KT88 Single Ended Tube Amp

Alex has put together a single ended (SE) KT88 tube amp. His design was based around Mikael Abdellah's KT88 SE Tube Amplifier design from 2003. Alex has made some changes, such as the ability to switch the amplifier between triode and ultra-linear operation. A picture of his finished KT88 tube amp is shown below.


Alex has done some experimentation with different tubes. EL34 tubes can be used in place of the KT88 valves. The preamplifier tube is a 6N1P, but the 6DJ8 / ECC88 / E88CC family of tubes can be used instead. The power supply uses a 5U4-GB dual rectifier tube.

For additional information, pictures and schematics, see the complete page of Alex's DIY KT88 Single Ended (SE) Tube Amplifier project.

Related DIY Audio Tube Projects:

• Bruce's EL84 Push Pull Tube Amplifier
• Bruce's KT77 Push-Pull Tube Amplifier
  
• Bruce's KT88 Push-Pull Tube Amplifier
  

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diyAudioProjects.com Updated

The DIY Audio Projects website has been updated with a new template and some new categories. The general layout of the website has remained the same, but the new template should load quicker and cleanly across all browsers. The previous template did not load on some MAC browsers. To improve navigation through the site, a navigation bar has been added near the top of the page.


There is some new information on the site which includes:

• DIY Audio Schematics
• DIY Audio Technical and Reference Information
  

For the time being, new content is limited to some NAD schematics and a short page on Aperiodic Speaker Enclosures. However, some new projects and additional information will be added shortly.

Comments and suggestions are always welcome.

Cheers,
Gio.

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Tobler-ONE: Jordan JX92S MLTL Speaker

Here is a fine looking Mass Loaded Transmission Line (MLTL) loudspeaker enclosure for the Jordan JX92S fullrange driver that has been put together by Francesco. The enclosure cross-section is trapezoidal and thus this speaker lends itself very well to corner placement. With the tall and narrow baffle, combined with corner placement, this loudspeaker has a high WAF, while not sacrificing the low frequency response.

To match the room decor, the enclosure has been constructed using beech plywood. The result is a fine looking loudspeaker with aesthetic appeal and great sonic qualities. Fantastic work Francesco.

For more information about this DIY Speaker Project, see the Tobler-ONE: DIY Jordan JX92S T-Line, single driver loudspeaker project.

Additional Jordan JX92S DIY Speaker Projects:

• DIY Jordan JX92S Sealed Bookshelf Speakers
• DIY Jordan JX92S Bass Reflex Speakers
  

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"Beauty" - A 12AX7 Tube Preamplifier

To accompany his recent LM3875 DIY Chip Amplifier (gainclone) project, Bruce has put together a DIY 12AX7 Tube Preamplifier Kit to drive the chip amp. He has named the tube preamp "Beauty", as it sweetened the sound of his LM3875 Chip Amplifier.


For the enclosure, Bruce used a readily available plastic and aluminum project box from Radio Shack. This is the same enclosure he used for the LM3875 Chip Amp. The photograph below shows the Tube Preamp and Chip amp together.


Similar to what Mark discovered with this economical (read dirt cheap) tube preamplifier kit is that you get a very quiet preamp that can compete with ones that cost much more. For more information about this project, see Bruce's project page, "Beauty" - A DIY 12AX7 Tube Preamplifier Kit.

Related Post:

• Mark's DIY 12AX7 Tube Preamplifier Kit

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