Sources For Further Information
Perhaps the best discussion of cathode bias, in terms of clarity and simplicity, is to be found in one of the many editions of The RCA Receiving Tube Manual, in the applications section. This manual was published in many forms and editions for over 40 years, but has long since been out of print. Edition RC-17, released around 1971 is likely to be the most available. Information in this article is based on that edition.
Excellent discussions of cathode bias may also be found in Basic Electronics, by Bernard Grob, published in no fewer than eight editions over the years (with continued revisions after his death) by McGraw Hill. U.S. Air Force Manuals 52-8 and 101-8 also cover this subject, although they have long been out of print. Copies may still be available from the U.S. Government Printing Office. The problem is that the technology is getting old fast, and nobody writes much about it any more.[edit: The technology maybe old, but many guitar players and HiFi audiophiles will never give them up. To that end, here are some sites for more tube amp info.
http://www.aikenamps.com/TechInfo_2.htm (Great technical info)
http://www.tubebooks.org/technical_books_online.htm (Downloadable copies of out of print text books in the public domain)]
Read more about this topic: Cathode Bias
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