This is an oscillator exciter of high stability, derived mainly from a conveniently selected ClL ratio, but also attributable to the characteristics of the oscillator tube employed, a 6CL6, which at the same time functions as a buffer and multiplier. It substitutes to quite an advantage the preceding model N. 4/101, used already in the transmitter G 210-TR. Example of application: see transmitters G212-TR and G222-TR.