The mod 102 is a great place to start for those interested in building their own tube amp it is based on a classic american tube circuit design combined with a british style class a output tube section. The wave is a stand alone tube driven analog spring reverb that can be used in front of your guitar amp or as a line level analog reverb effect for the recording studio read more mod 101 guitar amp kit. The phase inverter preamp tube is the third from left right a 12ax7 preamp tube aka ecc83 left typically has a gain rating of 100 and yields more distortion while a 12at7 ecc81 has a cleaner gain rating of 70 the first preamp tube aka valve in an amps circuit is used in its first gain stages of an amp. Because the earliest tube guitar amps from the 1950s werent intended to overdrive though it wouldnt be long before rock n roll pioneers harnessed the glorious sound the negativefeedback circuit was implemented as a way to reduce distortion. Property of the amplifiers maker unless otherwise verified warning tube amplifiers contain potentially lethal voltages do not attempt to perform work on an amplifier unless qualified to do so and experienced in high voltage safety procedures this information is intended for experienced technicians and is presented as is and with no guarantees
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