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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-Seas-Granite-Speakers.jpg
DIY-Seas-Granite-Speakers.jpgGranite Speakers with Seas Drivers5244 viewsThese unique looking speakers are housed in a bass reflex enclosure constructed out of black granite. The enclosure size is 15L and tuned to 45 Hz. The drivers, G17REX/P woofer and Seas 27 TFFC tweeter are from Seas. The crossover is second order at 2500 Hz. See the project page: DIY Granite Loudspeakers with Seas Drivers for more information.
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Nigel-K-12G-Tube-Amplifier-Kit-Build~1.jpgK-12G Tube Amplifier Kit Build5229 viewsNigel's build of a K-12G Tube Amplifier Kit.

For full details of Nigel's build, see his K-12G Tube Amp Kit Build thread.
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Mill_2.JPGRear View of the DIY OTL Tube Amps 5223 viewsThe chassis of my amps were machined in this German Milling machine - a real beast . It had to be repaired at a few stages just to complete the build. You can see the torodials that are used for the Driver stage ( smallest ) ..The Heaters ( next largest 6.3vac @ 32A ) and the Output Power supply ( the largest toroid - 1KVA @ 100 VAC )
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IMGP2958~0.JPGLME49810 with ThermalTrak NJL3281D/1302D output devices5217 viewsThis is a chip amplifier (chipamp) based on the National Semiconductor LME49810 high-performance, high fidelity audio power amplifier driver chip. The output stage is a conventional emitter following using ThermalTrak to achieve good thermal tracking.
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DIY-Granite-Speakers.jpgDIY Granite Speakers5204 viewsThese are granite speakers that Radoslav from Slovakia has put together. The bookshelf sized loudspeaker uses the Seas G17REX/P woofer and Seas 27 TFFC tweeter with a 2nd order XO at 2500 Hz.

For full details, see the DIY Seas Granite Speaker project page.
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DSCF0797-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier5181 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
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SV100870.JPGOP Amp Preamp - from the rear5173 viewsFrom the rear of the case you can see the power connection (for 18V 1.2A regulated wall wart) gold output and input connections. More information for this diy audio project is available at the DIY OPA2134 Preamp Project page.
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DSCF0800-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier5126 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
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DSCN0746.JPGK-16LS Customized Tube Amplifier Kit5116 viewsAdded silicone dampers to the tubes and upgraded the lamp-switch power cord to an IEC jack.
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AMPBOTOM.jpgS5 Electronics K-12M Tube Amp Kit - underside5110 viewsUnderside view of top plate. This tube amp is built from an S-5 Electronics K-12 Tube Amplifier Kit.
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2nd_monoblock.JPGUnderbelly shot of the DIY OTL Tube monoblock5011 viewsStrangely enough , the second was made intentionally Mirror Image , but I had neglected the fact that the Toroids had the same winding tail positions , so the build wasn't perfectly mirror image after all . This actually was a bit of a headache , since the first was more ideally layed out in electrical design & visual eye candy
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Finished-LM3875-Gainclone.jpgFinished LM3875 Gainclone Enclosure4971 viewsThe finished enclosure for my LM3875 Gainclone. The enclosure is from Jaycar and was $15. See the other pictures for more info.
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DIY-5687-Tube-Preamplifier.jpgDIY 5687 Tube Preamplifier4967 viewsThis is my first DIY 5687 tube preamplifier. Sounds great for such a simple preamp. Front view.
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Stereo_and_Seas_FA22RCZ_in_Open_Speaker_Enclosure.jpgSeas FA22RCZ Fullrange Speakers4961 viewsShown in the photo is my hi-fi stereo setup with and new pair of open cabinet speaker which I built. The diy speakers use a single Seas FA22RCZ driver per cabinet. The Seas FA22RCZ is a 200 mm (8") diameter fullrange driver with a sensitivity of about 94dB. The cabinet has an open bottom, see the Seas FA22RCZ Fullrange in Open Speaker Cabinet photo for more details.

The sound is very clean, open and free of compression artifacts, similar to open baffle speakers. Nevertheless, it has a satisfying bass depth.

See my blog for more information. It is written in German but you can use the Google translate tool on the right side of the page to translate.

Kind regards,
Carsten Bussler from Germany
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12AX7-Tube-Preamp-Kit.jpgDIY 12AX7 Tube Preamplifier Kit4958 viewsThis is my build of the Silicon Chip Magazine 12AX7 DIY Tube Preamplifier Kit. All of the coupling capacitors were upgraded to Auricaps. The volume control is an ALPS pot from Radio Shack
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EL84-Single-Ended-Tube-Amp.jpgTesting a DIY SE EL84 Tube Amp4956 viewsHere I am testing the Single Ended EL84 Stereo Amplifier. The whole AMP fits on a 100 by 160 mm DIY PCB. A double triode ECC88 / 6DJ8 or ECC82 tube is used to amplify the input signal. See other photo for the finished amplifier and more details.
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K-16LS-Tube-Amplifier-Kit-Modifications.jpgK-16LS Tube Amplifier Kit with Modifications4955 viewsHere are a couple of photos of Andy's K-16LS Tube Amplifier Kit. The enclosure is a Hammond 16" x 8" x 3" aluminum chassis. The original audio output transformers are 5K6 OPT's from an ELLA amplifier. For more information about Andy's build and modifications, see his webpage.

More information about these kits is available at the S-5 Electronics Tube Amp Kit page.
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DIY-Turntable.jpgDIY Turntable with Dual 701 Direct Drive Motor4950 viewsThe DIY turntable is built around the drive motor assembly from a Dual 701 record player. The plinth is built up by stacking plywood pieces. The tonearm is made from scratch following a complicated magnetically stabilized pick-up design.

For full project details see the DIY Turntable project page.
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K12G-Tube-Amplifier-Kit-Zach.jpgZach's K12G Tube Amplifier Kit4940 viewsFront and rear views of the K12G Tube Amplifier Kit put together by Zach.

For more information about these inexpensive tube amp kits, see the S-5 Electronics DIY Tube Amplifier Kits page.
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Velleman-DIY-Audio-Kits.jpgTwo inexpensive Velleman kits4927 viewsA preamp & amplifier kit that I'm going to combine to make a small integrated amp.
The preamp has volume and separate bass & treble controls.
The amplifier uses a TDA1521 IC.
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