DIY Audio Projects Photo Gallery
 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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Class-D-SureElectronics-Amp.jpgClass-D Sure-Electronics Amplifier2201 viewsThis is my first DIY Class-D amplifier. The amp is based on a $30 Sure-electronics module. The amplifier modules requires only a 30VDC high current power supply because into 4 ohm it can produce 100Wpc. The enclosure is an off the shelf 2U 19” rack mount type. The power supply has an 18-0-18V, 9A toroidal transformer. A 10A rec bridge, some snubbing caps and 30,000 uF of stage caps make up the power supply. Two selectable inputs provide direct connection to the amp module or connection via an Alp pot and 4 Oz brass knob. Very crisp sounding with good detail... See the forum thread Class D 100W power amp for more information.

Mark Houston – retro-thermionic
Oatley-K272C-Headamp-Kit.jpgOatley K272C JAN6418 tube based headphone amp kit2186 viewsIn this build I used bituminized aluminum foil to line the ABS plastic compact enclosures and switched 6.5 mm stereo phone jacks. Only with both source and headphone plugs inserted and the press button switched “on” at the rear will power flow. Wire-wrap wire has been used in the signal path and the battery health LEDs have been brought out to the front of the enclosure. The sound appears to have better bass than previous models but the tubes will ring if struck.

For more info, see the
K272C Oatleys JAN6418 tube based headphone amp\preamp
thread in the forum.

Mark Houston – retro-thermionic
Philips_EL6431_Amplifier_Guitar_Amp.jpgPhilips EL6431 Guitar Amplifier Rebuild2174 viewsThis vintage Philips amp uses 4 x EL34/6CA7 tubes to obtain an output power of around 120 watts into an 8 ohm speaker. The supply voltage on this amplifier is 825 volts! I managed to rebuild and convert the Philips EL6431 into an instrument amplifier that I can hook my bass up to as well as play music.

There is more information and photographs on my rebuild in the 120 watt Philips EL6431 Tube Amp thread on the forum.

Alan (Canada)
Scott-299-Amplifier.jpgScott 299 Amplifier Rebuild2168 viewsThis is a picture of my 299 Scott Amplifier. I made the whole enclosure case using 1/2" (13 mm) aluminum. The knobs are made of one and 1-3/8" roll aluminum. The face plate is made from a piece of stainless steel with silk screened lettering. The Scott 299 amplifier was completely re- built from the ground up and it sounds great.

Thank you,
Ken Valeo (USA)
12au7_4S_preamp.jpg12au7 preamp2160 viewsIn this build I employed a single stage tube preamp to provide gain and volume control to my 3W 6AS7 SET amp. This preamp uses a 24VAC wall wart and by configuring a 24/240V step down tranni to work backwards I can gain 280VDC across the 12AU7. No hook-up wire is used in the amp cct. only component-2-component wiring. The preamp produces no hum or buzz. It extends to a deep rich bass and very natural mids and highs. The frequency response is flat from 10hz to 130KHz and square way performance is exceptional. There is more information in the Super simple single stage tube preamp thread on the forum.
6EM7-SET-Amp-Dual-Monoblocks.jpgParis Duo - 6EM7 SET Monoblock Amps2149 viewsAfter completing a dual mono 6EM7 integrated amp, at the request of an established customer, I built these 6EM7 monoblocks. No built in preamp or attenuated this time. The chassis are 2M thick cast Al, acid etch primed and top coated with epoxy enamel high gloss paint. Only the power tranni, 5Y3 and 6EM7 stand on the top plate. The 10W Edcor OPT and Hammond 5H choke are in the chassis. Gold speaker binding posts and single RCA are on the back. Also inside is a EMI power filter and a short power cord with male IEC power socket and an RF choke connect this Paris Duo to the mains. The PS has a two stage filter: CLCRC/RC which makes this 1.8W absolutely dead quiet. Wire-wrap wire (heavily twisted) connects the RCA to the 6EM7 and OPT to speaker biding post. Silver solder is used in the amp section. Great mid-range.

