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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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6V6_PP_1_S.jpg
6V6_PP_1_S.jpg6V6 PP, 6SL7 LTP Driver - Phase Splitter3625 viewsAnother try to small power PP AMPS. 6SL7 in frint in LTP configuration, using IXYS 10M45s as current sink at 1.2mA.
Output tubes are set with a fixed bias, using a separate and negative voltage power supply.
A nice sounding amplifier which provides about 10.5 Watts at 1.5 % THD. This amp uses Hammond OPT's and a PSU choke.
chipamp-gainclone-amplifier.jpg
chipamp-gainclone-amplifier.jpgDIY Chipamp / Gainclone Amplifier3616 viewsThis is the diy enclosure for my 5 channel gainclone project. The five channels are powered by an external transformer that was borrowed from an old Fisher receiver. The amplifier is It is driven directly from an external SoundBlaster Live audio card. The cost of the whole setup, was under $100.

See the gainclone page for more amplifier ideas.
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Claravox-Dogma.jpgClaraVox Dogma Loudspeakers3607 viewsVery modern looking setup. If you think it looks expensive, they are $59,000 a pair for the speakers only! I wonder how well they image with the tweeter so far away from the mid?

Website: http://www.dgfdesign.it
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MerlotJJSGallery.jpgretro-thermionic Merlot Amp with JJ KT88 Blue Glass3597 viewsNot meaning to hog the Gallery at the moment but lots of development underway with my Merlot KT88 SE UL valve amps. I'll make it short: This is the Merlot amp with matched a pair of JJ KT88 Blue Glass. Sound: weightier bass and sharper mids but the JJs are only hours old.
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ECL86_SE.JPGECL86 Single-Ended Amplifier3590 viewsSingle-Ended monoblock amplifier using ECL86 / 6GW8 tube.
5687-Tube-CD-Linestage.jpg
5687-Tube-CD-Linestage.jpg5687 Tube Linestage3582 viewsHere I am using a diy 5687 tube preamp as a line stage for a Sony CD player.
4-channel-400W-amplifier.jpg
4-channel-400W-amplifier.jpg 4 channel, 400 W amplifier3574 viewsThis 4-channel 400 W amplifier uses Hypex UcD400HG modules together with the corresponding power supply.
The whole is mounted inside a Galaxy 330 x 230 x 80 case.
For building instructions, have a look at this project's wiki.
Two such amplifiers has been working for over 2 years in my lounge, driving Linn Komponent 110 loudspeakers which each have 4 speaker inputs.

Francois Corthay - Switzerland

Project Page: 4 channel 400 W amplifier using Hypex UcD400HG modules
EF86-EL84-Parafeed-Tube-Amplifier.jpg
EF86-EL84-Parafeed-Tube-Amplifier.jpgEF86 / EL84 Parafeed Tube Amplifier3564 viewsEF86 driver and EL84 output Parafeed Tube Amplifier. Uses a 230V primary, 9V secondary Talema 30VA mains toroidal transformer as the audio output transformer (OPT). For more details and a schematic, see the EF86 / EL84 Parafeed amp thread.
DIY-Two-Way-Speaker-VoXDeuX.jpg
DIY-Two-Way-Speaker-VoXDeuX.jpg3558 viewsUsing inexpensive components from the local electronics shop I constructed these small bookshelf two-way speakers. They comprise a 5” paper cone mid-woofer and dampened silk done tweeter. On the sides and back is wide internal vertical bracing and bitumanised heavy aluminum foil. This forms bass chambers within the box to control rear reflection. The passive crossover sits external to the speakers and is a Linkwitz-Riley 2nd order with a crossover point set at 3 kHz. The boxes and crossovers are bi-wired using Cat5 cable from the amp to driver. They sound excellent for an AU$350 build.

For more info, see the Simple and Cheap Two Way Speakers thread in the forum.

