Barnes & Noble (and their Book Stop affiliates) has a reprint of the Bureau of Naval Personnel Training Manual in Basic Electronics, which has some info on tube and tranistor circuits, mainly w/ an eye towards radio, but some stuff quite relevant to audio aplications. The reprint is only $15, so this is a good, cheap starting point reference, and it doesn't look too deep for the newbie. Even if the Radiotron Handbook is an inevitability, this would probably be a good precursor to many.
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