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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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71-A-Tube-Amplifier-SE.jpg
71-A-Tube-Amplifier-SE.jpgUX-171A Tube Amplifier2757 viewsThis amplifier uses the UX-171-A tube (matched pairs) which are rare and produce only 1/2 W of output power. There are no resistors or capacitors in the audio circuit. A Hammond 124B nickel core inter-stage transformer couples to the power tube. Edcor 10W OPTs in the metal case. Bias is provided by 3 x 9V batteries and 230V by two step-down transformers wired in reverse. The rectifier tube is a very old "80". Power supply filtering is under the top plate (ply timber). The base houses the power transformers and is a 1940s wooden pot stand. The tube amplifier sounds excellent.

For more info, see the 171-A single-ended amplifier thread in the forum.

Mark Houston – retro-thermionic
TeaBoxRearSmall.jpg
TeaBoxRearSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote PS2756 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.
Push-Pull_6L6_Tube_Amplifier.jpg
Push-Pull_6L6_Tube_Amplifier.jpgPush-Pull 6L6 Tube Amplifier2746 viewsMy DIY 6L6 tube amplifier. The output tubes are 6L6 which are driven by a pair or 12AX7. The indicator tube is an EM80. See the other photos.

Panagiotis Gavriil (Greece)

See the DIY Audio Schematics page for more 6L6 circuits.
Oatley-Electronics-K272B-prototype.jpg
Oatley-Electronics-K272B-prototype.jpgOatley Electronics K272B prototype2736 viewsSoon to be released Oatley Electronics K272B prototype. I recently made two CMoy style, OPA2134 based, HP amps but now prefer the better sounding, harmonically rich, K272B build. Two 9V batteries are used in parallel to prolong battery life and switching phone jacks, power switch and “on” LED ensures it is difficult to accidentally leave the amp on. The enclosure is impact resistant ABS which is heavy Al foil lined. Volume control is via your player and the “6418-B” will drive low impedance phones. Where the CMoy style, chip based, HP amps are clean, clear, bright and clinical, the “6418-B” has a much richer, more harmonically complex sound and a smoother all over delivery. Really it all gets down to taste. I would recommend building the K272B when released around early February 2013. I suggest you upgrade the Oatley passive parts and chip socket to better quality parts.

For more info, see the
Oatley K272B JAN6418 headphone amp and preamp thread in the forum.

Mark Houston – retro-thermionic

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JAN6418HPD_Gallery.jpgRaytheon JAN6418 sub-mini valve portable headphone amp2734 viewsJust when you thought you had seen it all something "different"comes along. This 9V valve front-end headphone amp/driver is based on a Oatley Electronics (Australian) kit. I built the kit stock standard and loved the sound. Then upgraded most parts to make a "Signature" strength preamp version. A L4949 5V regulator chip and PT2308 headphone driver come with the kit which also has two Raytheon JAN6418 sub-mini valves. As a preamp (replace the PT2308 with an OPA2134) or headphone amp the kit is excellent. I run both on two 9V lithium batteries in parallel.The amp only draws 12mA! Soundstage is excellent and bass rich and extended. The bandwidth is <10hz to 50Khz (-3db points).

See the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit project page for full details.
5751-SRPP-Push-Pull-EL84-Tube-Amp.jpg
5751-SRPP-Push-Pull-EL84-Tube-Amp.jpg5751 SRPP / Push-Pull EL84 Tube Amplifier2731 viewsThree months ago, I finished the PoddWatt 5751 SRPP / Push-Pull EL84 tube amp. This is a great amplifier with great sound. Now it is connected in UL mode without any NFB. I would like to try the amp in a Triode connection mode, but I do, there is too much power loss so I am investigating a the possibility of a parallel push-pull output stage.

This enclosure is made using the material Corian which is a product by DuPont often used for counter-tops.

Dean

For full details of this tube amplifier circuit, see the PoddWatt 5751 SRPP / EL84 (6BQ5) Push-Pull Tube Amp Project page.
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Audio-Note-Jinro-Integrated-211-Tube-Amplifier.jpgAudio Note Jinro Integrated Tube Amp (SE 211)2717 viewsAudio Note Jinro Integrated Tube Amplifier on display at the 2011 Salon Son & Image show in Montreal.

Tubes: 2 x 5R4WGB, 2 x 211, 1 x ECC82 (or 5814a), 1 x 7044 (or 5687).

Power: 18Wpc into 8ohm @ 5% THD.
Weight: 85lbs
Cost: $26,500
JJ-Tesla-Blue-Glass-KT88-Vacuum-Tubes.jpg
JJ-Tesla-Blue-Glass-KT88-Vacuum-Tubes.jpgJJ / Tesla Blue Glass KT88 Tubes2710 viewsA set of Blue glass envelope JJ / Tesla KT88 vacuum tubes used in the Odd Blocks - KT88 Push-Pull Class A DIY Tube Amplifier
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Digital_Pictures_1_033.jpgKT77 OddBlock close-up2710 viewsOddblock KT77 close-up view. Instructions for this tube amp project can be found on Bruce's KT77 Push-Pull Tube Amp page.
DSCN0290_Small.jpg
DSCN0290_Small.jpgAnother version PP UL Oddblock 6P3S & ECC83 Tungsram2704 viewsAnother version PP UL Oddblock. This one uses 6P3S & ECC83 Tungsram tubes.

