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An article about howto get your high-voltage capacitors for FREE! : Photo Flash capacitors

An article about the RIAA curves exact look with mathematical formulas and everything! : RIAA curve

The RIAA-curve may be modified in accordance to better match the "real" record cutting machines: RIAA mod
(The article probably from the book "The Tube Pre-amp Cook Book" by Allen Wright.) 

An article about different transistors, marking schemes etc.: Transistor info

An article about capacitor marking, types etc.: Capacitor info

A description of the different interfaces between: CD - DAC

An article about how to use the Belden 89259 as a loudspeaker cable, interesting project which I have not yet tried. Warning for some "quasi scientific" nonsense, as that the "skin effect" would have any significance for frequencies in the Audio range: Belden as a loudspeaker cable