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BattMMPreSmall-1.jpgMM Phono Preamp (battery powered) - inside5583 viewsThis is my second build of the Jaycar MM phono preamp kit I have completed. This time I wanted it to run from batteries. Three 9V lithium batteries in series provide 27V. A resistive network produces a virtual +/- 13.5V supply for the OPA2134 opamp chips. The cct. brd.(PCB) can very easily be wired so diodes and regulators are not required. No track (trace) cutting is required and only a few simple straps and two resistors are required. An Alps Blue Velvet pot and pure silver wire, silver solder and gold RCAs make this a quality build. Bitumanised Aluminum foil lines the lid and bottom of a sleek compact ABS plastic enclosure to form a smart looking excellent sounding MM phono preamp. See the additional images.
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K12G-Tube-Amplifier-Kit-Inside-Zach.jpgUnderside of Zach's K12G Tube Amplifier Kit5581 viewsThis is an underside view of the K12G tube amplifier kit put together by Zach. You can see that Zach has tried some of the various modifications noted for this kit.
For more information about this tube amplifier kit and possible modifications see the S-5 Electronics DIY Tube Amplifier Kits page
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Finished-LM3875-Gainclone.jpgFinished LM3875 Gainclone Enclosure5578 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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K-12G-Tube-Ampleifier-Kit-UK.jpgK-12G Tube Amp Kit build from UK5538 viewsHi this is my new build of an S-5 Electronics K-12G tube amplifier. I'm really proud of it and hope it can inspire others.
Transformer covers, knobs, feet, phono plugs and other parts sourced from http://www.mafaudio.com/.
The main transformer case was scratched and they will send another free with my next order. I've found them very easy to deal with. The case is made of pine bought at the local merchants with a plywood top. I used only simple tools.
There are more photos available in my photo library.
Luke Collings
Wiltshire, UK
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IMG_1876.JPGriverrat373's K-502 Tube Amp Kit - Rear5531 viewsBack side of the K-502 Tube Amplifier showing vent for transformer cover and hookups.
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K-12G-Tube-Amp-Kit-DIY-Enclosure.jpgK-12G Tube Amplifier Kit and DIY Enclosure5523 viewsForum member DisasterArea has put together a S-5 Electronics K-12G Vacuum Tube Amplifier Kit and built the kit into a fantastic looking enclosure using chassis parts from VT4C.
For more information about this tube amplifier build see this forum thread: First amp build: K-12G tube amp kit.
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Fostex-FE206En-Double-Bass-Reflex-Speakers.jpgFostex FE206En Double Bass-Reflex Speakers5516 viewsThe finish is satin black stipple and the grills are held in place with four rare earth button magnets. Easy to pop on and off. The stipple effect was produced with a roller going over the fresh paint a number of times as it dried. The drivers huge magnets have bitumanised aluminum foil dampening attached and the internal wiring is two stands of lightly twisted wire wrap wire to each binding post. The top chamber is lined (but not stuffed) with Dacron but the bottom chamber is empty. There is no crossover in these fullrange speakers. Efficiency is 96dB at 8ohms impedance so they work well with flea power tube amps. Sitting higher than the tweeter (wizzer cone) the sound is quite natural with just a touch of forwardness in the mid-range. The speakers not only look stunning they sound excellent for a $500 spend.
For full details see the Fostex FE206En Double Bass-Reflex Speaker project page.
Mark Houston – retro-thermionic
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K-12G-Tube-Amp-Rear.jpgK-12G Tube Amplifier Kit (rear view)5496 viewsRear view shot of Lofton's build of the S-5 Electronics K-12G Tube Amplifier Kit. More information and details about this build are available in the K-12G Tube Amp Kit Build Thoughts thread on the forum.
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DSCN0744.JPGCustomized K-16LS Tube Amplifier Kit5467 viewsAmong the many modifications, most notably I removed the pot and replaced it with resistors and an power indicator LED.
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Finished-AMP6-T-Amp-Back.jpgRear View - DIY Class-T (T-Amp) Kit5404 viewsHere is a rear view of the DIY AMP6 T-Amp kit.
