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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-12AU7-Cathode-Follower-Preamp.JPG
DIY-12AU7-Cathode-Follower-Preamp.JPGDIY 12AU7 Cathode Follower Tube Preamp3241 viewsA Foreplay inspired 12AU7 vacuum tube preamplifier. This is an all tube build, rectified with a 6X5GT, and regulated using an 0D3.

More details about my DIY 12AU7 Tube preamp.
Jun 22, 2008
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MicPreCct.JPGInside the diy microphone preamp6083 viewsThe cct. brd. for the ESP low noise two transistor mic preamp attaches to the lid of the this solid die-cast aluminum case. Batteries also are mounted on the cct. brd. This preamp is free from hiss and all noise and is the perfect partner for high quality low output mics. A more compact version could be constructed using electrolytic caps and AAA batteries (12V). But the quality would suffer a little with the inferior caps.Jun 18, 2008
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The_SetUp.JPGLow noise mic preamp5458 viewsAfter preforming an on street recording of a classical busker with my Cowon mp3 in Florence I decided I wanted to do more recording. The Sony ECM-MS957 stereo mic (not made any more) had too low output to drive my mp3 player line-in or laptop digitizer so I made this low noise, two stage transistor (BC549) preamp (red lid). Because I used large 10uf polypropylene capacitors to ensure high quality sound recordings the preamp, though portable with internal batteries (12V), is quite large. Now I can use my mp3 player (128kps) to make quality recordings anywhere. There is no hiss or processing noise at all. The preamp is dead quiet. The preamp from the ESP site and is extremely easy to build. I use silver wire and silver solder throughout and gold connectors where possible. You can use 10uF electrolytic capacitors where I used polies but for the very best sound use the polyester capacitors. The designer suggests this in his text.

Jun 18, 2008
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S5-Electronics-K12-Tube-Amp-Kit.JPGS-5 Electronics K-12 Tube Amplifier Kit5747 viewsThis is a S-5 Electronics K-12 Tube Amplifier Kit. I run a Cambridge Audio Azure 540C CD player into it and it feeds a pair of 70L 12" 3-ways - the classic '70's speakers - a kit from Macs Hifi ( no longer there) in Adelaide. They are very efficient as you would expect - and have been upgraded several times with new drivers and crossovers.Jun 08, 2008
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S5-Electronics-K12-Tube-Amp-Kit1.JPGS-5 Electronics K-12 Tube Amp Kit (220V)5398 viewsAnother S-5 Electronics Tube Amplifier Kit from down under. This one uses a 220V transformer from Gammatron at Salisbury. The amp is dead silent and has fantastic bass and the sound stage is better than anything I have heard.

