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Since 1936, the detector radio of the type "DH-2" has been manufactured by the Moscow plant of Himradio. Structurally, the radio DH-2 is made in a wooden, painted box. The electrical circuit is mounted on the top panel on the inside of the drawer. Fine tuning for a wave of a broadcasting station is carried out by a variable capacitor, and coarse by switching the turns of the oscillating circuit coil. There is a switch connection with the antenna. External diode, type "DS". Headphones high impedance or piezoelectric.