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Philips_EL6431_Amplifier.jpgPhilips EL6431 Amplifier3010 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)
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DSCN0290_Small.jpgAnother version PP UL Oddblock 6P3S & ECC83 Tungsram2992 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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Push-Pull-6F6S-286F629-Tube-Amp-with-ECC82-driver.jpgPush-pull 6F6S (6F6) Tube Amplifier with EСС82 input2990 viewsPush-pull 6F6S (6F6) amplifier. The input stage is an EСС82 with a large anode. The amplifier has been built into an old HP 5.25" floppy drive (fantastic steel!!!).
The input stage is made by Williamson, after the phase shifter with a split load and paper-in-oil capacitors. Displacement of the output stage is automatic, inclusion of a pure pentode. The amplifier operates in pure class-A. The output stage can be used with 6P6S and 6V6 tubes without any changes. There is no feedback used in this amp. The cathode resistor of preamp halves EСС82 are NOT capacitor shunted. The input connectors are Amphenol BNC and the output contacts are from an old laboratory equipment HP.
With best regards,
Rakhmanov Ilya (Рахманов ИльÑ), Moscow, Russia.
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Genalex-Gold-Lion-KT88-Vacuum-Tubes.jpgGenalex Gold Lion KT88 Vacuum Tubes2976 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.
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DSCN0084s.jpgSE RCA 2A3 Triode Tube Amp2974 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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KT120_IIs.jpgBe Bamp with KT120 Tung-Sol tubes2974 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.
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Voxativ-Ampeggio-Back-Loaded-Horn-Speaker.jpgVoxativ Ampeggio Back Loaded Horn Speaker2972 viewsThe Voxativ Ampeggio Back Loaded Horn Speaker on display at the 2011 Salon Son & Image show.
The Ampeggio uses the Voxativ AC-3X and the sensitivity is 101 dB / 1w / 1m.
For more information see the Voxativ Ampeggio Horn Speakers - SSI 2011 show report.
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tube_amplifier.jpg5692 / 8417 SE Tube Amplifier2966 viewsThis amplifier was built to reproduce music playback with high fidelity. The sound is light and natural. One doesn't get tired of listening to it for many hours. The voice sounds softly and naturally without tension. The amplifier has great microdynamics. The preamp is built based on tube 5692. The power amplifier uses tubes 8417. The tubes can be replaced with different ones: 6L6, 6L6GC, KT88, 6V6 and alike. In this case, the current of the output tubes can be tuned. The output transformers are Hashimoto HC-507U 5K. For more pictures, please visit http://alexkap.com
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PhonoTubePreampMkIIInsideS.jpgOatley Electronics K282 JAN 6418 valve phono preamp2962 viewsMy second build of the Oatley Electronics JAN 6418 valve phono preamp kit. This time no switch mode power supply and metal film resistors and better polypropylene capacitors replace the basic kit components.
For details about the upgrades I made to the basic kit, see my review of the 6418 Tube (Valve) RIAA Phono Preamplifier Kit.
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OddWatt-KT77-Push-Pull-Tube-Amp-Kit.jpgOddWatt / OddBlocks KT77 Push-Pull Tube Amp Kit2960 viewsA photograph of a finished OddWatt / OddBlock KT77 Push-Pull Tube Amplifier Kit. The KT77 tube amp kit is available from OddWattAudio.com. The kit comes with a NOS JAN Philips Branded 5751 (US made) and new production JJ branded KT77 tubes (Russian made).
Complete instructions to build a similar DIY version of the amp are available on the Oddwatt 225 - 6SL7 SRPP / KT77 SIPP (Push-Pull) Tube Amplifier project page.
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OatleyPhonoPreFinisS.jpgMongrel Dog Audio JAN6418 tube phono preamp2937 viewsThis is a new tube phono preamp kit from Oatley Electronics based around the JAN 6418 sub-miniature pentode tubes. The phono preamp kit has been housed in a cast aluminum enclosure with a Hammered Copper finish. Inside the enclosure bitumanised aluminum foil lines the lid and top. Gold RCAs grace the back. The sound reproduction is full bodied with deep bass, bright mids and highs. This phono preamp may out perform my OPAMP unit.
There are more details about my experience with this inexpensive little phono preamp amp kit on the 6418 Tube RIAA Stereo Phono Preamplifier Kit project page.
Mark Houston
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IMG_2142.JPGGlowing 12X4 Tube2932 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.
