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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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Nigel-K-12G-Tube-Amplifier-Kit-Build~1.jpg
Nigel-K-12G-Tube-Amplifier-Kit-Build~1.jpgK-12G Tube Amplifier Kit Build5230 viewsNigel's build of a K-12G Tube Amplifier Kit.

For full details of Nigel's build, see his K-12G Tube Amp Kit Build thread.
Jun 28, 2010
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photo-4.jpgBob's Dynaco ST-35 with VU Meter2629 viewsTube amp using Dynaco ST-35, Edcor iron and a plasma VU meter using IN-13 nixie tubes.Jun 28, 2010
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KT120_IIs.jpgBe Bamp with KT120 Tung-Sol tubes2394 viewsA fellow builder had bought a pair of these tubes and claimed they were an improvement over KT88s and others. I had to try for myself. Just dropping in the tubes in where the JJ Blues Glass KT88s once were gave me a 2W improvement in my SE UL bread board amp raising the power to 9.7W. Bass is far more controlled and mid-range crisper and clearer. Idle current is 112mA up from 93mA and HT+ is 400V with bias at 34V. Operation is class A. These tubes are not only impressive looking but have improved the performance of the amp. +/- 3db points are 26hz to 36khz.Jun 25, 2010
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DSCF0800-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier5127 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
Jun 18, 2010
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DSCF0797-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier5182 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
Jun 18, 2010
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DSCF0795-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier3804 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
Jun 18, 2010
DSCF0794-C.JPG
DSCF0794-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier3805 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
Jun 18, 2010
DSCN0290_Small.jpg
DSCN0290_Small.jpgAnother version PP UL Oddblock 6P3S & ECC83 Tungsram2408 viewsAnother version PP UL Oddblock. This one uses 6P3S & ECC83 Tungsram tubes.

See the OddWatt KT88 tube amplifier project page for information about the circuit.
Jun 15, 2010
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6v6amp.jpg6V6 SE Tube Amplifier2215 viewsA small 2 tube amplifier with a 6V6 tube used for the output and a 6N7 general-purpose double triode used as pre amp tube. For full details see http://diy-rbt2.tripod.com Jun 05, 2010
K281FrontS.jpg
K281FrontS.jpgOatley Electronics sub-mini tube/chip amp hybrid K2813237 viewsAn image of the front panel of the Oatley Electronics of Australia tube and chip hybrid power amp. You can see the UV leds which indicate when the amp modules are powered. The amp comprises two K281 kits and is dual mono construction.

After extensive listening I am convinced this is a very good combination of tubes and chip in one integrated power amp. Sound stage in deep with each performer or instrument have their own space on that stage. Holographic.
Jun 01, 2010
OatleyK281.jpg
OatleyK281.jpgOatley Electronics sub-mini tube/chip amp hybrid K2814356 viewsThere has been a number of hybrids over the years but none more unusual than Oatley Electronics, of Sydney Australia’s, Jan6418/LM1875 kit amp. Not crazy enough for you? How about we throw in a 24VDC International regulated switch mode power supply and build the finished amp as a dual mono construction? Crazy? You expected less from Australian Justic Branko owner of Oatley? Still not crazy enough? How about the amp only puts out 5W. Yes the chip is capable of 20W easy! Think what you can do with this kit.
This is my dead stock, out of the box build. And it sounds bloody great! Good sonic depth with chip amp holographic sound stage and tight, exceptionally controlled bass. And all for AU$29 plus shipping. Nuts!!! Not crazy enough. I added twin UV LEDs on the front panel to indicate when both modules are powered. That’s Crazy.
May 31, 2010
BBAmpDriverFrontS.jpg
BBAmpDriverFrontS.jpgRemote driver stage for Be Bamp in a tea box1862 viewsTo increase the volume level of the Bread Board amp (Be Bamp) a driver stage was built. This is the original cct. used in the Merlot amps with some components upgraded. The is no volume control or input cap and pure silver wire used in the signal path. Russian Military caps (paper and foil) were used for the inter-stage caps. Low ESR caps used where possible. The timber box is bitumanized Al foil lined. Tube is a Russian 6N1P.