Mark - retro-thermionic
BBAmpDriverFrontS.jpgRemote driver stage for Be Bamp in a tea box2146 viewsTo increase the volume level of the Bread Board amp (Be Bamp) a driver stage was built. This is the original cct. used in the Merlot amps with some components upgraded. The is no volume control or input cap and pure silver wire used in the signal path. Russian Military caps (paper and foil) were used for the inter-stage caps. Low ESR caps used where possible. The timber box is bitumanized Al foil lined. Tube is a Russian 6N1P.

The Be Bamp can now deliver full volume to the point of clipping. Well short of clipping a high volume level can be obtained with large 91db sensitive 3-way tower speakers. With the driver stage being remote other driver stages can be matched to the power stage and share the power supply. This provides another level of experimentation and flexibility with the over-all system.
Lawrence-Audio-Cello-Violin-Speakers.jpgViolin and Cello Loudspeakers by Lawrence Audio2122 viewsThe Violin (outside) and Cello (inside) loudspeaker by Lawrence Audio on display at CES 2012. The uniquely shaped speaker look as good as they sound. The Violin speakers retail for $7500 while the Cello speakers are $20,000. For more details see the Cello Speakers - Lawrence Audio - CES 2012 post on our blog
lafleuraudio-X2-speaker.jpgLafleurAudio X2 Speaker2000 viewsThe LafleurAudio X2 Speaker on display at the 2011 Salon Son & Image show.

The speakers use a heavily braced curved speaker enclosure in a 2.5 way design and the total weight is 55 lbs each. The nominal impedance is 4 ohms, sensitivity is 90dB and the frequency response is noted at 45Hz to 20kHz.

For more coverage from the show, Salon Son & Image 2011 show coverage thread.
Orangutan-O-96-Oscar-2-way-Speakers.jpgOrangutan O/96 Highly Sensitive Speakers1978 viewsThe Orangutan O/96 High Sensitivity Speakers on display at the 2011 Salon Son & Image show.

For more information, see our show coverage: Orangutan O/96 High Sensitivity Speakers.
Specimen-Little-Horn-Speakers-with-Fostex-FE108E-Sigma.jpgLittle Horn Speakers with Fostex FE108E Sigma Drivers1949 viewsThe Little Horn Speakers produced by Specimen Products on display at Salon Son & Image 2011. The Little Horn Speakers use the Fostex FE108E Sigma driver.

For more information about the Little Horn Speakers, see our coverage from SSI 2011: Specimen Products Little Horn Speakers.
6CY7-Stereo-Amplifier.jpg6CY7 Stereo Amplifier1945 views"This is a nice little low power stereo amp (1.3W/channel) based on the 6CY7 tube. The amp uses a Hammond power transformer and chokes and a pair of Edcor XSE10-8-5K output transformers. I have to say that it sounds really nice. There is just something about triode SE amps that nothing can beat. The peak clean power output is 1.3 watts RMS per channel (as determined from watching an oscilloscope). The 3dB frequency response is ≈48 Hz to 30 KHz."

Matt Renaud
Pacific Northwest, USA
Project Thread:

Spin-Clean-Record-Washer-System-MKII.jpgSpin-Clean Record Washer System (Mk II) Kit Contents1894 viewsHere are the contents of the new Spin-Clean Record Washer System (Mk II) which is available for $80US. We have completed a full review of the Spin-Clean LP Record cleaning system. The Spin-Clean record cleaner is fully manual and does a very thorough job of cleaning your records.

See the Spin-Clean Record Washer System (Mk II) review for more information about the Spin-Clean.

If you have any questions about the Spin-Clean, you can ask them in the Spin-Clean LP Record Cleaning System (Mk II) thread on the forum.
6EM7-Single-Ended-Triode-Amp.jpg6EM7 Single-Ended Triode (SET) Amplifier1820 views"This amplifier is based on a tube intended to drive the vertical deflection circuits in larger televisions, the 6EM7. It has two dissimilar triodes in one envelope. One is a high gain, low power unit intended as an amplifier or oscillator, and the other is a higher power unit intended to drive the magnetic deflection coils on the back of a CRT. At audio frequencies the combination is just what we need to build a nice little audio amplifier. One tube per channel. And there are many thousands of these tubes and tubes like them readily available today."

Matt Renaud
Pacific Northwest, USA

Project Page:

Forum Thread:

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