Mark Houston – retro-thermionic
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IMG_1419.JPGDissipator3555 viewsThe dissipater is homemade.
Note the shape and size of the inter-connecting metal between sheets... i don know if the shape was necessary but... it was a aesthetic choice.
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6E5P_SE_6n1p_driver-_maze_OPTS.jpg6E5P SE, 6n1p driver, MAZE OPT's in a scrappy chassis for testings3544 viewsThis is one of my latest audio tube DIY projects made in a scrappy chassis for breadboard use and measurements. I 'll transfer it to a nice wooden chassis now for sure.
The tube in output is the russian HF tetrode 6E5P, with max anode dissipation 8.5 Watts. It's a hell of a driver together with a CCS or Choke loaded solution. The driver is a classic ground cathode with the 6n1p for both channels. The 6n1p cathodes are not cap bypassed so the gain in this operating point is ~ 8. This is what exactly needed to drive the 6E5P in full output without the use of a preamp. The PSU is a tube type one using the Sovtek 5AR4. All the PSU caps are MKP (Mcap by Mundorf 100μF/400v.
By the way there is no Electrolytic cap in this Frankie amp. The cathode bypass cap on the 6E5P stage (output) is also MKP by Solen 82μF/250V. The coupling cap from driver to 6E5P grids is RC type using the marvelous 0.22/1000V PIO K40Y Russian caps. The OPTS are a bit over sized with 5K primary impedance made by mazeboutique.com.
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IMG_1420.JPGDIY Heat Sink3538 viewsAfter polishing... beautiful, no?
DIY-EL84-Push-Pull-Tube-Amp.jpg
DIY-EL84-Push-Pull-Tube-Amp.jpgDIY EL84 / 6BQ5 Push Pull Tube Amp3521 viewsThe first "OddWatt" project. This is an DIY EL84 / 6BQ5 Push-Pull Tube Amplifier. The input stage is a SRPP using ECC802S tubes, while the output stage is ultra linear. LM317 Regulators are used as constant current sources (CCS) for the output stages. DC is used for the tube heaters.
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00139.jpgFinished, front view3516 viewsNow you know why it is named Blackbox, right?
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SV101672.JPGBurr-Brown OpAmp Preamp II3508 viewsThis is the second of my preamps based on the high performance Burr-Brown OPA2134PA. This one has been custom built for a fellow in the US. This build has additional and switchable inputs-as you can see. The bottom and center row of inputs are selectable by the switch, the top row of connections is the output. See the DIY OP Amp Based Preamplifier page for more details.
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IMG_3498.jpgFinal active crossover + gainclone setup3503 viewsBurning the 4-channel DIY Gainclone and active crossover. I think this is the greatest sound quality improvement, especially for $50 active crossover. There is still hum from the new pair which I need to troubleshoot.
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6N1P-5881-SE-UL-Tube-Amp.jpgSingle-Ended 5881 Tube Amp with 6N1P driver3491 viewsSingle-Ended (SE) 5881 Tube Amp operating in Ultra-Linear (UL) mode with a 6N1P driver. The amplifier is based on this KT88 SE UL Tube Amp. I constructed my own and used a couple of 5881 tubes which I got for free. I did use the 6N1P though. I over specked the power tranni which originally produce over 600V with no load and diode rectification. I eventually used the secondary centre tap, limiting resistors and a standby switch and brought B+ to 405V. The base is made of Asian Merbeau and the top plate epoxy enamel paint. Edcor XSE15-8-5K OPTs, and ceramic sockets add to the overall quality finish. The sound is clean and airy and the amp is dead quiet between tracks. It will play quite loud with efficient speakers and has no audible distortion. The sound stage fills the room and stereo image is very accurate.
DIY-50EH5-SE-Tube-Amp.jpg
DIY-50EH5-SE-Tube-Amp.jpgSingle Ended 50EH5 Tube Amplifier3490 viewsA DIY SE Tube amp from Japan using 50EH5 vacuum tubes. Similar in design to this DIY 50EH5 Single Ended Tube Amplifier project.

diyAudioProjects.com Comments: While we have seen similar projects built without the use of an isolation transformer, we always recommend that one is used for safety reasons.
LePacific-MC-PrePre.jpg
LePacific-MC-PrePre.jpgLe Pacific MC pre preamp3488 viewsHere is one of three Le Pacific MC pre preamp builds. All the construction is on veroboard (strip board). These builds have been tested with a two different cartridges with an output of 0.35mV and all work extremely well. The J-FETs are 2SK170 BL which are matched. The output capacitors are Russian mililtary PIO. The case colour is Sungold the same used on Paris. All phono preamp builds are battery powered.

Mark - retro-thermionic
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DIY-12AU7-Cathode-Follower-Preamp.JPGDIY 12AU7 Cathode Follower Tube Preamp3482 viewsA Foreplay inspired 12AU7 vacuum tube preamplifier. This is an all tube build, rectified with a 6X5GT, and regulated using an 0D3.

More details about my DIY 12AU7 Tube preamp.
614 files on 31 page(s) 21


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