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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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DIY-Panasonic-Fullrange-Speaker.jpg
DIY-Panasonic-Fullrange-Speaker.jpgPanasonic Fullrange Speakers7672 viewsThese are speakers I built using Panasonic Fullrange Drivers for my Single Ended EL84 Tube Amp.Nov 29, 2008
EL84-Single-Ended-Tube-Amp.jpg
EL84-Single-Ended-Tube-Amp.jpgTesting a DIY SE EL84 Tube Amp4849 viewsHere I am testing the Single Ended EL84 Stereo Amplifier. The whole AMP fits on a 100 by 160 mm DIY PCB. A double triode ECC88 / 6DJ8 or ECC82 tube is used to amplify the input signal. See other photo for the finished amplifier and more details.Nov 29, 2008
Fostex-FE206E-BLH.jpg
Fostex-FE206E-BLH.jpgFostex FE206E in Back Loaded Horn Enclosure8635 viewsBack Loaded Horn Speaker using the Fostex FE206E fullrange driver.Nov 29, 2008
DIY-KT88-Single-Ended-Tube-Amp~2.jpg
DIY-KT88-Single-Ended-Tube-Amp~2.jpgDIY KT88 Single Ended Tube Amplifier3711 viewsSingle Ended Tube Amplifier after Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.Nov 29, 2008
Fostex-FE127E-DIY-Bookshelf-Speakers.jpg
Fostex-FE127E-DIY-Bookshelf-Speakers.jpgFostex FE127E DIY Bookshelf Speakers6765 viewsDIY Bookshelf Speakers using the Fostex FE127E fullrange speaker driver. Nov 25, 2008
Fostex-GK120-Speakers-with-F120A.jpg
Fostex-GK120-Speakers-with-F120A.jpgFostex GK120 Speakers with F120A4100 viewsHello - this is a hard to locate set of speakers! The cabinet is a rare speaker enclosure from Fostex - model GK120. The speaker in each cabinet is the famous F120A. The set operates flawlessly - both aesthetically as well as acoustically. The wood (though I do not know the type) is solid and very nice. The enclosures themselves are made of a see-through Lucite and are definitely a conversion piece.Nov 25, 2008
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0006sa0w.jpegOTL 6082 amplifier3826 viewsThis is my latest (work in progress) amplifier. It is a transformerless design using 6082's in the output stage. 6082's are 26.5 volt 6AS7GA's which were originally designed for series pass regulator service. More information can be found at the bottom this webpage.
http://userpages.bright.net/~geary/misc/radiohandbook.html

Steve Geary (z-strat)
Nov 13, 2008
SV101939.JPG
SV101939.JPGVintage Sony TAN-5550 and TAE-54503185 viewsPat from the Melbourne Audio Club picked up these very nice Sony VFET preamp and power amp combo for a song. The power amp uses a JFET front end but derives its power from an array of VFETs to produce 65W into 8ohms. The preamp has more filters, dual tone controls, inputs and outputs than you can shake a power cord at.

This combo drove my moddified Tandy Minimus 77s with a replacement Al/Mg 4" HiVi woofer/mid at good volume with a very controlled solid bass sound I would only have expected from much bigger speakers. Mids were warm and treble mellow. The Sony represents a great collectors piece.
Nov 02, 2008
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DSCF1666~0.JPGTransmission Line for Jordan JX9256666 viewsThe Jordan JX92S fullrange drivers look great in this beautifully made transmission line enclosure. Pat from the Melbourne Audio Club drives them with either a pair of valve monoblocks or other SS amps he owns. These including a Sony vintage VFET power amp preamp combo.

