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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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DIY-KT77-Push-Pull-Tube-Amp.jpg
DIY-KT77-Push-Pull-Tube-Amp.jpgDIY KT77 Push Pull Tube Amplifier2824 viewsThe second "OddWatt" tube amp project. This one is the Oddwatt 225 which will work with a number of octal tubes. Again, the driver stage is an SRPP using 6SL7 tubes and the output stage is a Class A UL SIPP using KT77 vacuum tubes.LM317 Regulators are used to provide the cathode CCS.

For more information, see the 6SL7 SRPP / KT77 SIPP (Push-Pull) DIY Tube Amplifier project page.
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Single-Ended-300B-Tube-Amp-MockupIIs.jpgSingle-Ended 300B Tube Amplifier - Mockup IIs2821 viewsThis is my first 300B tube amplifier. The power supply will be separate from the amp. The tubes are $1200 rrp TJ Full Music 300B/SE carbon plates. The 6SN7 is a 50 year Treasure. The audio output transformers are 30W Hammonds. The base is Mirbeau and the top and bottom plates are 2mm thick aluminum. Signal wiring is 0.7mm pure silver wire and super heavy gold plated speaker binding posts.

For the design information see the 300B SET Design Project thread on the forum.

Mark Houston (Australia) - retro-thermionic
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TDA7294-chipamp-6N3-tube-input.jpgTDA7294 Chip Amplifer with 6N3 Tube input2818 viewsFrom a $48 printed circuit board and a bag of parts (eBay) I fashioned this very functional looking 80W amplifier. The parts include a 6N3 valve (preamp stage), two TDA7294 high performance power chips and all the parts required to populate the circuit board. You have to source the chassis, heatsinks and connectors yourself and that's where the expense starts.

The amplifier has been constructed in attractive charcoal black 2U 19" rack enclosure. Three sets of switchable RCAs on the back and 4 oz volume knob and Alps pot to control loudness. Speaker protection is included on the PCB and there is a delay (anti-thump) complete with flashing LED before the amp is ready for use. Very clean sound, holographic presentation.

For more details and impressions see the Chips and Tube - 6N3 and TDA7294 integrated amp thread.

Mark Houston – retro-thermionic
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RH84_-_SE_EL84_Tube_Amp.jpgRH84 - SE EL84 Tube Amplifier2813 viewsThe first tube amp I built and I love the sound... pentode power with triode sound! The amplifier topology is the RH84 from designer Alex Kitic. I am using JJ EL84 and Sylvania 12AT7 tubes. The most important aspect of this ingenious design is the plate to plate partial feedback without global feedback, 2nd harmonic distortion is slightly increased giving the impression of listening to a SET amp. Damping factor and bandwidth are also improved. The OPT are from a salvaged an RCA console - a gift from Dave of Planet10 (thanks).

What a great amp !

Isophon, Canada
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DIY-12AU7-Tube-Preamplifier.jpgMini 12AU7 Vacuum Tube Preamplifer2805 viewsThis is a simple 12AU7 tube preamp built using a couple of Hammond cases and a few reused parts.
By: Alan M.
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BBAmpS.jpgBBAmp (BeBamp) bread board tube amp with no driver stage.2803 viewsI wanted to see if I could drive a SE UL tube power stage from a two stage tube preamp. This bread board amp (BBAmp - BeBamp) was constructed to test the theory. Most bread board amps have the wiring exposed. I wanted this to look and sound excellent so all wiring is underneath the bread board. There are lots of exposed components e.g. rectifier components, but all wiring is hidden. The bread board is Australian pine, sanded and treated with Australian beeswax. Edcor OPTs are enclosed in the aluminum case (back right) which provides a back plate for speaker posts and input RCAs. The amp is absolutely dead quiet and extremely transparent. The amp will produce the sonic signature of your preamp. A high gain preamp and very sensitive speakers are required. This can be shipped as a modular bread board kit amp. The tubes are JJ Blue Glass KT88.
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Atwood3.JPG12AX7 Valve Preamp with Jupiter Beeswax Caps2801 viewsI have made a number of these kit two stage 12AX7 valve preamps in all sorts of enclosures. I have employed a wide variety of different caps in the signal path including, Sprague orange drops, Cardas Golden Ratio and standard metalized polypropylene. In this build I have used the Jupiter beeswax and paper caps. I have used these caps before in SS preamps and found the sound very natural and liquid. The larger components have been placed on the underside of the cct. brds.to allow the valve to project through the enclosure.
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12AX7-Tube-Preamp-Kti-Enclosure.jpg12AX7 Tube Preamplifier Kit2801 viewsA finished photos of the 12AX7 Tube Preamplifier Kit. The volume control is an Alps pot salvaged from an old Sony amp. I added a second input and switch to allow multiple inputs. There is also a second out for a subwoofer.

