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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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5687-Tube-CD-Linestage.jpg
5687-Tube-CD-Linestage.jpg5687 Tube Linestage3523 viewsHere I am using a diy 5687 tube preamp as a line stage for a Sony CD player.
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MerlotJJSGallery.jpgretro-thermionic Merlot Amp with JJ KT88 Blue Glass3506 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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IMG_1419.JPGDissipator3504 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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ECL86_SE.JPGECL86 Single-Ended Amplifier3498 viewsSingle-Ended monoblock amplifier using ECL86 / 6GW8 tube.
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EF86-EL84-Parafeed-Tube-Amplifier.jpgEF86 / EL84 Parafeed Tube Amplifier3488 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.
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IMG_1420.JPGDIY Heat Sink3480 viewsAfter polishing... beautiful, no?
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12inch-60L-DIY-Subwoofer.jpg12-inch 60L Subwoofer3469 viewsThese 60ltr sub-woofers were built to complement my 2-way speakers "VoXDeuX". The drivers are 12" polycones with a free air resonance of 25 Hz. In the box they go down to 31 Hz where they are very active. The drivers are very efficient and are being powered by a compact 50W Class-D amplifier. A stereo feed is taken from the preamp and passed through an electronic filter. The filter has a -3 dB point of 52 Hz and but employs only a -12 dB slope. The internals of the box comprise of six vertical braces. Bitumanised heavy Aluminum foil covers most surfaces. Pockets and chambers are formed at the rear by the bracing which carries additional dampening. These are then covered by a single layer of damping.

Mark Houston – retro-thermionic
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00139.jpgFinished, front view3465 viewsNow you know why it is named Blackbox, right?
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6E5P_SE_6n1p_driver-_maze_OPTS.jpg6E5P SE, 6n1p driver, MAZE OPT's in a scrappy chassis for testings3459 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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DIY-EL84-Push-Pull-Tube-Amp.jpgDIY EL84 / 6BQ5 Push Pull Tube Amp3456 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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SV101672.JPGBurr-Brown OpAmp Preamp II3450 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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DIY-SE-Class-A-Mosfet-Amp.jpgClass-A 2SK1058 Renesas Mosfet Single-Ended Amp in Heatsink Enclosure3443 viewsThis is a build of Mark Houston's DIY Class-A 2SK1058 MOSFET Amplifier which was built without circuit board in order to have the shortest connections as possible and to meet the tradition of valve amps. The heatsinks of the fanless enclosure are heating up to little more than 40° C

Stefan - Germany
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IMG_3498.jpgFinal active crossover + gainclone setup3436 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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DIY-50EH5-SE-Tube-Amp.jpgSingle Ended 50EH5 Tube Amplifier3430 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.
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DIY-12AU7-Cathode-Follower-Preamp.JPGDIY 12AU7 Cathode Follower Tube Preamp3425 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.
6T9-SE-Tube-Amp-Kit.jpg
6T9-SE-Tube-Amp-Kit.jpg6T9 Tube Amp with Edcor Output Transformers3412 viewsThe addition of the Edcor OPTs (XSE15-8-5K) has allowed this little amp to perform to its full potential. -3dB points are 30Hz and 20kHz and though the 1kHz square wave is a little wobbly, the amp plays well with good bass and lots of treble. See the 6T9 Tube Amp Project page for full details.

Also, here is a Ultra-Linear 6T9 Tube Amplifier that I built.
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6N1P-5881-SE-UL-Tube-Amp.jpgSingle-Ended 5881 Tube Amp with 6N1P driver3405 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.
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6P15-EL84-SV83-Tube-Amp.jpgEL84 / SV83 / 6P15 Single-Ended (SE) Tube Amp3402 viewsSingle-Ended Tube Amp using 6P15 output tubes (similar to the EL84 or SV83). 5963 signal tube and 5Y3 rectifier tube. The output transformers are inside the chassis.
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6T9-Vacuum-Tube-Amplifier-Kit.jpg6T9 Tube Amplifier in Ultra Linear Mode3390 viewsMy second 6T9 vacuum tube amp with Edcor transformers. This time the screen grid resistor was cut away and the UL tap was used. I believe it sounds better using the UL tap. Detail in voice appears to be much richer and the sound stage more detailed than with the previous amp. The tubes once more are NOS GE and are the taller variety. For full details, see the Ultra-Linear 6T9 DIY Tube Amplifier page. Also, here is my first DIY 6T9 Vacuum Tube Amplifier Project.
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IMG_1423.JPGMaking the chassis3374 viewsBefore bending the sheet metal.
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