Nov 02, 2008
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DSCF1552~3.JPGTransmission Line boxes for Jordan JX92S9854 viewsThese were built by a Melbourne Audio Club member for a pair of Jordan JX92S fullrange speakers (see other image).
Nov 02, 2008
KT88-Push-Pull-Tube-Amplifier.jpg
KT88-Push-Pull-Tube-Amplifier.jpgMonoblock KT88 Push-Pull Tube Amplifier2850 viewsPhoto of a KT88 Odd Block without the protective cage. This tube amp design will work with a number of octal tubes (KT77, 6CA7, EL34, 6L6GC, KT88, KT90 and 6550). SRPP driver stage using a 12SL7 tube. Output stage is a Class A Ultra-Linear SIPP with Gold Lion KT88 vacuum tubes. LM317 Regulators are used to provide the cathode CCS.

For more information, see the 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp project page.
Oct 29, 2008
KT88-Push-Pull-Tube-Amplifier-Cover.jpg
KT88-Push-Pull-Tube-Amplifier-Cover.jpgKT88 Push-Pull Tube Amplifier (monoblock)2698 viewsThe third of the "OddWatt" tube amp projects. This one is the Odd Blocks which will work with a number of octal tubes (KT77, 6CA7, EL34, 6L6GC, KT88, KT90, 6550). The driver stage is an SRPP using a 12SL7 tube. For the amp shown above, the output stage is a Class A UL SIPP using Gold Lion KT88 vacuum tubes. LM317 Regulators are used to provide the cathode CCS.

For more information, see the 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp project page.
Oct 29, 2008
little-amp.jpg
little-amp.jpg50L6GT Tube Amplifier3519 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)
Oct 28, 2008
Simple-SE-6L6GC-Tube-Amp.jpg
Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit3311 viewsFront view of the Simple SE Tube Amplifier using a PCB from tubelab.com. Rectifier tube is 5AR4/GZ34, input tube is 12AT7/ECC81 and power/output tubes are 6L6GC. The audio output transformers are from Edcor.Oct 26, 2008
Simple-SE-6L6GC-Tube-Amplifier-Kit.jpg
Simple-SE-6L6GC-Tube-Amplifier-Kit.jpgSimple SE 6L6GC Tube Amplifier Kit2983 viewsTop view of the Simple SE Tube Amplifier using a PCB from tubelab.com. 6L6GC tubes and Edcor output transformers.Oct 26, 2008
TubeLab-Simple-SE-6L6GC-Tube-Amp.jpg
TubeLab-Simple-SE-6L6GC-Tube-Amp.jpgTubeLab Simple SE 6L6GC Tube Amp3385 viewsUnderside view of the Simple SE Tube Amplifier using a PCB from tubelab.com. The motor run capacitor is 90uF / 370V. The choke is a Triad C-14X which is 6H 150 ohm and rated at 200 mA. This amp really runs dead silent - no hum whatsoever with my 93 dB Polk Speakers.Oct 26, 2008
OTL-Tube-Headphone-Amplifier.jpg
OTL-Tube-Headphone-Amplifier.jpgOTL Tube Headphone Amplifier4025 viewsThis is a picture of a tube headphone amp that I was building but gave up as I could not get it to work properly.Oct 26, 2008
diy-cat5-speaker-cable.jpg
diy-cat5-speaker-cable.jpgDIY CAT5 Speaker Cables10458 viewsDIY Speaker Cables made using Category 5 (CAT5) network wire. The Cat5 cables are braided together as shown in the photo and terminated using banana plugs.Oct 26, 2008
DIY-Phono-Turntable-3~9.jpg
DIY-Phono-Turntable-3~9.jpgDIY Phono Turntable Project10129 viewsI used MDF filled with concrete / latex added to mix then veneered with Quilted Maple. The bearing is High grade SS and the cup is made of Oilite. The spikes are 2 piece with a rubber damper inside. The Motor is powered by a UPS battery enclosed in the small matching box.
Doug M
Oct 21, 2008
DIY-Phono-Turntable-2.jpg
DIY-Phono-Turntable-2.jpgDIY Turntable Project8708 viewsDIY turntable project. I used MDF filled with concrete / latex added to mix then veneered with Quilted Maple. The bearing is High grade SS and the cup is made of Oilite. The spikes are 2 piece with a rubber damper inside. The Motor is powered by a UPS battery enclosed in the small matching box.
Doug M
Oct 21, 2008
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