100% Brand New and High Quality

 

It is a focus on "the rich musical charm" pocket preamplifier, circuit junction FET and a tube composed by a special direct coupling approach, because you want a rich musical taste, so the use of this outstanding performance of 2SK117-BL and 12AX7 combinations. In order to improve the resolving power of the sound, in order to obtain a more delicate sound so rich in detail, specifically to enable the first stage in a trickle field pipe work state (approximately 120uA), while the volume potentiometer 250K using high impedance type; and the output stage 12ax7 take a relatively large current (about 2mA) to establish vigorous of the sound. All of these are for one purpose: to obtain a low distortion and delicate and deep rich flavor of the good voice.

 

This is a low noise low distortion JFET-tube hybrid pre-amplifier PCB. The circuit features a low noise low input capacitance J-FET ( 2SK117) input, and followed by 12AX7 as second stage and output.

Output Distortion: 0.005% @ 1Vrms, 0.008% 2Vrms, out of the sound is high resolving power, wide sound field, the sound is very magnetic very resistant to listen, I am very satisfied! I personally think this is a low-power, high cost and can be miniaturized outstanding before the class.

 

Operating condition : +250VDC 10mA

 

PCB thickness : 1.6mm

 

Copper thickness : 2 ounce copper ( 70um !) plus gold plated surface for high current.

 

1 x Tube Preamp Bare PCB ( not contain other parts)