High-quality microphone preamplifier equipped with a vacuum tube, allowing for output level adjustment. The vacuum tube has been replaced with a new one from electro-harmonix, and some capacitors have also been replaced. I think it has significantly less noise than most used ones on the market. Adapter included. The original Chinese-made vacuum tube is also included. - Model Name: Studio V3 - Function: Vacuum tube preamplifier - Output Level Adjustment: Output level adjustment knob - Meter: Output meter - Internal Structure: Vacuum tube equipped