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two-stage-RIAA-phono-tube-preamp.jpgTwo stage tube phono preamp with RIAA equalization2574 viewsAfter building a number of diy jFet based phono preamps, on request from a friend, I built this two stage tube phono RIAA preamp. The circuit design is from the TubeCAD Journal and is one of the simpler designs on the site. The circuit construction is contained on veroboard (perfboard) and housed in extruded aluminum enclosures from Hammond. The external PS run from a 24VAC wall wart. A step-up tranni converts this to 260V and a two stage C-R filtering ensures clean power. The heater voltage is DC. Tubes are Golden Dragon 12AX7s. Russian PIO caps are used in the inter-stage coupling/output and Sprague orange drops for the RIAA stage. With my Grado Reference MM wood body cartridge this preamp sounds divine.
Mark - retro-thermionic
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6CA7_Tubes_in_Philips_EL6431_Amplifier.jpg6CA7 Tubes in a rebuilt Philips EL6431 Amp2550 viewsThe four 6CA7 (EL34) output tubes of the Philips EL6431 amplifier. See the other photos in the gallery and there is also more information and photographs in the 120 watt Philips EL6431 (EL34/6CA7) Tube Amplifier thread on the forum.
Alan (Canada)
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Super_Simple_Single_Stage_Tube_Preamp.jpg4S “The Black†Tube Preamp2550 viewsThis the third Super Simple Single Stage (4S) Tube preamp I have built. Dubbed “The Blackâ€. The schematic is quite different from the original. Thanks Matt. Best sounding so far and supporting a Golden Dragon 12AU7 tube. The preamp still runs from a 24VAC wall wart and same PS as the other two builds. Big bass and detailed mids.
See my post about The Black - 4S preamp MKIII for more information.
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Scott-299-Amplifier.jpgScott 299 Amplifier Rebuild2528 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)
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Philips_EL6431_Amplifier_Guitar_Amp.jpgPhilips EL6431 Guitar Amplifier Rebuild2520 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)
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6EM7-Single-Ended-Triode-Amp.jpg6EM7 Single-Ended Triode (SET) Amplifier2508 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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12au7_4S_preamp.jpg12au7 preamp2495 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.
http://www.retro-thermionic.blogspot.com/
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6EM7-SET-Amp-Dual-Monoblocks.jpgParis Duo - 6EM7 SET Monoblock Amps2495 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
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Lawrence-Audio-Cello-Violin-Speakers.jpgViolin and Cello Loudspeakers by Lawrence Audio2478 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
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BBAmpDriverFrontS.jpgRemote driver stage for Be Bamp in a tea box2421 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.
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lafleuraudio-X2-speaker.jpgLafleurAudio X2 Speaker2344 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.
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Orangutan-O-96-Oscar-2-way-Speakers.jpgOrangutan O/96 Highly Sensitive Speakers2325 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.
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Specimen-Little-Horn-Speakers-with-Fostex-FE108E-Sigma.jpgLittle Horn Speakers with Fostex FE108E Sigma Drivers2290 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.
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Spin-Clean-Record-Washer-System-MKII.jpgSpin-Clean Record Washer System (Mk II) Kit Contents2273 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.
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