It is a small low-noise high-u 9 feet flat tube core columns in the audio amplification circuit for voltage amplification with the general drive for thepush-pull amplifier inverting. Shuguang 12AX7 into 12AX7, 12AX7B and12AX7M three categories. 12AX7B is rigorous hum, noise and the microphone effect of the test, the tube can be used to enlarge the heads of high-gain amplifier. 12AX7 and ECC83 functions and electrical parameters are identical.

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