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DIY Audio Projects DIY Audio Forum DIY Audio Photo Gallery DIY Audio Blog NEW Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization . DIY Audio Projects DIY Tube Projects DIY Tube Amp Kits DIY Speaker Projects Speaker Drivers / Tweeters DIY Solid State Projects DIY IC / Op-amp Projects DIY Phono Projects DIY Cable Projects Misc. Audio Projects Hi-Fi Audio Schematics Technical Audio Information Testing Equipment / Tools DIY Audio Links Contact / About Us DIY Audio Projects - DIY Hi-Fi for Audiophiles DIY Audio Projects Do-It-Yourself (DIY) Audio Projects - projects for audiophiles, hi-fi enthusiasts, music lovers, electronic hobbyists, woodworkers and those who like to learn, build and listen to music. This site exists to promote the hobby of DIY Audio. There is nothing for sale here. All project documentation presented on this site is free for personal non-commercial use. If you have a DIY Audio Project that you would like to share with others through this site, or if you have any comments, contact us or post a message on the DIY Audio Projects Forum . Questions about a specific projects can be sent to the project author noted at the top of the project page. If you are new to DIY Audio but want to learn more, take a look at our DIY Audio Book recommendations. Last update: 10 November 2019 Follow DIY Audio Projects Share DIY Audio Projects These are some of our featured DIY audio projects. For more DIY projects, use the navigation menu on the left hand side of the page. High Fidelity Tube Junk Box Audio Amplifier - 10 November 2019 NEW Bruce Heran outlines the design and construction of a High Fidelity Tube Junk Box Audio Amplifier (JBAA). The schematic is similar to the PoddWatt design and able to use a huge variety of tubes. The JBAA tube amplifier can use a 12AX7, 12AU7, ECC82, ECC83, 5751, 12SL7 or 6SL7 in the driver position while 6V6, 6AQ5, 6005, 6Y6G, EL84, 6BQ5, 6F5P, 6P15P-EB, 6Y6GA, 6K6, 6W6, 6GV8, 6BM8, ECL82 or ECL85 can be used for the output tubes. The circuit is biased into Class-A, ultra-linear operation and output power will be dependent on the tubes utilized. 6CY7 Single-Ended Triode (SET) Amplifier - 30 July 2016 This inexpensive Single-Ended Triode (SET) amp is built around a pair of 6CY7 vertical deflection dual triodes built for TVs. At full output the amp produces a clean 1.3 Watts output per channel into 8Ω. The Edcor XSE output transformers are rated from 70Hz to 18kHz. This amplifier did a little better than this having a -3dB bandwidth from about 46Hz to about 30kHz. The 6CY7 stereo amp uses a 6CA4 tube rectified power supply with excellent channel separation. Matt reports: This is quickly becoming my favorite amp. I currently have a set of NOS Sylvania tubes in it, but I have also used a set of old used GE tubes which sound just as good. I highly recommend that anyone looking for a little iPod or computer amp give this one a try. DIY JFET MC Pre-Preamp Kit - 19 Sept 2015 KIT Low Voltage This is the Boozhound Laboratories JFET Moving-Coil (MC) Pre-Preamp Kit. The MC pre-preamp kit consists of a PCB, standoffs, the circuit parts and building instructions. The builder will need to provide a 12-24VDC power supply, an enclosure and miscellaneous hardware like connectors and switches. The kit uses 2SK170 JFET transistors and comes with fabulous vintage Russian military paper-in-oil (PIO) capacitors. Mark uses 9V batteries for the power supply and is very pleased with the results. 6EM7 Single-Ended Triode (SET) Amplifier - 29 June 2015 Matt describes the design and construction of a Single-Ended Triode (SET) amplifier built around a pair of 6EM7 double triode tubes. The clean output power from the 6EM7 SET amplifier is about 2.2 Watts per channel with a frequency response that matches the audio output transformers. The single-ended 6EM7 amplifier is housed in a vertical wooden chassis that has been styled after early vacuum tube equipment of the 1920s. The 6EM7 SET amplifier uses a 6CA4 tube rectified power supply with excellent channel separation and which is very quiet. Matt reports that the 6EM7 amplifier sounds wonderful! The bass is well articulated without being boomy, mid-tones are clear and even, and the highs are crystal clear . Fostex FE206En in Back-Loaded Horn Speaker Cabinets - 1 September 2014 Once again Mark tries on the Fostex FE206En high sensitivity fullrange driver, but this time the end result is a large elaborate back-loaded horn loudspeaker. The speaker cabinet plans are from the FE206En driver datasheet. The horn loudspeaker cabinets are made from 21 mm thick pine plywood and use a single FE206En fullrange driver and no crossover. Australian beeswax is used on the outside of the horn cabinet and heavy cedar oil was applied to the mouth of the horn. The sensitivity of the FE206En driver is greater than 96 dB / 1W / 1m, so the rear-loaded horn speakers are very well suited for use with very low power tube amplifiers. Mark reports that the horn speakers can draw an extremely accurate soundstage, sound excellent and have lead to a whole new listening experience with Paris, a 2.5W 6EM7 SET amplifier. Gobo LM1875 Stereo Amplifier Kit - 21 July 2014 The Gobo Stereo Amplifier kit is a class-AB chip amp kit based around the LM1875 IC. This is a complete amp kit that includes all the necessary parts and enclosure to build a stereo amplifier. The LM1875 amp kit comes with audio-grade capacitors and toroidal transformer. The Gobo amplifier kit is easy to build, looks and sounds great. The amplifier kit is well suited to first time amp builders. DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier - 24 March 2014 This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. As a thank you for the 300B amplifier schematics, Stamou has shared his implementation of the 300B single-ended tube amplifier schematic by J.C. Morrison. The 300B SET amp uses a 6SN7 direct coupled driver stage and an all low mu triode array. The power supply filtering sections have been duplicated for each channel for this 300B triode amplifier and premium parts are used throughout. The audio output transformers are Lundahl LL1623. This is a great sounding 300B triode amplifier that I am sure DIYers will find very rewarding. 4S Universal Preamplifier for 12A*7 Tubes - 15 December 2013 The 4S Universal preamp is a Super Simple Single Stage (4S) line level Hi-Fi preamplifier that works well with the entire range of 12A*7 tubes - 12AU7, 12AV7, 12AY7, 12AT7, 12AZ7, and 12AX7. You can change the tube type to vary the sound and gain considerably. The preamp uses a 6CA4 tube rectified power supply which is very quiet. The Universal preamp is fun as it allows tube rolling to compare various tubes in your stash. This is a great simple preamplifier unit to bring out the most in your power amps. Fostex FE103En Bass Reflex Bookshelf / Nearfield Monitor Speakers - 14 Apr 2013 Gio has put together a small bookshelf / monitor speaker using a single inexpensive fullrange speaker driver. The enclosure is a 6.9 L bass reflex cabinet tuned to about 95 Hz that follows the speaker box plans included with the driver datasheet. The loudspeakers use a single Fostex FE103En fullrange driver with no crossover circuit. The speakers work well as nearfield monitors and combined with a subwoofer the speakers can be used for home theater duties. DIY 6DJ8 (ECC88) Tube Headphone Amplifier - 24 November 2012 This low power tube headphone amplifier project comes from Bruce Heran. The simple tube headamp uses one 6DJ8 (ECC88) tube per channel. The amplifier circuit is push-pull and biased into class-A operation with a CCS. Gain is sufficient that no driver stage is required for the tube amp. The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones. Output power is over 100 mW between 32 ohms to 300 ohms. The response is 20 Hz to 28 kHz within 0.5 dB and the w...