Zhiluo-Lao Shao Promotion: PRT-02A Electronic Tube Microphone Preamplifier Finished Board

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Please note: This is the front level of the electronic tube, which cannot be pushed directly into the box or directly into the headset.

AUDIO NOTE M7 is a famous and pleasant courage level;

PRT-02A refer to the amplifier circuit of the machine, so that new students can also get H cost-effective products at very little cost.

This version adopts compatible design and can adapt to different electron tubes through jump caps on PCB. It is compatible:

jump cap short circuit A1 = 6N2, 6N11, 6922 and other 6V power supply tube (6N1 current is too large, not suitable)

jump cap short circuit B1 = 6N4, 12AUT, 12AX7, 12AT7 and other 12V power supply electronic tube

PRT-02A is designed as an integrated board, with DC filament power supply, high voltage band voltage stabilization and electronic filtering, and direct streaking.

Voltage input requirements:

filament part:

AC6-12V no less than 1A (when the input exceeds 9VAC, please pay attention to the heat generation of the heat sink)

high voltage part: AC200-240V, no less than 10MA

We have matching small EI transformer

Size: 127X75X80 (including copper column and tube height)

Special note: In order to reduce the internal resistance of the high-voltage part of the power supply, the discharge resistor is not designed in this version, so the discharge of the high-voltage part is extremely slow after power failure. Do not touch the high-voltage part of the device.

(250VDC, just draw it after touching it, it is quite energetic )