My most useful links
G4DDK's preamp and general microwave pages
G3PHO's excellent portal to everything microwave!!
G4BAO's microwave site
CT1DMK microwave and radio astronomy pages
DL4MEA VHF/UHF and EME pages - lots of useful and interesting stuff!
David Kirby's site - A very useful source of power tube data sheets
DF6NA site with Russian tube and many TWT data sheets
SM5BSZ - the Linrad site
North Texas Microwave Society (NTMS) microwave pages
HB9BBD pages - preamps, dishes and links to hydraulics primers!
LZ2US Amplifier pages - rugged tetrode VHF and UHF PA's!
G4FRE/WW2R radio pages
Pages of the West Chester ARA,OH - based at the old Voice of America site