Tube Amp Doctor 12AX7 Premium Selected Preamp Tube
9 pin miniature preamp tube (Amplification Factor =100). This is the ubiquitous Chinese 12AX7 with premium selection. The gain is high and the German Tube Amp Doctor must be filtering out the noisiest ones. Premium selected by Tube Amp Doctor, this is a quiet Chinese 12AX7 with high gain that will bring a dull sounding amp back to life.