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Decware-inspired-EL84-amp.jpgDecware inspired EL84 amp with attenuation3113 viewsThis is a Decware inspired EL84 power amp with attenuation. My twist was to make a it a EL84 SE UL (not triode). Also I upgraded the PS a little. One PS tweak was to use a Russian PIO 4uf cap as the first cap in the PS. Also the larger electros are all snubbed.
The inter-stage caps are Audio Note Tin foil, mylar and oil. The amp I called "Tamarisk" - just like how it sounds. The finished amp looks good and not too heavy. Sound is a big step up from my already great sounding 6V6 - Ozzie tube SE UL amp. On live classical every part of the music has a layer. There every instrument is heard in its own layer and decay, reveb etc also have their own layers.
Mark Houston – retro-thermionic
Forum Thread: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5385
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50EH5-Single-Ended-Tube-Amp.jpgSingle-Ended 50EH5 Tube Amp3101 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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DIY-KT77-Push-Pull-Tube-Amp.jpgDIY KT77 Push Pull Tube Amplifier3097 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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Push-Pull_6L6_Tube_Amplifier.jpgPush-Pull 6L6 Tube Amplifier3089 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.
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5751-SRPP-Push-Pull-EL84-Tube-Amp.jpg5751 SRPP / Push-Pull EL84 Tube Amplifier3083 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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6EM7-SE-Amp.jpgSE 6EM7 Power Amplifier3071 viewsYet another 6EM7 power amplifier. This time some parts were down graded and a different internal layout technique was used. The power transformer and choke are isolated top and bottom by rubber grommets. This ensures no AC vibration reaches the tubes. The initial power supply filtering is preceded with a on-board power filter, a 20uF/450V electrolytic capacitor and a 20H/100mA Hammond choke. The HT is supplied by a Hammond power transformer and Sovtek 5Y3 rectifier tube. The second stage of filtering is 47uF and 100uF electrolytic with a large limiting resistor ensure the amp is totally free from of hum and noise. All power supply capacitors are snubbed.
This amp sounds better than the last and I think it may be the Sylvania NOS 6EM7 tubes. Sprague orange drops are used in the inter-stage coupling and once more large non-polarized capacitors for the bypass on the power tubes. For the first time I have used Chinese made H&K 15W audio output transformers, can't fault them. The look of the amp is almost under-stated "sexy" and the sound the same - sexy and natural.
Mark Houston – retro-thermionic
UPDATE - June 2015 - see the 6EM7 Single-Ended Triode (SET) Vertical Amplifier project page for the latest revision of this amplifier.
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amputron-12au7-IRF510-headphone-amplifier.jpgAmputron: 12AU7 / IRF510 Headphone Amp3067 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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JAN6418HPD_GalleryII.jpgRaytheon JAN6418 sub-mini valve headphone amp 3061 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.
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WFR-20_1.jpgSangean internet table radio3050 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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6V6-Lacewood-Amplifier.jpg6V6 Lacewood Amp3044 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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TeaBoxRearSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote PS3043 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.
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DSCN0450S.jpg6S4S & 6J9P SE tube amplifier project3043 viewsMy new single-ended class-A amplifier using 6S4S and 6J9P tubes.
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JAN6418HPD_Gallery.jpgRaytheon JAN6418 sub-mini valve portable headphone amp3042 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.
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SAR-Labs-STA80-KT88-PP-Tube-Amp.jpgSAR Labs STA80 KT88 Tube Amp3039 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.
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Don_SE_300B_Tube_Amp.jpgDon's single-ended 300B amplifier3030 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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Juan-ZCA.jpgZCA by Juan3027 viewsGood day
I would like to add some of my pictures about my ZCA build from your site and I must say that this amp sound very good.
Regards
Juan
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JJ-Tesla-Blue-Glass-KT88-Vacuum-Tubes.jpgJJ / Tesla Blue Glass KT88 Tubes3026 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-up3024 viewsOddblock KT77 close-up view. Instructions for this tube amp project can be found on Bruce's KT77 Push-Pull Tube Amp page.
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6SN7-6V6-SE-Black-Lace.jpgBlack Lace - SE 6V6 Amplifier3018 views“Black Lace†- an all Australian tube amplifier with tubes from the 60’s. Miniwatt: 6V6 black glass, 6SN7 and 5U4. Old school build with PIO caps, solder from the 70’s with copper and carbon film resistors. See the forum thread Black Lace - 6V6 power amp, old school for more information.
Mark Houston – retro-thermionic
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BoydOutSideSmall.jpgJAN6418 sub-mini tube preamp kit MKII3010 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.
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