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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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RH84_-_SE_EL84_Tube_Amp.jpg
RH84_-_SE_EL84_Tube_Amp.jpgRH84 - SE EL84 Tube Amplifier2877 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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apic8A.jpgTwo Buck Chuck - 50EH5 Tube Amp2875 viewsThis is a stereo tube amp that was pulled out of a Philco record player that I paid two dollars for. It uses 50EH5 tubes in single ended mode.

Similar project: Single-Ended (SE) 50EH5 Tube Amplifier
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IMG_2554.JPG50EH5/25EH5 Filament Reg. Power Supply2870 viewsThis is the inside of the regulated power supply for the 50EH5 / 25EH5 tube filaments. It uses an LM317 voltage regulator and an old VCR power transformer that had just the right voltage and current ratings for the filaments of the 50EH5 / 25EH5 tubes. The output from the regulator is set for 20 some volts for the 25EH5's, and the unregulated DC is about 45V for the 50EH5's.
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DIY-KT77-Push-Pull-Tube-Amp.jpgDIY KT77 Push Pull Tube Amplifier2850 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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BBAmpS.jpgBBAmp (BeBamp) bread board tube amp with no driver stage.2842 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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12AX7-Tube-Preamp-Kti-Enclosure.jpg12AX7 Tube Preamplifier Kit2838 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.
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DIY-12AU7-Tube-Preamplifier.jpgMini 12AU7 Vacuum Tube Preamplifer2836 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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Atwood3.JPG12AX7 Valve Preamp with Jupiter Beeswax Caps2832 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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F2.jpgTube amplifier for guitar and music listening2823 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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SE_807_Tube_Amplifier.jpgSE 807 Tube Amplifier2821 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
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DIY-ECC802S-12AU7-ECC82-Vacuum-Tube-SRPP-Preamplifier.jpgDIY ECC802S Tube SRPP Preamplifier2820 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.
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50EH5-Single-Ended-Tube-Amp.jpgSingle-Ended 50EH5 Tube Amp2819 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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SE-6AS5-Pentode-Amp_.jpg6AS5 Micro-Power 1W/channel UL Amp2812 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
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WFR-20_1.jpgSangean internet table radio2805 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.
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Jan6814HPAmpIIFinisSmall.jpgJAN6418 portable Triode Headphone Amp MkII2798 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 Amplifier2798 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.
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parallel-6C33C-tube-power-amplifier.jpgDon's parallel 6C33C tube power amplifier2786 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
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JAN6418HPD_GalleryII.jpgRaytheon JAN6418 sub-mini valve headphone amp 2770 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.
SE-807-Tube-Amp.jpg
SE-807-Tube-Amp.jpgSingle-Ended (SE) 807 Tube Amplifier2768 viewsAfter picking up a couple of cheap ($7) ATS25/807 tubes a volunteer from the forum, Matt, designed me an amp to go with them. This project stagnated for over a year and a half and now is finally finished. The colours are strong between the Edcor 25W OPTs and power tranni and the “Red Delicious” top plates. The bases are Australian Spotted Gum. Remote PS carries a 5H 300mA Hammond choke and 5Y3 power tube (upgraded to Golden Dragon 5U4). The amp section has all ceramic sockets and plate cap, the driver tube a Sovtek 6SN7 (has been upgraded to Shuguang 50 Year Treasure). Bipolar bypass caps are used on the 6SN7 and low ESR caps on the 807s. The amp looks smart and sounds excellent. It plays loud for its 2.7 measured Watts and has huge dynamic head room.

Mark - retro-thermionic
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amputron-12au7-IRF510-headphone-amplifier.jpgAmputron: 12AU7 / IRF510 Headphone Amp2760 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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