Valve (tube) amplifier testing and biasing

John’s Hifi shop is planning to have a workshop one Saturday soon to bring your valve amp for a checkup and bias setting. There will be details soon, but get your equipment redy, this is a great opportunity and also good fun. John of course is hoping to sell some of his massive stock of valves.

Watch this space for the date.

NEW PRODUCTS! Melbourne Audio Club meeting 15 February

The meeting also was the first time I saw Hugh Dean’s newest AKSA amp, a 70 Watt amp designed with some (intentional) 2nd harmonic distortion, an interesting new design using only 5 transistors. Having heard several of his other amps I can believe this is going to be something special.

The Jaycar DAC was also a new product with potential. It handles all formats (except SACD), and up to 24bit 192kHz conversion. Great for audio stored on your computer, USB input and Toslink, headphone and RCA out. $149 retail. Used with Mark’s 300b amp and Fostex horn loaded speakers.

Our DIY guru, Mark Houston will present an evening that goes a step further than the Stephen Myles/Glen Baddeley evening a few months ago. Mark will be looking at computer based audio using a reasonable cost ($149) DAC from Jaycar. This DAC, unlike others, is a high performance DSP (Digital Signal Processor) which does all the conversions in software. It works asynchronously with the computer and uses a number of Xtals for low jitter and high performance. Mark will play only high resolution files including 24 bit, 192k.

Equipment will include a 300B amp. (the Silver Dragon) and Mark’s Fostex back horn loaded speakers. The preamp is a Pass BoZ, special edition.

Here is the future of audio. All indications are that CD’s are now past their use-by date and with this technology, soon blu-ray will be the only portable storage medium for high-def. audio.”