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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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Scott-299-Amplifier.jpg
Scott-299-Amplifier.jpgScott 299 Amplifier Rebuild1777 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)
6SN7-6V6-SE-Black-Lace.jpg
6SN7-6V6-SE-Black-Lace.jpgBlack Lace - SE 6V6 Amplifier1755 views“Black Lace” - an all Australian tube amplifier with tubes from the 60’s. Miniwatt: 6V6 black glass, 6SN7 and 5U4. Old school build with PIO caps, solder from the 70’s with copper and carbon film resistors. See the forum thread Black Lace - 6V6 power amp, old school for more information.

Mark Houston – retro-thermionic
6EM7-SET-Amp-Dual-Monoblocks.jpg
6EM7-SET-Amp-Dual-Monoblocks.jpgParis Duo - 6EM7 SET Monoblock Amps1754 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
Lawrence-Audio-Cello-Violin-Speakers.jpg
Lawrence-Audio-Cello-Violin-Speakers.jpgViolin and Cello Loudspeakers by Lawrence Audio1750 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
Oatley-K272C-Headamp-Kit.jpg
Oatley-K272C-Headamp-Kit.jpgOatley K272C JAN6418 tube based headphone amp kit1670 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
lafleuraudio-X2-speaker.jpg
lafleuraudio-X2-speaker.jpgLafleurAudio X2 Speaker1642 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.jpg
Orangutan-O-96-Oscar-2-way-Speakers.jpgOrangutan O/96 Highly Sensitive Speakers1626 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.jpg
Specimen-Little-Horn-Speakers-with-Fostex-FE108E-Sigma.jpgLittle Horn Speakers with Fostex FE108E Sigma Drivers1584 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.
Class-D-SureElectronics-Amp-Inside.jpg
Class-D-SureElectronics-Amp-Inside.jpgClass-D Sure-Electronics Amplifier (Inside)1561 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
Class-D-SureElectronics-Amp.jpg
Class-D-SureElectronics-Amp.jpgClass-D Sure-Electronics Amplifier1539 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
Spin-Clean-Record-Washer-System-MKII.jpg
Spin-Clean-Record-Washer-System-MKII.jpgSpin-Clean Record Washer System (Mk II) Kit Contents1507 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.
Decware-inspired-EL84-amp.jpg
Decware-inspired-EL84-amp.jpgDecware inspired EL84 amp with attenuation1385 viewsThis is a Decware inspired EL84 power amp with attenuation. My twist was to make a it a EL84 SE UL (not triode). Also I upgraded the PS a little. One PS tweak was to use a Russian PIO 4uf cap as the first cap in the PS. Also the larger electros are all snubbed.

The inter-stage caps are Audio Note Tin foil, mylar and oil. The amp I called "Tamarisk" - just like how it sounds. The finished amp looks good and not too heavy. Sound is a big step up from my already great sounding 6V6 - Ozzie tube SE UL amp. On live classical every part of the music has a layer. There every instrument is heard in its own layer and decay, reveb etc also have their own layers.

Mark Houston – retro-thermionic

Forum Thread: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5385
6CY7-Stereo-Amplifier.jpg
6CY7-Stereo-Amplifier.jpg6CY7 Stereo Amplifier1234 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: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5222

6EM7-Single-Ended-Triode-Amp.jpg
6EM7-Single-Ended-Triode-Amp.jpg6EM7 Single-Ended Triode (SET) Amplifier1138 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: http://diyaudioprojects.com/Tubes/6EM7-SET-Amplifier/


Forum Thread: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5134

   
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