| Random files - DIY Audio Projects |
Tea Box 12AX7 Valve Preamp II444 viewsSee the previous photo for more detail. In this image you can see the solid brass cones, 4oz brass knob and another view of the preamp. The SMPS is contained inside making one very neat and attractive looking valve preamp. Golden Dragons replace standard 12AX7 valves.
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Fostex FE127E FS Fonkens1792 viewsHere is the setup in the basement. The new Audio Nirvana Super 12s are what are sitting on the Fostex FE127E Fonkens. I am breaking them in and will be building bass reflex cabinets soon.
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5687 Valve Preamp - Rear View1488 viewsMy second DIY 5687 Valve Preamp project. This one is housed in a wooden box.
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Underside View of Finished T-Amp Kit 2782 viewsHere is a view from the underside. The large transformer was salvaged from a dead computer UPS. For more details, see the DIY T-Amp project page.
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| Last additions - DIY Audio Projects |
DIY Vacuum Tube (Valve) Prototyping Bread Board7 viewsA simple DIY Vacuum Tube (Valve) Prototyping Test Board used to test single stage tube circuits.
See the DIY Vacuum Tube Prototyping Board post for additional details.Nov 19, 2009
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FostexFE206E in Double Bass Reflex Speaker Enclosure3 viewsThis is the simpler enclosure recommended by Fostex for their high sensitivity FE206E drivers. The large magnet and basket spokes of the driver have been covered with bituminous damping. The upper chamber has sound deadening vinyl across the back and the rest of the upper chamber has double layers of thick Dacron lining it. The boxes are fastened using dowels, glue and wood screws. A Speaker Zobel / Impedance Equalization Circuit is used across the driver terminals. The sound soundstage is pin-point sharp and with good depth. Bass is sufficient without being heavy. For under $AU500 these speakers represent very good value. With a sensitivity of 96 dB/W my 6 W Ultra-Linear Single-Ended valve amps can produce a high sound level.Nov 15, 2009
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retro-thermionic Merlot Amp with JJ KT88 Blue Glass31 viewsNot meaning to hog the Gallery at the moment but lots of development underway with my Merlot KT88 SE UL valve amps. I'll make it short: This is the Merlot amp with matched a pair of JJ KT88 Blue Glass. Sound: weightier bass and sharper mids but the JJs are only hours old.Nov 10, 2009
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KT88 SE UL Tube Power Amplifier78 viewsI had put the partially finished amp in the gallery some weeks back. Now finished not a lot of difference on the outside except for the many silver colored screws on the top plate and some feet. See the other image for the underside shot. After a number of hours of careful listening and listening to it though others CD players, pre-amps and speakers I can say that most liked the sound. SE tube amps produce absolute and exquisite mid-range and silky highs and deep sound stage but this amp has a slightly narrow sound stage presentation. Bass improved and hum vanished with additional PS filter caps. With a brushed Al top plate and Mirabue timber thick timber base, Edcor XSE OPTs and component-2-component wiring on all circuit boards (including rectifier broard) this amp represents a clean and easy build with in-expensive parts. Though low powered (6W+) for a few hundred dollars you can experience the benefits of a tube SE UL design. So easy, so nice!
Here is a link to the KT88 Single-Ended (SE) Schematic I followed.Nov 01, 2009
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