I don't normally add "courtesy links", but I was asked to add this link: http://www.datasheet4u.com. I know that I spend a lot of time searching for datasheets, and this particular link was just too good to refuse. I make an exception.
http://www.baltechno.se/ is A Swedish company, based in Gotherburg.
Baltechno have been repairing RC electronics for nearly 20 years. They have built up a very well equipped work shop and are authorized by, for example, Graupner/JR, Hitec, Thunder Tiger, K.O. Propo, and Kyosho. They repair RC equipment for the whole of Scandinavia and sometimes get repairs from countries like Germany, France, Greece. E-mail 
. I found them VERY helpful obtaining R/C mechanics.
http://www.colomor.demon.co.uk UK supplier of Electronic tubes and RF components. They will deliver abroad (and answer their e-mail).
http://www.xs4all.nl/~barendh/ is well worth a visit. They stock those "hard-to-get" RF chips, such as prescalers and synthesizers, etc. They were the answer to my prayers after searching the web for weeks.
http://www.kitsrus.com is another fantastic supplier of both components and kits. They are based in Hong Kong and have quite a wide variety of kits, including an on-line catalogue.
http://www.bardwells.co.uk/ is a fantastic component supplier in the UK for the RF constructor. On-Line cataligue too! They even have stocks of the TCM3105. I started using them over 30 years ago.
Antique Electronic Supply company has an on-line catalogue. They can supply almost all you can wish for in valves and valve orientated components. Prices are quite cheap too!
Maplin Electronic components is a good source for modern electronic components at reasonable prices. They do not have a catalogue on line but they will send you a catalogue, even on CD-Rom.
QuartSlab Marketing Ltd. supply custom ground crystals manufactured to your own specifications. Pricing and information on-line.
Please do not ask me for "courtesy links" because the answer is NO. I will only provide rare links that are related to my homepage subject material and only links that are in some way 'special'. If you want a link somewhere then I reccomend you visit UK Amateur Radio quick links or http://www.ham-links.org/ where you will find just about all the Ham radio links I want.
Anyway, here are the 'special' links:
Nick Desmith's homepage at Nick http://www.desmith.net/NMdS/Electronics/, featuring:
- 88% efficient SMPS - 250VDC @ 125mA from 12-15VDC input,
plus other projects :-)
http://www.xs4all.nl/~pa0fri
- Zelfbouw met vooral info over antennes, tuners, lineairs en mods.
- Homebrew especialy info about antennas, ATU's, linears and mods,
most schematics with english text
http://www.qsl.net/ve3bdb/
- For collectors, restorers and operators, past and present, of the
vintage World War Two 'tank' radio, the Wireless Set No. 19".
The 19 Set saw action in every theatre of WW2, as well as Korea.
http://www.qsl.net/wd4nka/
- exclusively simple tube/valve homebrew.
http://www.thermionic.org
- Andrew Burge's thermionic site.
The DXZone Award
- Selected "hot" hamradio sites. The best on the web,
including Harry's Homebrew Homepages.
ARPR Australia
- dedicated to the promotion of Amateur Radio,
both in Australia and around the globe.
RSGB Radio .. whachamacallem...?
... the ones that copied
Sveriges
Sändareamatörer.
A
searchable transistor database, courtesy of Jerry Russell.
Valve (tube) data,
courtesy of Trevor Gale.
G3YCCs QRP homepage
Everything for QRP.
http://www.intio.or.jp/jf10zl/
Loads of constructional projects. Fantastic!!
SM6LKM QRP corner See
'Optimist 80' DSB TX/RX.
FTP
site with loads of PCB software.