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Author: bonsai
Restoring a 57 Year old Receiver: The Pioneer SX-1000TA from 1966
I usually write about new designs, technical aspects of audio etc but on one previous occasion waxed lyrical about the JBL SA600, a vintage stereo amplifier from 1966 designed by Bart Locanthi, which has turned out to be one of the most popular pages on hifisonix.com – it regularly tops the monthly hits table. I…
My Beautiful Michell Gyro SE
I bought my Gyro SE (SE for ‘Spider Edition) in 2016, having read about Michell turntables on and off for more than 20 years. While working in Taiwan between 2011 and 2015, I visited a local Audio shop in Tianmu, Taipei where a full Gyrodec was on display. It was a huge piece of machinery…
The ax-Amplifier: A Very High-Performance 60W RMS Class A Amplifier featuring AFEC
Parts 1 and 2 of the ax-Amplifier were published in the April and May 2024 issues of US based audioXpress magazine. Part 1 – The ax-Amplifier Part 2 – The ax-Amplifier Click on the link to get the supplementary data (BOM etc) from audioXpress Click this link to order 2 off ax- Amplifier PCB’s https://hifisonix.com/shop/2-off-ax-amplifier-module-pcb/…
Imroved Soft Start + DC Blocker aka iSSDCB
The original Soft Start + DC Blocker published on this website a few years ago required quite complex wiring encompassing both the mains supply to the transformer and wiring from the rectified and DC-smoothed secondary. Additionally, the mains power switch had to be rated for the full primary AC load current which placed severe limitations…
Hifisonix X-Altra Mini II Line Preamplifier with Remote Control (Deprecated)
The X-Altra Mini II has been discontinued as a complete project. The individual PCBs are still available over in the shop however and are great line stages and power supplies. The X-Altra Mini II is a superb preamplifier and it sits at the heart of my system, but it was complex with lots of inter-module…
Hifisonix kx2 Class A Current Feedback Amplifier
The 15W RMS (28W peak class A) kx2-Amplifier offers outstanding noise and distortion performance and is specifically designed for driving high efficiency speakers in average to large listening spaces but also performs well driving more normal efficiency speakers in restricted listening spaces. Please note the kx2-Amplifier PCBs are supplied by Jim’s Audio. You can buy…
Hifisonix X-Altra MC/MM RIAA Phono EQ Preamp
The X-Altra MC/MM phono preamp, whether bought as a completed unit or DIY built, delivers the ultimate performance with respect to noise, overload, and RIAA conformance, placing it among the very best available anywhere at any price. In 2021, the design was featured in audioXpress, a leading audio industry publication based in the US. Part…
Hifisonix nx-Amplifier: A High Performance 100 W Class AB Current Feedback Amplifier
Originally published in December 2012. This power amp design is based on the sx-Amplifier topology, but with the TIS and output stage re-configured for class AB operation, enabling it to deliver 100 W into 8 Ohms. I have kept the design very simple, retaining the CFA topology, providing a very wide -3 dB bandwidth of…
Hifisonix sx-Amplifier: A 15 W Class A Current Feedback Amplifier
Originally published in August 2012. Update January 2018: For the sx-Amplifier, you can buy a complete set of very high quality Double Sided THP Gold Flashed PCB’s from Jim’s Audio here: sx-Amplifier DS THP PCB Set About 150 sx-Amplifiers have been built world-wide. As you can read about in the PDF below, my class A…
Hifisonix High Performance Balanced Line Stage
Click here to buy a stereo PCB for this line stage over in the Shop. Click here for the schematic Click here for the BOM Click here for some measurements of the Balanced Line Stage This compact OPA1641 and OPA1642 board is the perfect building block around which to build a high-performance line stage. Here…