Sjöström Audio

https://www.markhennessy.co.uk/audio.htm
Mark's website has a number of Gainclone-related projects. Check out the LM4780 micro-amp and a new 4 channel LM4780 amplifier which also supports bridged and bi-amp operation. There are details of my original prototype LM3875 monoblocks and articles...
http://www.quadesl.com
Sheldon Stokes has tube amplifers, DAC's and electrostatic speakers (Quad ESL) as major interest. He has designed a couple of interesting projects, among others a tube equipped DAC. Nowadays he seems only to work with Quad ESL speakers.
http://www.tephrowelt.de/
This site is dedicated the cactus genus Tephrocactus, but also other species. <em>Very</em> narrow subject but if you this special kind of cactus, you can get some information here.
http://www.ezonaudio.se
Urban Erixon from north of the pole cirle in Sweden is a very skilled designer of audio. Power amplifers and DAC's are his thing. He is also very good in mechanics. Check out his enclosures.
http://sjostromaudio.com/pages/index.php/hifi-projects/122-qrv01-headphone-amp
Click on the picture to get a larger view. I designed this amplifier 1986 and I felt like publishing it now. The excellent MOSFETs from Supertex Inc are hard to get these days (not impossible) so therefore the amp needed to be redesigned a little bit...
https://lokforaren.wordpress.com
Optimisten ser ljuset i tunneln. Pessimisten ser mörkret. Realisten ser tåget. Lokföraren ser tre idioter på spåret. A Swedish blog about driving trains.
http://sjostromaudio.com/pages/index.php/hifi-projects/129-qrv08-headphone-amp
Click on the picture to see a larger view of the pcb. The performance is outrageous in headphone amp terms. See the technical data! Interesting features: High speed, low distortion current feedback design. All discrete design of the amp itself...
https://sklep.toroidy.pl
All sorts of toroidal transformers and inductors. They have also transformers for tube amplifiers.
http://www.jv-extensions.com
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http://www.awdiy.com/
miniVreg, precision voltage regulator and other DIY stuff such as clock oscillators. A webshop is connected.
http://www.vadlyd.dk/English/RIAA_and_78_RPM_preamp.html
Danish firm which makes RIAA correction amps for 78 rpm records. The amp has variable RIAA correction curve.
http://www.vistaprint.com
A nice service if you want nice looking but cheap business cards, of course nothing is for free but it's cheap.
http://www.cirrus.com
Manufacturer of extremely high class ADC's and DAC's. Crystal (Cirrus Logic) ar world leader but AKM is breathing in their neck...