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| 590 files in 8 albums and 1 categories with 5 comments viewed 2,086,195 times |
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PreAmp.JPGOPA2134 based preamp with balance control.5509 viewsWith the case work complete it will not be long before this OP based preamp is singing along. The case is small about 115 X 85 and cast aluminum. Gain is 3 dB and a balance control has been included. Full details for this project are available at: DIY OPA2134 Preamplifier Project.
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DIY-2SK1058-Mosfet-Amp-Night.JPGDIY 2SK1058 Class A Mosfet Amp in the dark5279 viewsSergiy Makharchuk from Russia has put together a version of Mark's DIY Class A 2SK1058 Mosfet Amplifier. Here you can see it lit up in the dark.
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2SK1058-2SK1057-2SK1056-IRFP240-classA-Mosfet-Amplifier.png2SK1058 / 2SK1057 / 2SK1056 / IRFP240 Class A Mosfet Amplifier Schematic7816 viewsSchematic of Ivan's modified version of Mark's simple DIY 2SK1058 Mosfet Amplifier. This version uses a 12V / 20W light for the load resistor.
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12AX7-ECC83-Tube-Preamp.jpg12AX7 / ECC83 Tube Preamp2046 viewsHi, I have built preamp with double triode 12AX7 from your web site.
The sound of this preamp is very very nice, detailed and realistic.
Pipa (from Czech Republic )
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71-A-Tube-Amplifier-SE.jpgUX-171A Tube Amplifier203 viewsThis amplifier uses the UX-171-A tube (matched pairs) which are rare and produce only 1/2 W of output power. There are no resistors or capacitors in the audio circuit. A Hammond 124B nickel core inter-stage transformer couples to the power tube. Edcor 10W OPTs in the metal case. Bias is provided by 3 x 9V batteries and 230V by two step-down transformers wired in reverse. The rectifier tube is a very old "80". Power supply filtering is under the top plate (ply timber). The base houses the power transformers and is a 1940s wooden pot stand. The tube amplifier sounds excellent.
For more info, see the 171-A single-ended amplifier thread in the forum.
Mark Houston – retro-thermionicApr 22, 2013
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Juan-ZCA.jpgZCA by Juan225 viewsGood day
I would like to add some of my pictures about my ZCA build from your site and I must say that this amp sound very good.
Regards
JuanApr 08, 2013
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DIY-Two-Way-Speaker-VoXDeuX.jpg324 viewsUsing inexpensive components from the local electronics shop I constructed these small bookshelf two-way speakers. They comprise a 5” paper cone mid-woofer and dampened silk done tweeter. On the sides and back is wide internal vertical bracing and bitumanised heavy aluminum foil. This forms bass chambers within the box to control rear reflection. The passive crossover sits external to the speakers and is a Linkwitz-Riley 2nd order with a crossover point set at 3 kHz. The boxes and crossovers are bi-wired using Cat5 cable from the amp to driver. They sound excellent for an AU$350 build.
For more info, see the Simple and Cheap Two Way Speakers thread in the forum.
Mark Houston – retro-thermionicMar 24, 2013
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Oatley-Electronics-K272B-prototype.jpgOatley Electronics K272B prototype705 viewsSoon to be released Oatley Electronics K272B prototype. I recently made two CMoy style, OPA2134 based, HP amps but now prefer the better sounding, harmonically rich, K272B build. Two 9V batteries are used in parallel to prolong battery life and switching phone jacks, power switch and “on” LED ensures it is difficult to accidentally leave the amp on. The enclosure is impact resistant ABS which is heavy Al foil lined. Volume control is via your player and the “6418-B” will drive low impedance phones. Where the CMoy style, chip based, HP amps are clean, clear, bright and clinical, the “6418-B” has a much richer, more harmonically complex sound and a smoother all over delivery. Really it all gets down to taste. I would recommend building the K272B when released around early February 2013. I suggest you upgrade the Oatley passive parts and chip socket to better quality parts.
For more info, see the
Oatley K272B JAN6418 headphone amp and preamp thread in the forum.
Mark Houston – retro-thermionic
Feb 08, 2013
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