The Baxandall 12AT7 tube tuner equipped with LG232 tone board, tube high and low sound controller, with volume adjustment
The characteristic of this circuit is that the control range is very wide, and when both potentiometers are placed in the middle position, a flat response curve can be obtained. During control, the shape of the treble frequency response curve is almost unchanged, but it is translated along the frequency axis. Although the bass frequency response curve is not constant, its change is smaller than that of most continuously adjustable circuits.
Baxandall-type tone control circuit is a nice tone circuit, which is also widely used in professional stage audio equipment today.
Due to its unique working mode, the tube device has the following advantages as a tone circuit compared to discrete components and op amp tones: high input impedance, large dynamic range, small thermal noise, good transient response, low distortion, good air sense, circuit Simplicity and many other advantages. Double-sided epoxy board, metal film resistor, Deweima / US film capacitor, 500K domestic ALPS potentiometer, Dutch 33μ450V filter and decoupling, Deweima capacitor coupling, Memoroli cathode electrolysis, etc. (different batch, The components used may be different, the components used are subject to actual assembly), high-frequency ceramic tube seat.
The machine adopts the power transformer rectifier filter independently designed by the headquarters to supply power. The high-voltage and low-voltage lines are equipped with choke coils to effectively remove power supply ripples and provide a more pure DC power supply for the tone board. Iron casing, the size of the whole machine is about: length 210 depth 188 height 81mm, 4 aluminum alloy legs are assembled, the appearance is very beautiful. Weighs about 4.3KG.
Can also be customized according to requirements!
The domestic ALPS assembly of the volume potentiometer of the finished machine.
2 × 24-step step volume potentiometer assembly.
