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| 416 files in 8 albums and 2 categories with 5 comments viewed 545661 times |
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25EH5 / 50EH5 Tube Amplifier535 viewsAnother view of the amplifier from the top. As you can see, I was using headphones as I took the effort of adding a jack with impedance matching resistors so I could listen to my music in peace. The funny thing is that I can apply just about any load to the amplifier without any audible change other than volume.
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DIY Jordan JX92 Tower Loudspeakers1317 viewsTower speaker project made around the very well regarded Jordan JX92S Full Range Speaker. The speaker box is a floor standing bass reflex enclosure. For full details about this DIY speaker project, see the DIY Jordan JX92S Bass Reflex Tower Loudspeaker page.
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LM3875 Gainclone Enclosure2956 viewsFinal shot of my DIY Gainclone project.
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Hi-Vi Tower-Speaker Project2815 viewsTower loudspeaker project using all Hi-Vi drivers. See the DIY Hi-Vi 3-Way Tower Loudspeaker Project page for more info.
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KT88 SE UL tube power amp-finished31 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!Nov 01, 2009
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KT88 SE UL tube power amp-underside34 viewsThe underside of a KT88 SE UL power amp consists of, Edcor XSE series OPT, Hammond 10H choke, rectifier unit with SF diodes and 200uF of filtering. Turret boards were used for the KT88 sockets (ceramic), cathode resistors and bypass caps. All other components are wired, point-to-point, on a smaller circuit board X2 caps are used for the coupling caps. All component are inexpensive and readily available. The amp suffered from hum until the filter caps were increased. 100uF before and after the choke are required. The PS delivers a very quiet 410V. 30V is dropped across the cathode resistors which provide the biasing to the power tubes. At idle 63mA is drawn per tube. The sound is extended and detailed with a 6W delivery. Excellent sound stage depth. Frequency range is from 35Hz to 46kHz (-3dB points).Oct 31, 2009
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5751 SRPP / EL84 (6BQ5) Push-Pull Tube Amp (PoddWatt)63 viewsAnother OddWatt tube amplifier. This one uses EL84 / 6BQ5 tubes in a self-inverting push-pull topology for the output stage driven by a 5751 SRPP. The gain is sufficient to allow direct connection to a portable mp3 player. As will all the OddWatt amplifiers, it measures very well and Bruce reports that it sounds very good. See the 5751 SRPP / EL84 (6BQ5) Push-Pull DIY Tube Amplifier project page for full details.Oct 19, 2009
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6V6 12AX7 Stereo Amp133 viewsLittle stereo vacuum tube amplifier built for a friend who wanted a tube stereo at minimal cost. It used mainly parts on hand, including a vintage radio power transformer, vintage tube sockets, and NOS 5 watt Zenith audio output transformers made for 6V6 single-ended output stages. The driver tube is 12AX7 and the tube rectifier is 5Y3G. Output tubes are old Zenith 6V6G tubes, the tall ones that look prettier than the GT style. The tube amp delivers great sound with an MP3 player as the audio source.Oct 10, 2009
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