
Top design channel (V7, V10) passes only high frequencies defined by the small capacitance of the capacitor C12. In the collector circuit of the transistor V10 series two bulb from a pocket lantern, painted yellow.
The second channel mid — frequency. The capacitors COJ C13 determine the bandwidth dividing filter it. Lamps NZ, H4 are green in color.
The third low-frequency channel. In the filter main role is played by the capacitors C11 and C14. Lamp H5, h6 painted red.

The prefix is powered from any low-power step-down transformer for the 6.3 V, 1 A Rectifier is assembled in the bridge circuit four diodes, either for КЦ402 with any alphabetic index. Termination transistors V10— V12 is designed for a current of 300 mA, for example, П605, П608, П609. The remaining transistors — low-power, low-frequency, germanium, for example, МП42—МП39. Diodes — Д302, DZOZ, Д242А, КД202А or КД208А.