DIY Audio Projects Forum

DIY Tube Projects
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Author: [ 28 Jul 2008, 00:53 ]
Post subject:  DIY Tube Projects

A new DIY Audio Project has been added to the site. Mark (in Australia) has been keeping busy and has put together a small single-ended 6T9 Tube Amplifier. He reports good results when this little amplifier is mated with a pair of high efficiency Fostex speakers. See his project page for more details.


Link -

Author: [ 04 Sep 2008, 20:34 ]
Post subject:  Ultra-Linear Modifications for 6T9 Vacuum Tube Amplifier

Mark's Ultra-Linear Modification for 6T9 Vacuum Tube Amplifier have been added to the website. See the Ultra-Linear 6T9 DIY Tube Amplifier page for more information about the modifications.


Also, here is Mark's DIY 6T9 Pentode Tube Amplifier Project.

Author: [ 29 Oct 2008, 19:39 ]
Post subject:  The Odd Blocks - KT88 Push-Pull Mono Block Tube Amps

We have added Bruce's second follow up to his original "OddWatt" (EL84 PP tube amplifier project). His latest creations are the "Odd Blocks" which are a pair of Push-Pull Mono Block Tube Amplifiers. Like the "Oddwatt 225" (KT77 PP Tube Amp), these mono blocks are scalable and can be used with a number of the octal tubes (KT77, EL34, 6CA7, 6L6GC, KT88, 6550, KT90). Like the previous projects the driver stage is an SRPP but this time Bruce uses the 12SL7 tube. The output stage is Class A Ultra-Linear self-inverting push-pull (SIPP) with Gold Lion KT88 tubes. LM317HV Regulators are used for the cathode CCS.

For full details about this project, see Bruce's "Odd Blocks" article: 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp.

Discussion and questions about this project are welcome in the Oddwatt Push Pull Tube Amplifier Projects thread.

Author: [ 24 Nov 2008, 20:44 ]
Post subject:  12AU7 Tube Preamplifier Project

Just added to the site is Alan's very simple build of a 12AU7 Tube Preamplifier Project. This simple project can be built with little cost especially if you have a couple of 12V transformers which can be placed back to back.

For full details about this project, see Alan's article: DIY 12AU7 Tube Preamplifier Project.

Please note that in order to see the changes on the main site pages, you may need to "Refresh / Reload".

Author: [ 19 Oct 2009, 15:08 ]
Post subject:  5751 SRPP / EL84 (6BQ5) PoddWatt Tube Amp Project

Bruce was kind enough to share another of his OddWatt Tube Amplifier designs with us. This one is similar to the first OddWatt project from about two years ago. The output stage of the amp is very simple and clean using EL84 / 6BQ5 tubes in a self-inverting push-pull (SIPP) topology which is driven by a 5751 SRPP input stage. The gain is high enough to allow direct connection to a portable mp3 player.


See the PoddWatt 5751 SRPP / EL84 (6BQ5) Push-Pull DIY Tube Amplifier project page for full project details.

Author: [ 30 Nov 2009, 20:04 ]
Post subject:  Review of the OddWatt Audio Monoblock KT88 Tube Amp Kits

Just added to the site is a review of the OddWatt Audio 5751 SRPP / KT88 Monoblock Tube Amp Kits.


See the project page: DIY monoblock KT88 Tube Amplifier Kits for full details.

Author: [ 09 Feb 2010, 19:13 ]
Post subject:  6L6 / 5881 Single-Ended Tube Amplifier

Just added to the site is a fantastic looking 6L6 / 5881 Single-Ended Tube Amplifier put togther by Mr. Chey in Thailand.


See the project page: DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier for full details.

Author: [ 22 Aug 2010, 23:29 ]
Post subject:  ForeWatt: ECC802S (12AU7 / ECC82) Tube SRPP Preamplifier

Our friend Bruce of OddWatt Audio has shared his ForeWatt ECC802S Tube SRPP design with us - Thanks Bruce!

Gain: 7 (17 dB) or 11 (21dB).
Tubes: ECC802S, 12AU7, ECC82 and variants
Power Supply: Solid State
Heaters: DC


Project Link - ForeWatt: DIY ECC802S (12AU7 / ECC82) Vacuum Tube SRPP Preamplifier

Support / Update Thread - ForeWatt Tube SRPP Preamplifier - Support / Update Thread

Author: [ 29 Sep 2010, 16:30 ]
Post subject:  Parallel push-pull 300B tube monoblock amplifiers

Rudolf Moers has put together a pair of parallel push-pull 300B tube monoblock amplifiers and he shares the design with the DIY community.


Details and schematics of Rudolf Moers Parallel push-pull 300B vacuum tube monoblock amplifiers.

Author: [ 02 Nov 2011, 00:14 ]
Post subject:  Groovewatt - DIY Valve RIAA Phono Preamp Project

The latest project from Bruce's is the Groovewatt, a tube RIAA phonograph preamplifier design. The phono preamp uses a solid state HT power supply and DC for the heaters. Gain of the phono preamp is 45 dB which is sufficient for use with high output MC cartridges. The phono preamp uses two 12AX7 SRPP gain stages, passive RIAA equalization and a 12AT7 cathode follower output stage.

Project Link - Groovewatt - (12AX7 / 12AT7 Tube RIAA Phono Preamp project.

Support / Update Thread - Groovewatt - tube RIAA phono preamp forum thread

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