The Be Bamp can now deliver full volume to the point of clipping. Well short of clipping a high volume level can be obtained with large 91db sensitive 3-way tower speakers. With the driver stage being remote other driver stages can be matched to the power stage and share the power supply. This provides another level of experimentation and flexibility with the over-all system.
May 20, 2010
BBAmpDriverS.jpg
BBAmpDriverS.jpgRemote driver stage for Be Bamp - rear view2060 viewsRear view of my Tea Box 6N1P remote driver stage for the Bread Board KT88 SE UL tube amp.

May 20, 2010
BBAmpS.jpg
BBAmpS.jpgBBAmp (BeBamp) bread board tube amp with no driver stage.2522 viewsI wanted to see if I could drive a SE UL tube power stage from a two stage tube preamp. This bread board amp (BBAmp - BeBamp) was constructed to test the theory. Most bread board amps have the wiring exposed. I wanted this to look and sound excellent so all wiring is underneath the bread board. There are lots of exposed components e.g. rectifier components, but all wiring is hidden. The bread board is Australian pine, sanded and treated with Australian beeswax. Edcor OPTs are enclosed in the aluminum case (back right) which provides a back plate for speaker posts and input RCAs. The amp is absolutely dead quiet and extremely transparent. The amp will produce the sonic signature of your preamp. A high gain preamp and very sensitive speakers are required. This can be shipped as a modular bread board kit amp. The tubes are JJ Blue Glass KT88.Apr 30, 2010
BBAmpRears.jpg
BBAmpRears.jpgBBAmp (BeBamp) bread board tube amp with no driver stage2135 viewsThis is this the rear of the bread board power amp showing the OPT case with speaker binding posts and RCAs. The On/Off switch and fuse cane be seen from here. Because the OPTs were of open construction I placed them in a metal case which doubled as a terminal block for speakers and input RCAs. The tubes are JJ Blue Glass KT88.Apr 30, 2010
Fostex-FF85K-Eminence-Alpha-15A-Open-Baffle-Speaker~4.jpg
Fostex-FF85K-Eminence-Alpha-15A-Open-Baffle-Speaker~4.jpgFostex FF85K / Eminence Alpha 15A Open Baffle Speaker9479 viewsOpen Baffle speakers put together by Keith. They use the 3" Fostex FF85K fullrange driver for the mid and top and the 15" Eminence Alpha 15A for the bottom. Sorry I did not get the crossover details.

The little speaker in the corner is a Tang Band D4-1 DIY Back Horn Speaker Kit.
Apr 27, 2010
Freds-Place-SAR-Labs-STA80.jpg
Freds-Place-SAR-Labs-STA80.jpgListening Session at Fred's Place - April 20106098 viewsPhoto of the listening session over at Fred's place in April 2010. Components shown in the photo are:
SAR Labs STA80 KT88 Tube Amp with JJ KT88 Blue Glass tubes (top left)

OddWatt Audio DIY KT88 Push-Pull Monoblock Tube Amp Kits with Gold Lion KT88 tubes (bottom middle) put together by Gio.

The small speakers are from a Tang Band D4-1 DIY Back Horn Speaker Kit put together by Gio.

And the large Fostex FF85K Eminence Alpha 15A Open Baffle Speaker were built by Keith.
Apr 27, 2010
SAR-Labs-STA80-KT88-PP-Tube-Amp.jpg
SAR-Labs-STA80-KT88-PP-Tube-Amp.jpgSAR Labs STA80 KT88 Tube Amp2327 viewsShot of a Scientific Audio Research Labs (SAR Labs) STA80 tube amplifier over at Fred's place (April 2010). The tube compliment was 12AT7, 12BH7 (I think) and JJ KT88 Blue Glass tubes. About 55-65W and very nice sound. Apr 27, 2010
NCDIYMeet042010b~0.jpg
NCDIYMeet042010b~0.jpgNorthern California DIY Audio meet Roseville, CA 04/24/20104892 viewsNice meeting with Sigfried Linkwitz guest speakerApr 26, 2010
NCDIYMeet042010a.jpg
NCDIYMeet042010a.jpgNorthern California DIY Audio meet Roseville, CA 04/24/20105352 viewsNice meeting with Sigfried Linkwitz guest speakerApr 26, 2010
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