The X-Altra MC/MM RIAA Phono EQ article Part 1 has been published in the February issue of audioXpress magazine (Part 2 will follow in March). Here is a link to the February issue overview and towards the bottom, a quick…
Are you are looking for an experienced solid state audio designer? I am UK based but can undertake design projects on a contract basis for customers anywhere in the world. I specialize in power amplifiers, full feature pre-amplifiers (including low…
The Hifisonix kx-Amplifier is a 28 Watt class A DIY Current Feedback (CFA) power amplifier featuring low distortion, wide bandwidth and fast rise/fall times. It can be operated either in pure class A mode, or in class AAB mode with…
This class A headphone amplifier from 2014 is based on the design I used in my ‘Symphony’ preamp. It will drive a pair of 32 Ohm headphones to 6V pk-pk and remain in class A with < 330 parts per…
You may be in for a surprise: actually not that quiet! The reason of course is that the cartridge inductance and resistance dominate the noise in any decent phono amp. To get the best in terms of noise performance, you…
Here is a quick look at some of the problems that can occur when the VAS (aka TIS) in an audio amplifier is driven into saturation without considering the effects of base charge storage – a phenomena all bipolar transistor…
