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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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IMG_3492.jpgTesting of active crossover3726 viewsThe active crossover is using Rod Elliot's P09 design and is 24db/octave Linkwitz-Riley crossed at 3500Hz. Op amps are cheap TL072 and the sound is still great. Transients are not lost whatsoever.
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IMG_3497.jpgQuad-channel LM3875 Gainclone3661 viewsCrammed 4 LM3875 DIY Gainclone amps into this little box using 2-tiered setup.
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IMG_3498.jpgFinal active crossover + gainclone setup3167 viewsBurning the 4-channel DIY Gainclone and active crossover. I think this is the greatest sound quality improvement, especially for $50 active crossover. There is still hum from the new pair which I need to troubleshoot.
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IMG_1479.JPGChassis and plastic3016 viewsBending the plastic was a pain, i did it with a hair dryer and a LOT of patience... i don't recommend you to try to do it, it takes a lot of effort and time.
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IMG_1480.JPGMaking the chassis, bottom view2995 viewsHere are the two pieces that make the chassis put together. Bottom view.
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IMG_1412.JPGAluminium and mate3064 viewsThe aluminum sheets used for the dissipater and a "Mate".
"Mate" is the Argentinian equivalent of "Tea" for a British.
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IMG_1419.JPGDissipator3238 viewsThe dissipater is homemade.
Note the shape and size of the inter-connecting metal between sheets... i don know if the shape was necessary but... it was a aesthetic choice.
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IMG_1420.JPGDIY Heat Sink3224 viewsAfter polishing... beautiful, no?
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IMG_1422.JPGDIY Heatsink3430 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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IMG_1423.JPGMaking the chassis3120 viewsBefore bending the sheet metal.
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00118.jpgLM3886's and heatsink3361 viewsThe thin cables are for the grounds that (i suppose) don't carry high current. The chips have silicone grease for better thermal conduction.
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00119.jpgFinished, inside view3730 viewsEI transformer, rectifier, star ground (just above the left cap of the rectifier), LM3886...
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00126.jpgFinished, rear view (Ipod not included)3316 viewsCheck out the DIY heatsink.
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00139.jpgFinished, front view3220 viewsNow you know why it is named Blackbox, right?
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00002.jpgCustom PCB3651 viewsFront of the LM3886 and power cables, the rest of the cables needed to make a star ground where much more thinner (single wire).
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00003.jpgCustom PCB3946 viewsI know... its not a printed circuit board... because its not printed... but i made it with love.
You can see the rear of the LM3886 and the power cables.
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00094.jpgRectifier capacitors3937 viewsWired with the resistors, smaller caps and a cooper cable extension to make easier the soldering and assembly.
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00095.jpgMaking the chassis, rear view3866 viewsPutting together the plastic and the metal, rear view.
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00097.jpgEI Trans and rectifier4216 viewsStill in the building process, the EI transformer (24VCT @ 6amps) and the rectifiers (MUR860 diodes) and two 10000uF caps.
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FinishedInide.JPGOP Amp Preamp - inside the case5977 viewsOn the test bench for a short run-in period. The lids off waiting for smoke. No smoke but on the first start there was a minor fault. I have been listening to the preamp for two hours now and found it adds nothing to the sound (as a preamp should) and extends control with volume and balance adjustment. The yellow caps are 0.47 uF polypropylene metal film. Full details are available for this project at: DIY Op Amp based Preamplifier Project.
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