guitar speaker cabinet all things music
The amplifier works in two stages. The first one is preamplifier stage which amplifies the voltage of the signal from the guitar. The preamplifier stage allows electronic effects like distortion, reverb, and chorus and controls like graphic Construction: Guitar amps may either use tubes or transistors. Amps with transistors are cheaper and are likely to last longer. Amps with tubes produce better sound. However, they tend to burn out and need to be replaced.
From: http://www.walldenmusic.com/guitar-speaker-cabinet/

oktava mc012 recordinghacks com
and high-end response is smoothed. Marik Marik Marik's mod for the MK-012 includes component upgrades and converts the original circuit from a “FET and BJT transistor” design to an “all-FET” design, providing a more natural and homogenous sound. The mic consists of a head amplifier and a series of detachable capsules. Currently, a variety of compatible small-, medium-, and large-diaphragm capsules are available from Oktava and other manufacturers.
From: http://recordinghacks.com/microphones/Oktava/MC012

microphone transistors preamplifiers rangkaianelektronika com
Below exist two choices for preamplifiers of microphone that use transistor, in asymmetrical of input connection. The first choice, are with diode zener, the other
From: http://www.rangkaian-elektronika.com/microphone-transistors-preamplifiers.htm

meta microphone preamplifiers
META - Microphone Preamplifiers Matching Transistors for Valley People MicPre -- good information on how to match transistors for a low-noise frontend and
From: http://www.prodigy-pro.com/diy/index.php?topic=16909

microphone preamplifiers
Microphone Preamplifiers Aphex Model 188 Eight-Channel Microphone Preamplifier by Strother Bullins, 08.16.2010 The Toft 'A' Range Mic Pre EQ 12.05.2008 An all-discrete transistor design
From: http://www.proaudioreview.com/section/Microphone-Preamplifiers

milbert amplifiers most musical amplifiers
tubes and transistors appear to behave quite differently from a sound viewpoint. DISTORTION CHARACTERISTICS OF PREAMPLIFIERS. Three commercially available microphone preamplifiers of
From: http://milbert.com/articles/tubes_vs_transistors