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Data:

Valve Data - Sylvania Technical Manual 1951
http://www.pmillett.com/sylvania_tube_manuals_online.htm

RCA, R-10 Tube Data Manual
http://www.nmr.mgh.harvard.edu/~reese/RC10/

Coil Winding Wire Data (AVRS)

Excellent valve data site
http://www.tubedata.org/

All about circuits (semiconductors)
https://www.allaboutcircuits.com/

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Clubs & Societies:

AWA/OTB - Antique Wireless Association
http://www.antiquewireless.org

Antique Radio Club
http://www.antiqueradio.com/clublist.html

BVWS - British Vintage Wireless Society
https://www.bvws.org.uk

CVRS - Canadian Vintage Radio Society
https://www.canadianvintageradio.com

HRSA - Historical Radio Society of Australia
https://hrsa.org.au/

MAARC -Mid Atlantic Antique Radio Club
http://www.maarc.org

Michigan Antique Radio Club (SCARS)
http://www.michiganantiqueradio.org/index.shtml

Nederlands Historical Radio Society
http://www.nvhr.nl

NORSK – Norwegian Historical Radio Society
http://www.nrhf.no

NZVRS – New Zealand Vintage Radio Society (Inc)
https://www.nzvrs.com

Edizoni
http://www.antiqueradio.it