For this UA-12AX7B tube,it can be directly upgraded or used by 12AX7/ECC83/7025.
The UA-12AX7B is a miniature high-mu twin triode.This tube is especially suited for using in resistance-coupled voltage amplifiers,phase inverters,multivibrators and numberous industrial control circuits where high voltage gain is desired.A centre tapped heater permits operation of the tube from a 6.3V or a 12.6V heater supply.
The UA-12AX7B is typically used as a class-A amplifier in the hifi,professional line and microphone preamps and is usually always found in the preamp sections of tube guitar amps including Fender,Marshall,Boogie and Soldano.
This tube is used a lot for that purpose and is an essential ingredient to the rock guitar sound,pretty much defining the sound of rock guitar from the 1950s to today.
The tube requires a noval nine-contact socket and may be mounted in any position.The design is with gold plating feet which can have better quality and stable contacts
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