The CV3789 is a frame grid amplifier triode with a noise figure of 2.0 dB at 45 MHz and 8.0 dB at 400 MHz.
The commercial equivalent 5842 was specially designed for use at IF frequencies where with the absence of negative feedback the triode can operate with less noise. The circuit topology could be as a grounded grid amplifier.
The GEC brand label.
The working face of the anode each side of the cathode is small in relation to the overall area of metal employed. The maximum anode dissipation is 4.5 Watts.
Side view showing the strap joining the two sides of the anode. It can be seen that the working face of the anode comes very close to the control grid. The base pins are gold plated.
The thin glass tube envelope is 21 mm in diameter and, excluding the base pins, is 35 mm tall.
Reference: Data-sheet. Type CV3789 was first introduced in 1961. See also1961 adverts.