The preamp is dead quiet and the sound is far more than I had hoped for. My spouse was skeptical, shall we say. But when she heard familiar music she was hearing things never heard before and the bass was thicker and richer. I heard a much bigger sound stage, sparkling highs. Very impressive. Thanks to Bruce Heran for all his help with this project.
50EH5-Single-Ended-Tube-Amp.jpg
50EH5-Single-Ended-Tube-Amp.jpgSingle-Ended 50EH5 Tube Amp2784 viewsThis is a simple 50EH5 Single Ended Tube Amp that I built a few years back. Full details are available on the 50EH5 Single-Ended (SE) DIY Tube Amplifier Project pages.
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F2.jpgTube amplifier for guitar and music listening2782 viewsDIY tube amp for guitar and music. 12AT7 input tube and singled ended EL34 output tube. Power output is about 10 Watts.

For more details about this tube amplifier see: http://sites.google.com/site/diyrbt6/ (Portuguese)
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WFR-20_1.jpgSangean internet table radio2776 viewsReally neat & nice sounding internet table radio. Works with a direct LAN connection or wifi. You have access to over 6000 internet stations sorted in a Genre or by Country list. Has a line out so you can hook it up to your stereo, or play songs stored on your PC.
DIY-ECC802S-12AU7-ECC82-Vacuum-Tube-SRPP-Preamplifier.jpg
DIY-ECC802S-12AU7-ECC82-Vacuum-Tube-SRPP-Preamplifier.jpgDIY ECC802S Tube SRPP Preamplifier2770 viewsThis fantastic looking piece is a ForeWatt ECC802S tube SRPP preamplifier by Bruce. The gain of the preamp can be set at 7 or 11. 12AU7 and ECC82 tubes can also be used. The power supply is solid state.

For full details see the ForeWatt DIY ECC802S (12AU7 / ECC82) Vacuum Tube SRPP Preamp project page.
SE_807_Tube_Amplifier.jpg
SE_807_Tube_Amplifier.jpgSE 807 Tube Amplifier2763 viewsI send to you a picture of my 807 "Oldschool" tube amp. It's Homebrew Audio made in Germany.

In the first stage I used a EBC91 (6AV6), followed by an Russian 6H8C (6SN7) that works in SRPP configuration. Next is the 807 tube in SE. A special gimmick is the EM83 magic eye with to sections, one for each channel.

