• Low noise Small 9pin flat core columns tube, audio amplifier circuit for voltage amplification, typically used for inverting driver push-pull amplifier circuit
• can be used in the first stage amplifying of High-gain amplifier
• The function of the 12AX7 and ECC83 and electric parameters exactly the same.

热丝电压
UH………… 6.3(并) 12.6(串)  V
IH………… 0.30     0.15     A

A1类放大时极限值（每边）
阳极电压………………………… 330V
栅极负电压………………………… -50V 
栅极正电压………………………… 0V 
阳极耗散功率……………… 1.2V 
热丝阴极间电压（pk）………… ±180V 

静态参数
Ua………………………… 100  250 V
Ug…………………………   -1 -2 V
Ia………………………… 0.5 1.2  mA
Gm…………………………  1.25  1.6 mA/V
Rk………………………… 270  200  Ω
μ …………………………  100   100
Ri………………………… 80 62.5 kΩ