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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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00139.jpgFinished, front view3306 viewsNow you know why it is named Blackbox, right?
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EF86-EL84-Parafeed-Tube-Amplifier.jpgEF86 / EL84 Parafeed Tube Amplifier3294 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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K281FrontS.jpgOatley Electronics sub-mini tube/chip amp hybrid K2813285 viewsAn image of the front panel of the Oatley Electronics of Australia tube and chip hybrid power amp. You can see the UV leds which indicate when the amp modules are powered. The amp comprises two K281 kits and is dual mono construction.

After extensive listening I am convinced this is a very good combination of tubes and chip in one integrated power amp. Sound stage in deep with each performer or instrument have their own space on that stage. Holographic.
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SV101672.JPGBurr-Brown OpAmp Preamp II3277 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-EL84-Push-Pull-Tube-Amp.jpgDIY EL84 / 6BQ5 Push Pull Tube Amp3272 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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IMG_3498.jpgFinal active crossover + gainclone setup3267 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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6E5P_SE_6n1p_driver-_maze_OPTS.jpg6E5P SE, 6n1p driver, MAZE OPT's in a scrappy chassis for testings3264 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-50EH5-SE-Tube-Amp.jpgSingle Ended 50EH5 Tube Amplifier3259 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 Preamp3255 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.
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ECL86_SE.JPGECL86 Single-Ended Amplifier3233 viewsSingle-Ended monoblock amplifier using ECL86 / 6GW8 tube.
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MerlotJJSGallery.jpgretro-thermionic Merlot Amp with JJ KT88 Blue Glass3231 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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6T9-SE-Tube-Amp-Kit.jpg6T9 Tube Amp with Edcor Output Transformers3228 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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6P15-EL84-SV83-Tube-Amp.jpgEL84 / SV83 / 6P15 Single-Ended (SE) Tube Amp3212 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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IMG_1423.JPGMaking the chassis3211 viewsBefore bending the sheet metal.
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SV101673.JPGOPA2134 Preamp II with selectable inputs3204 viewsOP amp based preamp, that provides two pairs of selectable inputs, volume and balance control and 6dB of gain. A compact cct. with the only links on the cct. brd. being silver earth links, packs a lot of performance into a solid cast aluminum case. With distortion figures as low as .00008%, solid pure silver wire throughout, WBT silver solder and each of the the two circuit boards having their own virtual +/- power supply plus additional tar and aluminum damping/shielding internally this preamp can deliver. I hope the new owner enjoys listen through it as much as I have enjoyed building it. See the DIY OPA2134 Preamplifier page for more build details.
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6T9-Vacuum-Tube-Amplifier-Kit.jpg6T9 Tube Amplifier in Ultra Linear Mode3203 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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6N1P-5881-SE-UL-Tube-Amp.jpgSingle-Ended 5881 Tube Amp with 6N1P driver3190 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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IMG_1412.JPGAluminium and mate3163 viewsThe aluminum sheets used for the dissipater and a "Mate".
"Mate" is the Argentinian equivalent of "Tea" for a British.
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Jordan-JX92S-Speakers.jpgJordan JX92S Fullrange Speaker Drivers3147 viewsA pair of Jordan JX92S Fullrange Speaker Drivers.
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IMG_2675.JPG50EH5 / 25EH5 Tube Amplifier Internals3124 viewsFinally, the internals of the 50EH5 tube amp. I think I went a bit extreme on the fancy parts as I used 100uF Black Gate's and 62 ohm Riken's on the cathode bias of the tubes. As for the preamp I used more Riken's and a couple of 0.1 Mundorf plate caps. I also used a 12AT7 rather than the 12AX7, although they are interchangeable to what ever you decide. I then re-used a 500K pot as the volume control instead of the 100K (because that is what I had) and added a switch between preamp and line in.
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