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6BQ5-Push-Pull-Tube-Amp.jpg6BQ5 / EL84 Push-Pull (PP) Tube Amp4217 viewsTube amplifier built on the basis of the Schematic from 6BQ5 / EL84 Push-Pull (PP) Tube Amp.
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Single-Ended-833-Tube-Amplifier-Monoblock.jpgSingle-Ended 833 Monoblock Tube Amplifier4210 viewsI have built a monoblock 833 SET tube amplifier with zero feedback and a fixed bias. The total power output 125W! Here you can find more photographs: http://img200.imageshack.us/gal.php?g=img1663t.jpg
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SV101647.JPGOPA2134 Inside the Chip amp preamp II4155 viewsYou can see how compact the boards are. The yellow caps are MPX 0.47uF and 220uF low ESR electrolytics store power from the voltage divider network (virtual ground). Computer stand-off keep the brds. off the case and are fitted with rubber grommets to control cct. resonance and vibration. More details are available at the DIY OPA2134PA Preamplifier Project page.
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SV101485.JPGFinished Subwoofer Processor Kit4137 viewsThis analogue OP amp based sub-woofer processor provides a lot of flexibility when it comes to low pass filter adjustment, parametric equalization, sub-sonic filtration, gain and input selection in a slim neat box. But when it comes to set-up and balance with your favorite speakers, there is a lot of work to be done. The kit is from Jaycar Australia.
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TubeLab-Simple-SE-6L6GC-Tube-Amp.jpgTubeLab Simple SE 6L6GC Tube Amp4133 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.
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Bottlehead-Seduction-Phono-Preamp-Top.jpgFinished Bottlehead Seduction Tube Phono Preamp4116 viewsA finished view of the Bottlehead Seduction Tube Phono Preamp kit.
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EL84_PP_6E6P_driver_1.jpgThe Simple EL84 PP version 2 (on steroids) 4100 viewsThis is the second version of my first DIY audio project. I changed the Driver tube to 6E6P strapped as triode with CCS load (IXYS 10m45s - 15mA).
Current sinks LM317 at EL84 cathodes it not grounded but connected to a -24V negative power supply. That gives more gain, less distortion and gives also much more headroom for the output stage.
The coupling caps are 0.22μF PIO JENSEN. I' ll try the russian teflons in the next few days.
This tube amplifier simply rocks.
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PhonoInside.JPGPhono Preamp Ki.4093 viewsThe cct. brd was assemble and the ABS plastic case drilled ready for assemble. ABS is a very hard plastic to drill. Before assembly the lid, base and sides were lined with heavy tar and foil stick-on shielding. This helps with case dampening also. All gold RCA connections were kept to the rear (see other photos). The chips are the LM833s but the Burr-Brown OPA2134 high performance chip can be directly substituted. The on-board +/- 12V regulated PS is shielded from the rest of the sensitive cct. Additional snubbing was added to the line caps to remove PS noise and chip RF decoupling. Though three different compensation can be selected from the cct. brd by moving two jumpers the lid must be removed to do this. A double pole rotating three position switch could be added to provide this facility externally. The cct. includes a gain control which is accessed from the front and allows easy and silent level adjustment. The sound is natural with no hiss or hum. Easy to build.
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Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit4064 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.
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Audio-Innovations-700-Integrated-Tube-Amp.jpgAudio Innovations 700 Integrated Tube Amp4062 viewsAudio Innovations 700 Integrated amp. It is only 25W and really not impressive at all. Uses EL34 valves.
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KT88-Push-Pull-Tube-Amp-Front.jpgKT88 Push Pull Tube Amplifier (Top)4048 viewsTop view of the KT88 push-pull tube amplifier. The amplifier is based on Bruce's KT88 Push-Pull Tube Amp but uses new production KT88 Genalex Gold Lion tubes from Tube Depot. More information and photographs for this build are available in this KT88 Push-Pull Tube Amp message thread.
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TSpecialUnderChassis.JPGUnderside view of the 6T9 baking pan tube amp4031 viewsThe OPTs and printed cct. brd. fit snugly in the thin baking pan chassis making a compact little amp. Drilling such a thin chassis has its challenges and getting all the drilled points to line up with cct. brd. mounting holes can be frustrating. This amp is a poor performer under the CRO but produces an astounding stereo image. It plays small classic quartets, jazz groups and most voice and piano based music well. You need at least 90dB efficient speakers that can go deep for good listening. See the 6T9 Tube Amplifier Project page for more info.
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PP_EL84_driver_EL84.jpgSimple EL84 PP, my first tube audio DIY project4022 viewsThe well known simple EL84 PP schematic as my first attempt at Tube Audio projects.
Here in the first version I also used the EL84 triode strapped as a driver. For me It was like hearing music from heaven.
That wooden case is from a liquor store having which contained Vodka and Brandy inside.
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SV101939.JPGVintage Sony TAN-5550 and TAE-54504021 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.
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LePacific-MC-PrePre.jpgLe Pacific MC pre preamp4017 viewsHere is one of three Le Pacific MC pre preamp builds. All the construction is on veroboard (strip board). These builds have been tested with a two different cartridges with an output of 0.35mV and all work extremely well. The J-FETs are 2SK170 BL which are matched. The output capacitors are Russian mililtary PIO. The case colour is Sungold the same used on Paris. All phono preamp builds are battery powered.
Mark - retro-thermionic
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KT88-Push-Pull-Tube-Amp-Bottom.jpgKT88 Push Pull Tube Amplifier (Bottom)4016 viewsUnderside view of KT88 Tube Amplifier. The amplifier is based on Bruce's OD 225 but uses KT88 output tubes for more power. See this thread for more information and photographs.
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12AU7-Tube-Cathode-Follower-Preamp.JPG12AU7 Cathode Follower Tube Preamplifier4015 viewsThis is a DIY 12AU7 vacuum tube preamp. Rectifier is a 6X5GT, and voltage regulator is an 0D3 tube.
Here are more details about this DIY 12AU7 Tube preamplifier.
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IMG_1422.JPGDIY Heatsink4014 viewsNote the shape and size of the inter-connecting metal between sheets... i don know if the shape was necessary but... it was an aesthetic choice.
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K281FrontS.jpgOatley Electronics sub-mini tube/chip amp hybrid K2814010 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.
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Seas-exotic-fullrange-loudspeaker.jpgNew Seas Fullrange Speaker4002 viewsThe new 8" Seas fullrange unit. Not much info available other than it will be release Jan 2008. The magnet does not look all that large, so I suspect it will be a high Q driver.
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