Jun 08, 2008
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dscf1831.jpgFE127E FS Fonkens7902 viewsFull size Fonkens with the Fostex FE127E Fullrange Driver.Jun 07, 2008
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dscf1832.jpgFostex FE127E FS Fonkens6427 viewsDriver is the Fostex FE127E. Veneer is Beeswing Saples. A royal PITA to work with. Jun 07, 2008
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dscf1833.jpgFostex FE127E FS Fonkens6417 viewsHere is the setup in the basement. The new Audio Nirvana Super 12s are what are sitting on the Fostex FE127E Fonkens. I am breaking them in and will be building bass reflex cabinets soon.Jun 07, 2008
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FE167E.JPGFostex FE167E Fullrange Driver in Bass Reflex Enclosure6618 viewsI required some efficient speakers to compliment a small valve (6T9) amplifier which produced only a few watts. Here are the finished speakers. The enclosure design is the Fostex FE167E Recommended Bass Reflex Enclosure (15L). 18mm MDF was used which was glued and nailed together. The back panel (internally) has a layer of heavy sound absorbing vinyl glued to it and all internal walls have a thick layer of Dacron tacked to them. First impressions of the sound is very clear with strong transient response and pin point sound stage.Jun 07, 2008
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6T9FE167E.JPG6T9 Tube Amp and Fostex FE167E in Ported Enclosure.6867 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. Jun 07, 2008
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Finished.JPG"not another chip amp" - Enclosure3084 viewsThis is where most new amps end up for a few weeks burn in, sitting atop the NAD C542. This is my latest chip amp which I promised I would never build. I started and completed the amp in one day. The amp modules had been built a some time before so most of the hard work was marking and drilling then assembly. On start-up it had a bad hum which I have managed to reduce to a low level. See the other image ("not another chip amp") for the inside shot. This amp feels like it has the power to deliver big time and it certainly sounds nice enough. Will I make another chip amp? Stay tuned.Jun 05, 2008
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LidOff.JPG"not another chip amp"4170 viewsAfter the Synergy Gainclone amp I promised myself I would not make another chip amp. The point-to-point gainclone amp modules were made twelve months ago but never got used. They comprise of the LM3875 and 10,000uF caps. The PS is rated 160VA with a scavenged microwave mains filter and a snubbed rec. bridge. The amp is compact and very loud with a full and very extended bass with small bookshelf speakers. You feel this amp could power a whole night club. Well it fills this house with clear clean music! And that is how it sounds -> clear and clean!Jun 05, 2008
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DIY-Silver-Wire-RCA-Interconnect-Cables.JPGDIY Interconnect Cables with Silver Wire6516 viewsSimple DIY RCA interconnect cable project made using pure silver wire.

Related: DIY Silver RCA Interconnect Cables
May 30, 2008
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DIY-Audio-Silver-Wire-RCA-Interconnect-Cables.JPGDIY Audio Silver Wire RCA Interconnect Cables7385 viewsSimple DIY interconnect cables made with silver wire.

Related: DIY RCA Silver Interconnect Cables
May 30, 2008
ClubPreampComp.jpg
ClubPreampComp.jpgMelbourne Audio Club preamp comparison night equipment6299 viewsFor the preamp comparison my 12AX7 Tube Preamp and OP Amp Preamp were used. My Gainclone monoblocks were used for the power amps. The speakers in the other image were built by a club member also. An A/B switch was used to switch from one preamp to the other under a blind test situation. This allowed a quick comparison between the two very different preamps. Though the chip preamp was voted the better (60/40) many still expressed their preference for the valve preamp.May 25, 2008
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PreampComp.jpgMelbourne Audio Club - Preamp Comparison Night6736 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.May 25, 2008
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2SK1058-2SK1057-2SK1056-IRFP240-classA-Mosfet-Amplifier.png2SK1058 / 2SK1057 / 2SK1056 / IRFP240 Class A Mosfet Amplifier Schematic9944 viewsSchematic of Ivan's modified version of Mark's simple DIY 2SK1058 Mosfet Amplifier. This version uses a 12V / 20W light for the load resistor.May 21, 2008
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DIY-Class-A-Mosfet-Amp.jpgDIY-Class-A-Mosfet-Amp7074 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..May 21, 2008
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DIY-Class-A-Mosfet-Amplifier.jpgDIY Class A Mosfet Amplifier6611 viewsAnother variation of Mark's 2SK1058 Mosfet Amplifier. Here is a photograph of the inside of this DIY 2SK1058 Mosfet Amplifier project. May 21, 2008
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TSpecialUnderChassis.JPGUnderside view of the 6T9 baking pan tube amp3482 viewsThe OPTs and printed cct. brd. fit snugly in the thin baking pan chassis making a compact little amp. Drilling such a thin chassis has its challenges and getting all the drilled points to line up with cct. brd. mounting holes can be frustrating. This amp is a poor performer under the CRO but produces an astounding stereo image. It plays small classic quartets, jazz groups and most voice and piano based music well. You need at least 90dB efficient speakers that can go deep for good listening. See the 6T9 Tube Amplifier Project page for more info.May 19, 2008
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