Amp books
http://ampbooks.com/home/tutorials/pentode-tutorial-1/
Multiple discussions of pentode preamps -- guitar orientation.
http://www.pmillett.com/pentode_phono_preamp.htm
Nice article about a custom pentode design.
Very nice pentode design using the D3A (7721?)
http://www.audiodesignguide.com/Phono/pre-phono4.html
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