RCA - R-10 Tubes Manual

http://www.nmr.mgh.harvard.edu/~reese/RC10/

leave it up to a bunch of NMR nuts to have tube data...Ironically, tube stuff is like the antithesis of NMR in terms of technology.

Electron tube database, 1958--1961

http://www.wps.com/archives/tube-datasheets/index.html

tube amplifier schematics

http://www.drtube.com/audioamp.htm#Marantz

Wartime tube substitution guide from GE

http://www.theoldradiofixerupperguy.com/pdf/getubesub.pdf - in pdf.

A list of common radio tubes (1920's to '60s)

http://personalpages.tds.net/~pdieten/tubes.pdf - in pdf.

Tube numbering systems and more...

http://www.electronicsgenius.com/Tech_Info.../tube_info.html

Nextube has Russian tube data and a list of US equivalents.

http://www.next-power.net/next-tube/datasheets.php3

Svetlana US is GONE but check the Wayback Machine

Tube list :

http://web.archive.org/web/20031211160903/...tube_right.html

Tech notes :

http://web.archive.org/web/20010815123842/...lletins/TB.html

JJ Electronic

http://www.jj-electronic.sk/

Jim McShane is THE expert on Harman Kardon Citation tube amplifiers

http://pages.prodigy.net/jimmcshane/index.htm

Dynaco

http://www.geocities.com/vintageaudio/

http://home.indy.net/~gregdunn/dynaco/

Eico Audio Components

http://users.erols.com/fiddler.interport/EICO.HTM

http://www.nostalgickitscentral.com/

From Japan :

DIY Valve Amplifier Gallery

http://www2u.biglobe.ne.jp/~tossie/contents-E.010106.html

Schemetics and vintage manuals

http://www.miduho.com/jp/st/amp-kairo/amp-kairo-date.html

The Ken Gilbert Tube-o-Rama page

http://ken-gilbert.com/technical_articles.htm

A must.

Good site on tube theory with excellent colour pics

http://www.tpub.com/content/neets/14178/

Grounding and Shielding Primer for Tube Circuits

http://www.sonic.net/~ktstrain/Groundtutor.htm

Electronic Vacuum Tube Reference Manual & Specifications
from the RCA Receiving Tube Manual.

http://www.kbapps.com/tubemanual.html

Anode Loading Chart

Excel calculation

http://www.ict-net.net/load.xls

Retail Valve Pages

Tube World

Vintage Tube Services

Vacuum Tubes Inc

Triode Electronics Inc

Jim McShane Page

Sophia Electric

Tubeman

Upscale Audio