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IMG_1875.JPGriverrat373's K-502 Tube Amplifier Kit - Side5347 viewsSide view of the K-502 Tube Amp Kit.
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IMG_1874.JPGriverrat373's K-502 Tube Amp Kit - Front5336 viewsFront view of the K-502 Tube Amplifier Kit with transformer cover.
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ZCA_2.jpgRadoslav's ZCA (SE class-A mosfet amp) 5327 viewsRadoslav has made a very professional looking build of the ZCA.
See the project page, DIY Class-A 2SK1058 MOSFET Amplifier for the schematic.
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E88CC-SV83-SET-Amplifiers.jpgDual SV83 SET Amplifiers5311 viewsA mirrored pair of SET amplifiers, presently being used in bridged mode. All P2P construction using silver solder. I included a "Hazen grid" capacitor and input tube bias change switch. The single mA meter displays individual output tube bias current with a Left/Right switch. Edcor XPRW178 power transformer and GXSE10-6-8K output transformers. Upgraded caps to Jantzen Audio 1200V Z-Superior. Upgraded resistors to PRP PR9372 Audio for metal film and TAKMAN REX for carbon film. ALPS Blue 100K attenuator. The power supply uses a RCA 5U4GB rectifier and Hammond 156R choke. Matched pairs of Svetlana SV83 for power and JJ E88CC for the input tube.
Billy Whiten - Georgia, USA
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Fostex-GK120-Speakers-with-F120A.jpgFostex GK120 Speakers with F120A5307 viewsHello - this is a hard to locate set of speakers! The cabinet is a rare speaker enclosure from Fostex - model GK120. The speaker in each cabinet is the famous F120A. The set operates flawlessly - both aesthetically as well as acoustically. The wood (though I do not know the type) is solid and very nice. The enclosures themselves are made of a see-through Lucite and are definitely a conversion piece.
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OatleyK281.jpgOatley Electronics sub-mini tube/chip amp hybrid K2815307 viewsThere has been a number of hybrids over the years but none more unusual than Oatley Electronics, of Sydney Australia’s, Jan6418/LM1875 kit amp. Not crazy enough for you? How about we throw in a 24VDC International regulated switch mode power supply and build the finished amp as a dual mono construction? Crazy? You expected less from Australian Justic Branko owner of Oatley? Still not crazy enough? How about the amp only puts out 5W. Yes the chip is capable of 20W easy! Think what you can do with this kit.
This is my dead stock, out of the box build. And it sounds bloody great! Good sonic depth with chip amp holographic sound stage and tight, exceptionally controlled bass. And all for AU$29 plus shipping. Nuts!!! Not crazy enough. I added twin UV LEDs on the front panel to indicate when both modules are powered. That’s Crazy.
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KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPGAMP6 Amplifier + Passive Linestage5283 viewsTripath T-Amp using a 41Hz Amp6 T-Amp module and a toroidal power transformer. The linestage uses a top quality rotary switch and Gold Point attenuator. More info and FPD files are available on my project page.
Cheers, Keith
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Wooden-5687-Valve-Preamp-Rear.jpg5687 Valve Preamp - Rear View5282 viewsMy second DIY 5687 Valve Preamp project. This one is housed in a wooden box.
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top1.jpgPush-Pull 6T9 Stereo Tube Amplifier5280 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
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Point_to_Point_Bride_of_Zen_Preamplifier.jpgBoZoaC - Bride of Zen on a Cap5275 viewsAfter building a number of Bride of Zen (BoZ) preamplifiers I realised the whole circuit could be built on larger parts of itself. Here the whole BoZ circuit is constructed on the large output capacitors. The output caps are 10uF 100V polypropylene types. These were taped together along with two 1000uF of low ESR storage caps. Parts have been reduced to minimum size to keep signal path short and super glued to the rest on the cct. Silver solder and wirewrap wire is used throughout construction. There are two switchable inputs and the preamp can be powered by internal batteries (3 X 9V lithium) or an external supply. A bitumen and Al lined, non-magnetic low resonance ABS plastic case was used. Mongrel Dog Audio
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