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1. http://www.vacuumtubes.com/6dj8.html
2.http://www.upscaleaudio.com/view_category.asp?cat=42
3.http://mysite.verizon.net/tubetronic/6dj8.htm
4.http://www.house-of-tubes.com/catal….asp?SKU=175438
5.http://www.pentalaboratories.com/Find.aspx?
6.http://www.mullardtubes.com/
7.http://www.canuckaudiomart.com/deta…old_aero_kt99a/
8.http://www.audiotubes.com/12at7.htm
9. http://www.drtube.nl/tubeshop.htm#NOS
10. http://www.house-of-tubes.com/catal….asp?SKU=117700
11.http://www.digitex.it/listini_en.html
12.http://www.tejastubes.com/
13.http://www.savantaudio.com/savant6.html#Tubes
14.http://www.tubedepot.com/index.html
15.http://www.cs.helsinki.fi/u/oheinone/valves/
16.http://www.vacuumtube.com/guitar.htm
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