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6DJ8-6AS7-OTL-HP-Amp-Sanguine.jpgSanguine - 6AS7 OTL Headphone Amplifier2929 viewsThe power supply and amp section are on two die-cast Al bases. A Sophia Mesh Plate Princess 274B rec. tube does the rectification. The PS has its own power filter to reduce EMI\RFI and the mains cable is choked. The power transformer is Hammond and the 20H choke is Hammond also and these are both isolated from the chassis by rubber grommets to control vibration. The 6AS7 power tube is NOS Winged "C" Svetlana and a NOS Tesla E88CC gold pin for the driver and is directly coupled. XLRs connect the HT and AC filament current to the amp section. A single 6.5mm input upfront with dual headphone output. Attenuation is provided by an Alps Blue Velvet pot. Both enclosures are dampened with bituminous Al foil and the paint is Epoxy Enamel. The attenuator knob is 4 ounces of solid brass.
The Sophia Mesh Plate 274B rec. tube and a 4uf PIO Russian filter cap start the filtering network with seven stages of filtering and storage in all. There is no PCBs or shielded wire used in this amp to dull the sound. Wiring is all point-2-point and component-2-componet. Fine silver plated wire warp wire carries all the audio. The only caps in the amp are the output caps. WBT silver solder is used throughout.
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TeaBoxInsideSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with External 5Y3 Power Supply2923 viewsIn this build I used the Jensen copper, paper and oil caps for the input, output and inter-stage coupling and Solen Teflon for the feedback capacitor. The preamp is a two stage triode (12AX7s AWA-Australian) with global feedback and is the original Silicon Chip design with some modifications. They are bigger caps all round and no printed cct. brd. Construction of brds. was component-2-component wiring which means there is NO additional wire used on the brd. construction. At the brd. level this is better than point-2-point wiring. This cuts down on soldered connections/junctions and cct. length. All 99.999% pure silver wire with heat shrink insulation is used in the signal path to connect brds. to RCAs and Alps blue velvet pot etc. Medium gauge OFC hook-up wire brings power to the brds. Heavy bituminised Al foil lines the light timber case to provide a ground plain and RFI/EMI shielding. The remote PS employs a 5Y3 rec. tube (Australian made in this case) Hammond 370X power tranni 193B 12H choke.
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Digital_Pictures_1_031.jpgKT77 OddWatt (Push-Pull with CCS)2922 viewsFinished KT77 OddBlocks by rparsh
This build follows the KT77 Push-Pull Tube Amp instructions by Bruce but as mono-blocks.
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_63-Fender-Reverb-Clone.jpg'63 Fender Reverb Clone2921 viewsHere is a photo of the last project I built. It is a rear view with the cover removed. It is a modernized clone of a '63 Fender Reverb. I changed a few things like using modern grounding and layout methods I went with larger filter caps a full wave bridge rectifier. I think I used a slightly nicer spring suspension system to "fly" the pan in it's shock isolation mounting. The input jack is grounded to the chassis but the other jacks are isolated. There are two transformers and one choke, all are made in USA with paper insulation. The enclosure is Maple. The sound is very true to the vintage Fender. It goes from very subtle to full-on spring/twang.
Chris A.- California, USA
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KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpgKT88 Push-Pull Tube Amplifier with 12SL7 Driver2915 viewsKT88 Push-Pull Tube Amplifier with a 12SL7 Driver stage and a 6NO30 thermal delay relay tube. The amplifier is build following Bruce's 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp build. The power tubes are new production KT88 Gold Lions made by Genalex.
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Listening-Room-Nikola-Azazello.jpgNikola's (Azazello) Tube Listening Room2914 viewsPhotograph of my tube amplifier in my listening room.
From left to right on the shelf:
SE 6Ф3П
SE 2A3 RCA
OTL 6AS7
EL11 Telefunken
PP 6П3С (variant of Leibowitz circuit)
From left to right on the floor:
PP 6005 - variant Leibowitz
SE 300B JJ
SE 6С4С
SE EL11 Tungsram
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Dons-300B-Tube-Amplifier.jpgDon's Compact 300B Amplifier2910 viewsDon has build this exquisitely compact 300B on one of his fine Spotted Gum bases. He uses ABS for the top plate with no bottom plate. He doesn’t believe in them. The 300Bs and 6SN7 are Chinese made “Electron Tube†– Shuguang . All components underneath are high-end. Though Don is on a pension he always uses the best passive parts but skimps on the tubes. The rec. tube is a Golden Dragon 5U4. The horizontal power tranni, OPTs and choke are locally wound by Dyne and are expensive. The best amp I have heard of Dons is his 2A3 which I intend to re-borrow. This amp is new and may improve with time but for now both the top end and bottom end are a little crippled. Mids don’t sound fast and slightly masked. BUT this may all change with time. It does play very loud though on a large 3 way Osborn Eclipse @91db efficient.
Mark – retro-thermionic
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Digital_Pictures_1_006.jpgKT77 Push-Pull Tube Amp (OddWatt)2909 viewsEven KT77s reach temps of around 225F Good bright heaters too. From rparsh.
Schematics are on the KT77 Push-Pull Tube Amplifier project page.
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