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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 4774 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
Wooden-5687-Valve-Preamp-Rear.jpg
Wooden-5687-Valve-Preamp-Rear.jpg5687 Valve Preamp - Rear View4746 viewsMy second DIY 5687 Valve Preamp project. This one is housed in a wooden box.
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DSCN0744.JPGCustomized K-16LS Tube Amplifier Kit4713 viewsAmong the many modifications, most notably I removed the pot and replaced it with resistors and an power indicator LED.
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IMG_1874.JPGriverrat373's K-502 Tube Amp Kit - Front4670 viewsFront view of the K-502 Tube Amplifier Kit with transformer cover.
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IMG_1875.JPGriverrat373's K-502 Tube Amplifier Kit - Side4659 viewsSide view of the K-502 Tube Amp Kit.
9pin-to-octal-adapter.jpg
9pin-to-octal-adapter.jpg9 pin to octal tube adapter4616 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.4571 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.
K-12G-Tube-Amp-Rear.jpg
K-12G-Tube-Amp-Rear.jpgK-12G Tube Amplifier Kit (rear view)4557 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.
5-channel-LM3875-chipamp.jpg
5-channel-LM3875-chipamp.jpg5 Channel LM3875 ChipAmp / Gainclone Amplifier4539 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.
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KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPGAMP6 Amplifier + Passive Linestage4535 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
LM3875-Gainclone-Chip-Amp-I.JPG
LM3875-Gainclone-Chip-Amp-I.JPGLM3875 Gainclone Raosting Pan / Chip Amplifier4533 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.
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LM3875-Gainclone-Chip-Amp-TF.JPGLM3875 DIY Gainclone / ChipAmp4522 viewsThe front view of my LM3875 Gainclone project. The layout and idea is from the LM3875 Gainclone in a Roasting Pan. The power transformer on top is from an old Yamaha subwoofer that quit working. Power supply capacitors are four 6800 uF and two 4700 uF which are snubbed. Power switch, LED and volume control are at the front.
K12G-Tube-Amplifier-Kit-Inside-Zach.jpg
K12G-Tube-Amplifier-Kit-Inside-Zach.jpgUnderside of Zach's K12G Tube Amplifier Kit4522 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
OatleyK281.jpg
OatleyK281.jpgOatley Electronics sub-mini tube/chip amp hybrid K2814514 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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LM3875-Gainclone-Chip-Amp-TR.JPGLM3875 Gainclone / Chip Amp with Baking Pan Enclosure4505 viewsThis LM3875 Gainclone was built following the basic idea around the LM3875 Gainclone in a Roasting Pan. The power transformer is from an old Yamaha subwoofer that stopped working. The power supply consists of four 6800 uF and two 4700 uF capacitors.
EL84-Push-Pull-Inside.jpg
EL84-Push-Pull-Inside.jpgDIY EL84 Push-Pull (PP) Tube Amplifier4503 viewsEL84 Push-Pull Tube Amplifier constructed following Bruce's DIY EL84 Push-Pull Tube Amplifier Project documentation.
KT88-Single-Ended-Tube-Amp.jpg
KT88-Single-Ended-Tube-Amp.jpgKT88 Single Ended Tube Amp - Inside View4500 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.
ZCA_2.jpg
ZCA_2.jpgRadoslav's ZCA (SE class-A mosfet amp) 4497 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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SV101481.JPGSubwoofer Analogue Processor4475 viewsThis OP amp based subwoofer processor is a kit available from the local Jaycar electronics shop. There is a lot of soldering and construction so it is not hard to miss a few solder joints. I did. On the first few listens I can see there is a lot of tuning and balancing to be had. I am using a monoblock chip amp / gainclone to provide the final power.
Sansui-SR-1050C-Fully-Manual-Turntable.jpg
Sansui-SR-1050C-Fully-Manual-Turntable.jpgSansui SR-1050C Turntable4475 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
614 files on 31 page(s) 15


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