The GR150DK is a small voltage stabiliser fitted with a small bayonet base cap.
The voltage output is 150 Volts and the current is below 10 mA and thus this is suited to local stabilisation of the voltage feeding a reference oscillator.
The maker's name is not present but the logo is that of the German manufacturer Pressler.
The construction is of wire mesh with an inner and outer cylinder made of the mesh.
The thin glass tube envelope is 16 mm in diameter, and including the base cap is 71 mm tall.
Reference: 3002. Type GR150/DK was first introduced in 1949. See also 1949 adverts.
Updated April 09, 2016.