See the OddWatt KT88 tube amplifier project page for information about the circuit.
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BoydOutSideSmall.jpgJAN6418 sub-mini tube preamp kit MKII2698 viewsThe MKII finished Oatley kit complete with 4oz brass knob. See other image for an internal photograph. The preamp has an excellent sound with good bass extension. This build was requested by an Australian women who saw the preamp article on the diyAudioProjects.com site. For more information about these little battery powered tube amplifier kits, see the JAN6418 tube preamp / headphone amp kit.
Genalex-Gold-Lion-KT88-Vacuum-Tubes.jpg
Genalex-Gold-Lion-KT88-Vacuum-Tubes.jpgGenalex Gold Lion KT88 Vacuum Tubes2695 viewsClose up view of the Genalex Gold Lion KT88 Vacuum Tubes. The amplifier topology is Push-Pull and built following Bruce's KT88 Push-Pull Class A DIY Tube Amp with 12SL7 Driver build. The extra tube is a 6NO30 which delays the B+ so the tubes have time to warm up.
KT120_IIs.jpg
KT120_IIs.jpgBe Bamp with KT120 Tung-Sol tubes2690 viewsA fellow builder had bought a pair of these tubes and claimed they were an improvement over KT88s and others. I had to try for myself. Just dropping in the tubes in where the JJ Blues Glass KT88s once were gave me a 2W improvement in my SE UL bread board amp raising the power to 9.7W. Bass is far more controlled and mid-range crisper and clearer. Idle current is 112mA up from 93mA and HT+ is 400V with bias at 34V. Operation is class A. These tubes are not only impressive looking but have improved the performance of the amp. +/- 3db points are 26hz to 36khz.
Don_SE_300B_Tube_Amp.jpg
Don_SE_300B_Tube_Amp.jpgDon's single-ended 300B amplifier2684 viewsThis is Don’s (a friend) 300B. It uses EH 300Bs plus a dual driver stage 6SN7. The top plate is 4mm ABS plastic. The timber base Don makes himself and are extremely elegant. Absolute first class craftsmanship. The transformers are wound locally by Dyne. Don has no formal training in electronics and doesn’t understand how the circuits work but he has no problems following a schematic. Don has also built a 6C33C SE and EL34 SE and a few others. This 300B has a big solid sound.

Mark - retro-thermionic
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DSCN0450S.jpg6S4S & 6J9P SE tube amplifier project2677 viewsMy new single-ended class-A amplifier using 6S4S and 6J9P tubes.
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DSCN0084s.jpgSE RCA 2A3 Triode Tube Amp2671 viewsMy favorite class-A single-ended (SE) tube amplifier an RCA 2A3 triode driven by a Phillips E180F pentode. The audio output transformers are Hammond 125 FSE.

The power is external in the black box on the right side. 2x4 w and consists of Black Gate and Rubycon capacitors. Resistors carbon
film and Mills. Autobias. Interstage transformers
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IMG_2142.JPGGlowing 12X4 Tube2669 viewsThis is a glowing 12X4 / 6X4 tube in a full wave bridge rectifier power supply. I've only seen a couple of people use a diode and tube type bridge rectifier, but I personally like this setup. This type of bridge rectifier is used in my 50EH5 amp but using a 6AX5. This is a project I have not finished yet.
Philips_EL6431_Amplifier.jpg
Philips_EL6431_Amplifier.jpgPhilips EL6431 Amplifier2663 viewsClose up photo a vintage Philips vacuum tube amplifier which I rebuilt. The Philips EL6431 uses four EL34/6CA7 tubes to obtain an output power of around 120 watts into an 8 ohm speaker.

For more information and photographs about my Philips EL6431 amplifier rebuild see the 120 watt Philips EL6431 Tube Amp forum thread.

Alan (Canada)
SAR-Labs-STA80-KT88-PP-Tube-Amp.jpg
SAR-Labs-STA80-KT88-PP-Tube-Amp.jpgSAR Labs STA80 KT88 Tube Amp2658 viewsShot of a Scientific Audio Research Labs (SAR Labs) STA80 tube amplifier over at Fred's place (April 2010). The tube compliment was 12AT7, 12BH7 (I think) and JJ KT88 Blue Glass tubes. About 55-65W and very nice sound.
6V6-Lacewood-Amplifier.jpg
6V6-Lacewood-Amplifier.jpg6V6 Lacewood Amp2649 viewsThis is a 6V6 SE UL design with a 6SN7 driver stage (unbypassed cathode). Peak undistorted power is 3.2W RMS into 8Ω. Input sensitivity is 1.56v peak (1.1v rms) for full power. Designed for very quiet background, the power supply sports 15H of total inductance in two stages and a noise level of -128dBv. Hammond iron in the power supply section and Edcor output transformers.

Matt Renaud, Pacific Northwest, USA

For full details of this 6V6 tube amp, see the project page, 6V6 Lacewood Amp. Please feel free to ask questions or post comments in the 6V6-6SN7 Humless "Lacewood" Amp thread.

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