Vacuum Tube (Valve) Audio Projects
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DIY-KT77-Push-Pull-Tube-Amp.jpgDIY KT77 Push Pull Tube Amplifier2590 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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EL84-CCS-Push-Pull-Tube-Amp.jpgEL84 / 6BQ5 Push Pull Tube Amplifier2628 viewsThe "OddWatt", a EL84 / 6BQ5 Push Pull (PP) Tube Amp project. SRPP input stage and ultra linear output stage with LM317 Regulators CCS. Tube heaters are 12VDC.
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DIY-EL84-Push-Pull-Tube-Amp.jpgDIY EL84 / 6BQ5 Push Pull Tube Amp3221 viewsThe first "OddWatt" project. This is an DIY EL84 / 6BQ5 Push-Pull Tube Amplifier. The input stage is a SRPP using ECC802S tubes, while the output stage is ultra linear. LM317 Regulators are used as constant current sources (CCS) for the output stages. DC is used for the tube heaters.
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12AU7-Tube-Cathode-Follower-Preamp.JPG12AU7 Cathode Follower Tube Preamplifier3460 viewsThis is a DIY 12AU7 vacuum tube preamp. Rectifier is a 6X5GT, and voltage regulator is an 0D3 tube.
Here are more details about this DIY 12AU7 Tube preamplifier.
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DIY-12AU7-Cathode-Follower-Preamp.JPGDIY 12AU7 Cathode Follower Tube Preamp3207 viewsA Foreplay inspired 12AU7 vacuum tube preamplifier. This is an all tube build, rectified with a 6X5GT, and regulated using an 0D3.
More details about my DIY 12AU7 Tube preamp.
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TSpecialUnderChassis.JPGUnderside view of the 6T9 baking pan tube amp3446 viewsThe OPTs and printed cct. brd. fit snugly in the thin baking pan chassis making a compact little amp. Drilling such a thin chassis has its challenges and getting all the drilled points to line up with cct. brd. mounting holes can be frustrating. This amp is a poor performer under the CRO but produces an astounding stereo image. It plays small classic quartets, jazz groups and most voice and piano based music well. You need at least 90dB efficient speakers that can go deep for good listening. See the 6T9 Tube Amplifier Project page for more info.
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TSpecial.JPG6T9 4.7W DIY Tube Amplifier in a Baking Pan3796 viewsA Tube amp kit based on Spare Time Gizmo's printed circuit boards which are plated through, solder masked and screen printed. I sourced common components from the local electronics shop but used a pair of NOS GEC 6T9, Alps potentiometer, solid brass knob and a Hammond power transformer. The chassis is a Teflon coated backing pan ($7). The OPTs are custom wound toroidals. The amp is a little bass shy. Doubling the 100uF power caps helped increase bass. See the 6T9 Tube Amplifier Project for more details.
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Bottlehead-Seduction-Phono-Preamp-Top.jpgFinished Bottlehead Seduction Tube Phono Preamp3547 viewsA finished view of the Bottlehead Seduction Tube Phono Preamp kit.
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Bottlehead-Seduction-Phono-Preamp.jpgUnderside View of Bottlehead Seduction DIY Tube Phono Preamp Kit3701 viewsThis is the inside view of the Bottlehead Seduction DIY Tube Phono Preamp Kit. All connections are point to point.
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Bottlehead-Seduction-Phono-Preamp-6922-Tube.jpgBottlehead Seduction Phono Preamp with 6922 Tube3667 viewsClose up of the Electro Harmonix 6922 Tube on the Bottlehead Seduction DIY Tube Phono Preamplifier Kit.
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IMAGE_145.jpgOne valve (tube) 60W guitar amplifier3786 viewsThis guitar amp comprises of one $1000 radio transmitter valve which runs on 700Volts. The driver cct. is on the left and is a multi-stage transistor unit. The OPT on the right was wound by the owner using a primary/secondary interlace config. and then vacuum impregnated. A fan is required at the base of the valve to stop the ceramic socket over-heating. Very loud!
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5687-Tube-CD-Linestage.jpg5687 Tube Linestage3309 viewsHere I am using a diy 5687 tube preamp as a line stage for a Sony CD player.
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STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82) - inside3817 viewsInside view of a STA1 tube preamp kit from Lighthouse Electric. This a three stage design using 12AU7 tubes.
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STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82)4338 viewsThis is my finished STA1 tube preamp kit from Lighthouse Electric. This design uses three 12AU7 tubes. I prefer the 12AX7 tube preamp kit that I built over the STA1.
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12AX7-Tube-Preamp-Kit.jpgDIY 12AX7 Tube Preamplifier Kit4958 viewsThis is my build of the Silicon Chip Magazine 12AX7 DIY Tube Preamplifier Kit. All of the coupling capacitors were upgraded to Auricaps. The volume control is an ALPS pot from Radio Shack
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50EH5-DIY-Tube-Amp-Rear.jpgDIY 50EH5 SE Tube Amp - Rear View3922 viewsThis tube amp is based on Giovanni's DIY 50EH5 SE Tube Amplifier. The enclosure is a black painted metal cookie tin.
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50EH5-DIY-Tube-Amplifier.jpgDIY 50EH5 Single Ended Tube Amplifier3765 viewsThis is my build of Giovanni's DIY 50EH5 Single Ended Tube Amplifier. The enclosure is a metal cookie box that has been painted black. The transformers were custom wound by a local guy.
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DIY-6NS7-KT88-Tube-Monoblocks.jpgDIY 6NS7-KT88 Monoblock Tube Amps4830 viewsI purchased these extreme valve monoblocks from Dan in Australia, who built them from the ground up, for a song. They are based on the uni-amp cct. brd. You can plug and play KT88(s), 6L6(s) and EL34(s) output valves and switch between pentode and triode mode. The transformers are oversized and were special wound for Dan. Each block weighs over 22kg. The input and driver tubes are Golden Dragon 6SN7(s) with tube rectification. It uses tranni input coupling. Power is 27W.
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DIY-5687-Tube-Preamplifier.jpgDIY 5687 Tube Preamplifier4967 viewsThis is my first DIY 5687 tube preamplifier. Sounds great for such a simple preamp. Front view.
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DIY-5687-Tube-Preamp-Rear.jpgDIY 5687 Tube Preamp - Rear View4301 viewsRear view of my first 5687 tube preamp project. It sounds great for such a simple preamp.
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