The plasma is produced by magneto-acoustic techniques in a glass tube situated in a constant magnetic field. The plasma flows out continuously along the axis into the measuring chamber at whose centre the magnetic field varies from 700 to 2500 Oe. A hydrogen plasma was studied at pressures of (5 to 1) × 10−3 Torr. The active high-frequency power put into the discharge was 4 kW. The temperature of the electrons varied from 4 to 10 eV, and the electron concentration at the centre of the chamber was 1 × 1010 to 4 × 1012 cm−3. The density of the plasma and the temperature of the electrons were determined mainly by electric probes. Further, the density and temperature of the electrons were checked by a microwave technique (for which the Fabry-Perot interferometer was used) as well as by optical methods.In the range from 10 to 200 kHz, intensive (∼1 V) electric noise with first-harmonic frequencies of several tens of kHz was discovered and investigated by means of dual electric and capacitative and double capacitative probes. The relationship between this noise and the plasma parameters was studied, and discussed from the point of view of the "universal" plasma instability.