#Marshall avt 50h pre amp tube series#
The label 12AX7 is a series of designators that describe what the tube is capable of and how it is to be used. 12AX7 Technical Information 12AX7 Specification And Max Ratings
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They span a wide range of voltage gain, ruggedness, microphonics, stability and even lifespan.īut the 12AX7 is the most commonly used tube of them all with over 2 million being produced annually. The 12AX7 is a part of a large family of twin triode vacuum tubes each with their own characteristics. This heater element stimulates electrons inside the tube and is seen by a faint orange like glow. Normally in the milli-volt range.Įach triode or amplifier inside the tube have 3 pins each that control the amplifier and a shared heater element. This is especially handy in instrument amplifiers as the signal from instruments is very low. It can take a small input signal and amplify it a great deal. The 12AX7 is a small signal high gain amplifier.
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The 12AX7 is a 9 pin dual triode, meaning it has 2 sides or amplifiers in one glass envelope or tube. It’s time we give the 12AX7 some well deserved recognition! Yet there is little to no mention of it even though it is one of the cornerstones of guitar sounds!Įven today amplifier manufacturers use the 12AX7 because it continues to be the sound in a players head. These little tubes were the driving force of the rock and roll sound from pretty well the beginning. These are iconic amplifiers for sure, but what about the mighty tube that made it all happen? That’s right, the 12AX7 has been used by amplifier manufacturers since the early 1950s! When you think of some of the amplifiers that powered the music scene of yesterday, you probably think of brands like Marshall or Fender.