Description is published on my site www.audioelektronik-shop.de
Jan6814HPAmpIIFinisSmall.jpg
Jan6814HPAmpIIFinisSmall.jpgJAN6418 portable Triode Headphone Amp MkII2759 viewsThe finished (second) headphone amp is assembled in a slim durable plastic enclosure lined top and bottom with bituminized heavy Al foil. You can see the lithium battery, printed cct. brd. and 6.5mm stereo phono sockets. In this build the stereo phono sockets have double pole double throw switches which are all employed, including the “real” switch. The switches make only when both devices are plugged into the amp. The idea is if you do not have devices plugged into both input and output and have the switch on then the unit is “off” with no battery drain. The battery is lithium so expensive bit I should get 80 to 100 hours of play out of this little portable triode headphone amp. See the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit project page for full details.
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Digital_Pictures_1_002~0.jpgBottom View - OddWatt KT77 Push-Pull Valve Amplifier2756 viewsBottom view of my build of the Oddblocks amps from rparsh. I decided to incorporate a switch on the CCS so I can also use this amp with my JJ KT88s too.
This build follows the OddWatt KT77 Push-Pull Tube Amplifier instructions by Bruce but I built mine as mono-blocks.
SE-6AS5-Pentode-Amp_.jpg
SE-6AS5-Pentode-Amp_.jpg6AS5 Micro-Power 1W/channel UL Amp2742 viewsA nice class-A stereo amp based on the 6AS5 pentode. The amp uses a 6CG7 driver tube to drive the output stages in UL mode. The chassis is black walnut with a strip of lacewood inlay for contrast. Power level is only 1 watt per channel calling for high sensitivity loudspeakers. The input sensitivity for full output is a little over 1v peak so this amp can be driven by just about any MP3 or CD player or even a simple line level input.

Matt Renaud
Pacific Northwest, USA

Project Thread: Micro-power UL - The Amp that Never Ends
JAN6418HPD_GalleryII.jpg
JAN6418HPD_GalleryII.jpgRaytheon JAN6418 sub-mini valve headphone amp 2734 viewsThis shot shows the Oatley Electronics Kit in a small case to be constructed as a headphone amp/driver. The small cct. brd. is double sided, plated through, solder masked and screen printed. Construction is simple and this $AU27 kit makes an excellent first valve kit of any DIYer. See the other image for the completed headphone amp. The L4949 5V reg. chip lights the led for the first second it is on then only re-lights when the battery voltage falls below 6.8V. Nice touch. The reg chip supplies 5V to the filaments which are in series with a 270omh resister. The amp only draws 12mA. Two 9V lithium batteries power the unit. In the preamp version the PT2308 headphone driver chip was replaced with a Burr-Brown OPA2134. Excellent sound stage and rich bass. And it is a portable headphone amp!

There is more information available on the JAN6418 Valve (Tube) Headphone Amplifier Kit page.
parallel-6C33C-tube-power-amplifier.jpg
parallel-6C33C-tube-power-amplifier.jpgDon's parallel 6C33C tube power amplifier2726 viewsDon the amp builder (who’s 300B amp is posted in the gallery) has put together this parallel 6C33C power amp. Though not complete it’s not hard to see this is going to be a great looking amp. With the twin power tubes the primary impedance of the OPTs can be lowered to produce greater output power. The toroidal transformer is for the heaters which draw a huge amount of current. The top plate is ABS and Don made the base and is now making bases for me. All other trannies are Dyne who a local winders (Victoria Australia). Can’t wait to hear this one. Don also has a 2A3 almost finished.

Mark Houston
TeaBoxRearSmall.jpg
TeaBoxRearSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote PS2725 viewsIn this image you can see the RCA connections and power connections for the remote PS. An XLR plug and socket provide a solid connection for the power cord. Two sets of switchable inputs allows two devices to be selected. A three wire power cord provides 250VDC HT, 6VDC and common earth to the preamp.
amputron-12au7-IRF510-headphone-amplifier.jpg
amputron-12au7-IRF510-headphone-amplifier.jpgAmputron: 12AU7 / IRF510 Headphone Amp2717 viewsDave and his wife's build of the NP-100v12: 12AU7 Tube / IRF510 MOSFET Hybrid Headphone Amplifier project.

See Dave's website for more photos of their fantastic versions of the headphone amplifier:
http://robotninjapirate.com/v/Amputron/
http://robotninjapirate.com/v/Amputron/Board+Assembly/

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