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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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ProJect-Debut-III-Phono-USB.jpg
ProJect-Debut-III-Phono-USB.jpgPro-Ject Debut III Phono USB 5014 viewsI just read about this new turntable with a USB out.

This manual turntable has an integrated MM phono preamp with A/D converter and USB output. Retail price is expected to be about $550.

More info is available at their website: http://www.project-audio.com
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DSCN0744.JPGCustomized K-16LS Tube Amplifier Kit4947 viewsAmong the many modifications, most notably I removed the pot and replaced it with resistors and an power indicator LED.
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Wooden-5687-Valve-Preamp-Rear.jpg5687 Valve Preamp - Rear View4905 viewsMy second DIY 5687 Valve Preamp project. This one is housed in a wooden box.
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IMG_1874.JPGriverrat373's K-502 Tube Amp Kit - Front4864 viewsFront view of the K-502 Tube Amplifier Kit with transformer cover.
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K12G-Tube-Amplifier-Kit-Inside-Zach.jpgUnderside of Zach's K12G Tube Amplifier Kit4860 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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IMG_1875.JPGriverrat373's K-502 Tube Amplifier Kit - Side4856 viewsSide view of the K-502 Tube Amp Kit.
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K-12G-Tube-Amp-Rear.jpgK-12G Tube Amplifier Kit (rear view)4844 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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S5-K16LS-Tube-Amp-Kit-Mahogany.jpgK-16LS Tube Amp Kit (16W)4806 viewsThe S-5 Electronics K-16LS tube amplifier kit built into a Mahogany case. The tube amp kit was built with all the mods outlined in the forums here at diyAudioProjects.com. The circuit board was built with components (except the tube sockets) on the bottom side so just the tubes would be exposed. The front driver tubes is lit red with LEDs.

Charlie Mooradian
USA
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K-12G-Tube-Amp-Kit-DIY-Enclosure.jpgK-12G Tube Amplifier Kit and DIY Enclosure4801 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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KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPGAMP6 Amplifier + Passive Linestage4777 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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9pin-to-octal-adapter.jpg9 pin to octal tube adapter4769 viewsI wanted to verify that a 12AT7 was equal to a 6SL7 in the OD2.5. So this is an adapter made from an old octal tube base and a 9 pin socket. It worked and yes the tubes are interchangeable. I will check the frequency response and distortion and see if there is any difference, but sound wise they seem the same.
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2~0.jpg2SK1058 Single-Ended Class-A Amplifier. Retro style design.4762 viewsRetro style design Class-A power amplifier with zero negative feedback. It was built based on the schematic of DIY Class-A 2SK1058 MOSFET Amplifier project by Mark Houston.
For more pictures and details, please visit http://alexkap.com.
5-channel-LM3875-chipamp.jpg
5-channel-LM3875-chipamp.jpg5 Channel LM3875 ChipAmp / Gainclone Amplifier4754 viewsI was looking for a simple way to integrate 5.1 surround sound into a projector / PC based home theater a while back and then the idea hit me, I had just finished a 2 channel gainclone for my PC desktop with phenomenal sound. So here is my incarnation of a 5 channel gainclone. The case is custom, cherry front and back sections and plate Aluminum for sides, bottom and top. The heatsink was a leftover from an Advanced Energy RF amp. It is driven from an SB Live sound card. See the other photos.

See the gainclone amplifier pages for more chipamp ideas.
OatleyK281.jpg
OatleyK281.jpgOatley Electronics sub-mini tube/chip amp hybrid K2814751 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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Fostex-FE206En-Double-Bass-Reflex-Speakers.jpgFostex FE206En Double Bass-Reflex Speakers4739 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
ZCA_2.jpg
ZCA_2.jpgRadoslav's ZCA (SE class-A mosfet amp) 4737 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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top1.jpgPush-Pull 6T9 Stereo Tube Amplifier4714 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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Sansui-SR-1050C-Fully-Manual-Turntable.jpgSansui SR-1050C Turntable4713 viewsA Sansui SR-1050C, fully manual phono turntable.

I did the following mods to it:

1- Installed a new Shure m350ed cartridge
2- Replaced the belt
3- Added a belt strength regulator screw (the original design didnt have it)
4- Replaced the RCAs with gols plated ones
5- Replaced the Saprk Killer cap with X2 cap.
6- Installed ferrite chokes on audio and power cable.
7- Installed an EMI-RFI filter

It sounds and works great now.

Bernardo
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LM3875-Gainclone-Chip-Amp-I.JPGLM3875 Gainclone Raosting Pan / Chip Amplifier4697 viewsThis is my first LM3875 Gainclone / Chip Amp. It was constructed following some of the notes from this LM3875 Gainclone / Chip Amp in a Roasting Pan. The volume control (potentiometer) is an ALPS Black Beauty. All soldering was done using silver solder. The bridge rectifier and capacitors are all snubbed with small, but good quality capacitors.
KT88-Single-Ended-Tube-Amp.jpg
KT88-Single-Ended-Tube-Amp.jpgKT88 Single Ended Tube Amp - Inside View4696 viewsInside view of my KT88 Single Ended Tube Amplifier projct. The circuit is just like Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier.

For the power supply I used some UF5408 diodes for the B+ and 6A10 for the heaters (they are on a heat sink as they dissipate a lot of power). Bypass capacitors for the driver stage are Rubycon ZL and for the power stage Nichicon. The B+ is lower to improve tube life.

More information and pictures are available on my build log: SE KT88 Tube Amp.
614 files on 31 page(s) 15


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