. But when she heard familiar music she was hearing things never heard before and the bass was thicker and richer. I heard a much bigger sound stage, sparkling highs. Very impressive. Thanks to Bruce Heran for all his help with this project.
Jul 21, 2009
12AX7-Tube-Preamp-Kti-Bottom.jpg
12AX7-Tube-Preamp-Kti-Bottom.jpg12AX7 Tube Preamplifier Kit - Bottom2572 viewsAn underside view of the 12AX7 Tube Preamplifier Kit . The chassis was made from scrap cherry wood finished with stain and varnish. The top plate is 2mm thick aluminum, from a metal fab shop. Jul 21, 2009
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JAN6418HPD_GalleryII.jpgRaytheon JAN6418 sub-mini valve headphone amp 2421 viewsThis shot shows the Oatley Electronics Kit in a small case to be constructed as a headphone amp/driver. The small cct. brd. is double sided, plated through, solder masked and screen printed. Construction is simple and this $AU27 kit makes an excellent first valve kit of any DIYer. See the other image for the completed headphone amp. The L4949 5V reg. chip lights the led for the first second it is on then only re-lights when the battery voltage falls below 6.8V. Nice touch. The reg chip supplies 5V to the filaments which are in series with a 270omh resister. The amp only draws 12mA. Two 9V lithium batteries power the unit. In the preamp version the PT2308 headphone driver chip was replaced with a Burr-Brown OPA2134. Excellent sound stage and rich bass. And it is a portable headphone amp!

There is more information available on the JAN6418 Valve (Tube) Headphone Amplifier Kit page.
Jul 15, 2009
JAN6418HPD_Gallery.jpg
JAN6418HPD_Gallery.jpgRaytheon JAN6418 sub-mini valve portable headphone amp2384 viewsJust when you thought you had seen it all something "different"comes along. This 9V valve front-end headphone amp/driver is based on a Oatley Electronics (Australian) kit. I built the kit stock standard and loved the sound. Then upgraded most parts to make a "Signature" strength preamp version. A L4949 5V regulator chip and PT2308 headphone driver come with the kit which also has two Raytheon JAN6418 sub-mini valves. As a preamp (replace the PT2308 with an OPA2134) or headphone amp the kit is excellent. I run both on two 9V lithium batteries in parallel.The amp only draws 12mA! Soundstage is excellent and bass rich and extended. The bandwidth is <10hz to 50Khz (-3db points).

See the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit project page for full details.
Jul 15, 2009
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