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EVATCO - Electronic Valve and Tube Company - a source of just about every valve you might need
Classic Radio Gallery - Premier antique radio site with lots of useful data
Tubes 201 - how vacuum tubes really work
TDSL Tubesearch - vacuum tube data
Lavasoft - remove that spyware you've picked up (without knowing it) with Ad-Aware freeware
Gibson Research - test your PC security. Click on "Shields Up", then "Hot Spots > Shields Up", then "Test my Shields" & "Probe my Ports".
Mailwasher - a mail filtering program. Get rid of that spam and infected mail before you download it from your ISP.
Other useful links
How Stuff Works - when your son or daughter asks (or you wonder yourself) "How does a jet engine work?" or similar
The Red Book - how much is your car worth?
Australian HF Radio Networks
Australian HF Touring Club Inc. - Australia's Premier Social HF Radio and Touring Club
Amateur Radio/technical data
AC6V Ham Radio and DX Reference Guide - a comprehensive source of just about everything relating to amateur radio
Collins Collectors Association - for aficionados of Collins equipment
WA3KEY Virtual Collins Radio Museum - and much more of the above, along with many pix, specs and other data
Collins Compendium on the Web - Ian McLean's site, with much good info on Collins gear
Manual Man - commercial copies of operating and service manuals
Rig Pix - heaps of pix of communications gear including scanners and some specs.
www.mods.dk - modifications for many radios
eHam.net - many reviews of amateur radio equipment and other information
VK Classifieds - radio comunictions gear for sale and wanted - premier Australian site
Peter Parker VK3YE's site - amateur radio site with information on the hobby and much more
RF Cafe - your engineering website
Australian Ham Radio Discussion Forum - Australia & New Zealand Amateur Radio discussion forum
MILSATCOM -- data on the U.S. military Fleet SATCOM series of satellites and others
Australian Radio Scanning sites