Welcome to my place!

Audio Resource Jan Didden

It's great to have you here!

This place is where I talk about my personal projects, interests and whatnot. Not necessarily related to audio, although it often is. Under the Musings button you'll find things related to perception and conciousness which of course are very much applicable to audio!

My library lists lots of (historic) audio papers and studies that I personally find important to understand many different issues in audio.

I also have collected the interviews I've done with audio luminaries. Take some time to read and digest them - there are very interesting and worthwhile gems in each of them! My projects however is audio stuff - things I designed, wrote articles about, and my personal system. Comments and remarks are always welcome!

Last but surely not least, let me mention my publication Linear Audio. Published twice per year, over 200 pages of technical audio related articles from international authors. Article abstracts and author bio's can be read at the website, and some articles are available for free online.

So, take a look around, explore the various areas and let me know what you think!

Extending tube life with a HV delay

Tube life can be extended if you delay the application of high voltage until after the heaters have warmed up and current can flow. This little module does just that: depending on the setting of a jumper, it delays the high-voltage for 40 or 60 seconds after the amplifier is switched on. It can easily be retrofitted to any amplifier because it is wired in between ground and the power transformer center tap (or between ground and the bridge in a full-wave rectifier). It needs a floating heater winding or equivalent to power it. The small PCB and the control chip that takes care of the delay can be had from Circuit Cellar's online store. You can read the full article here, courtesy AudioXpress.

The PCB and controller chip are no longer available on-line but you can have your own PCBs manufactured or organise a Group Buy is you wish. The Gerber files are here and should be useable by any reputed board house. The Hex file for the controller firmware can be downloaded here.


Another year passed, another year older, another year wiser (...

Spring 2015 and I'm  again preparing for some trips:...

It's that time of year again: Oct always sees me in the US to meet lost of old friends, authors and make new ones! And it's audio that binds us. First, on 6 October, will be Burning Amp in...