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ZCA_1~1.jpgRadoslav's ZCA (SE class-A mosfet amp)4565 viewsRadoslav's ZCA. It has a massive PS with nearly 68,000uf of filtering and a twin secondary tranni.
Schematic and details are availabe from the project page: DIY Class-A 2SK1058 MOSFET Amplifier.
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12AX7-Tube-Phono-Preamplifier.jpg12AX7 Vacuum Tube Phono Preamplifier4555 viewsOk, so after buying a Sansui SR-1050C Turntable, I needed a phono preamp, so I built one.
This one uses no premium parts, but sounds great. It does have a small amount of 60Hz hum, and I plan on installing some tube shields as I know its been induced by the power transformer as the PS is completely clean. The preamp uses a pair of 12AX7 vacuum tubes.
The power supply uses a MOSFET for regulation and the preamp uses a passive RIAA equalization network.
Bernardo
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00003.jpgCustom PCB4554 viewsI know... its not a printed circuit board... because its not printed... but i made it with love.
You can see the rear of the LM3886 and the power cables.
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6P3S-286L629-Push-Pull-with-E80CC-drivers.jpgE80СС + 6P3S (6L6) Push-Pull4544 viewsIn the second photo E80СС + 6P3S (6L6) push-pull Class-A. This selection of tubes also works with the is in the same HP floppy drive enclosure amplifier.
Rakhmanov Ilya (Рахманов ИльÑ)
Moscow, Russia.
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MC-Step-up-Tranformer.jpgDIY MC Step-up Transformer4530 viewsI the everlasting quest to better audio, I entered the realm of the moving coil phono cartridge with a Denon DL-103. To rise the output voltage of the Denon DL-103, I've build this Step-up transformer with two mic transformer from Edcor , I've use cast iron pipe bend with end plugs to make an electromagnetic shield. RCA connectors are recessed in the back of the pipes which are mounted on a black walnut plinth.
Félix-Antoine (Canada)
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00094.jpgRectifier capacitors4516 viewsWired with the resistors, smaller caps and a cooper cable extension to make easier the soldering and assembly.
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EL34-Push-Pull-Tube-Amp-Kit.jpgMars EL34 Push-Pull Tube Amplifier Kit4509 viewsA tube kit amp available in South Africa. For more information see the EL34 Tube Amplifier Kit thread on the forum.
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50EH5-DIY-Tube-Amp-Rear.jpgDIY 50EH5 SE Tube Amp - Rear View4505 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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Blue_Velvet_Pre_Amp.jpgThe Blue Velvet Tube Pre-Amplifier4487 viewsMy second tube audio DIY project, The Blue Velvet tube Preamp by Dick Olsher.
The only changes from the original schematic is the use of a 6X5GT tube rectifier. This is an excellent preamp. The 6SN7 tubes by KENRAD gives deep lows and velvet mids - highs. Coupling caps are Mundorf Silver Oil 0.68μF.
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Nelson-Pass-Bride-of-Zen-BoZ-Preamp-Aluminium-Case.jpgNelson Pass Bride of Zen (BoZ) Preamp - Aluminum Case4473 viewsThe finished Nelson Pass Bride of Zen (BoZ) Preamplifier. Where I though the Nelson Pass B1 buffer had excellent bass, the BoZ came in and made bass reproduction even heavier. Not more extended just weightier. Mid range and treble are extended and detailed. The Hammond aluminum cases sure are smart. You need a very, very quiet PS for this preamp. Any hum just leaches right through.
There is more info and notes in the JFET BoZ (Bride of Zen by Nelson Pass) thread on the forum.
Mark Houston (Australia)
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TSpecial.JPG6T9 4.7W DIY Tube Amplifier in a Baking Pan4450 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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6L6-5881-SE-Valve-Amp.jpgSingle-Ended (SE) 6L6 / 6L6GC / 5881 Valve Amp4444 views6SJ7 or 6SD7 (pentode) driver stage. 6L6 or 5881 output stage (Sovtek 5881WXT shown). Solid state power supply, DC heaters.
OPT covers are made from copper clad board and enclosure is aluminum.
See the DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier project page for more information.
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Hiraga-MC-Phono-Preamplifier.jpgHiraga MC Phono Preamplifier4430 viewsFinding I liked Moving Coil cartridges I tried my hand at yet another MC preamp. This one is a Jean Hiraga design and uses matched low noise bipolar transistors pairs and a +/- 6V source. The transistors Hiraga specifies are no longer available. But better replacements are the Analog Devices SSM2220 chips at $11 each (you need two). Hiraga specifies very large storage caps so I juiced this compact build with 1F (1,000,000uF). Plus I added 220uF low ESR caps and 0.22uF snubbers for better mid-range performance. Since this image I mounted an external switch to select between 220, 100 and 45 ohms of loading. A 25 turn trim pot allows adjustment of "0" volts on the input and Russian PIO caps decouple the output.
Mark – Mongrel Dog Audio
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00095.jpgMaking the chassis, rear view4425 viewsPutting together the plastic and the metal, rear view.
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DIY-SE-Class-A-Mosfet-Amp.jpgClass-A 2SK1058 Renesas Mosfet Single-Ended Amp in Heatsink Enclosure4422 viewsThis is a build of Mark Houston's DIY Class-A 2SK1058 MOSFET Amplifier which was built without circuit board in order to have the shortest connections as possible and to meet the tradition of valve amps. The heatsinks of the fanless enclosure are heating up to little more than 40° C
Stefan - Germany
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little-amp.jpg50L6GT Tube Amplifier4408 viewsThis little guy is something I came up with when a friend asked me if there was an inexpensive, but decent vacuum tube amplifier he could build. Well, it is low cost and sounds acceptable, but it is dangerous as one side of the AC line is connected to the chassis. Yes, I used a polarized plug, but it also depends on the receptacle being wired correctly... so I recommended that he should build it with an isolation transformer.
It uses two 50L6GT output tubes driven with a 12AX7A. The heaters are series strung with a 68 ohm resistor to take up the remaining 8 volts. The powersupply uses a 1N4005 half-wave rectifier, so it was a bit difficult to filter out the 60 Hz buzz.
For something cheap, it doesn't sound half bad. Though, it doesn't hold a candle to my 6T9 Push-Pull Tube Amplifier!
-Steve (z-strat)
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Prada_1.jpgPrada OPA627 Preamplifier4406 viewsUsing my daughter's Prada phone box (heavy cardboard) I fashioned this preamplifier around the Bur Brown (high performance) OPA627AP opamp ($AU50). It is a single stage preamp and powered by four lithium 9V batteries for a PS of 18V.
The black knob is solid brass and the attenuator is an Alps Blue Velvet. Gold RCA jacks, silver wire and WBT silver solder are used throughout.
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IMG_3492.jpgTesting of active crossover4403 viewsThe active crossover is using Rod Elliot's P09 design and is 24db/octave Linkwitz-Riley crossed at 3500Hz. Op amps are cheap TL072 and the sound is still great. Transients are not lost whatsoever.
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50EH5-DIY-Tube-Amplifier.jpgDIY 50EH5 Single Ended Tube Amplifier4400 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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BattMMPreSmall-2.jpgMM Phono Preamp (battery powered)4399 viewsMy second build of the Jaycar MM phono preamp kit is house in a sleek enclosure and runs from Three 9V lithium batteries. An Alps Blue Velvet potentiometer is topped off with a solid brass black chrome knob. The preamp is very smooth sounding and better than my earlier version which uses an AC supply and regulators on board. See the MM Phono Preamp (battery powered) - inside image for an internal sview.
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