The circuit is a fairly easy design: It consists of the actual VCO (ICL8038 with supplement parts), the sine and triangle output stage (LT1210) and the CMOS-compatible output stage using the MOSFET driver chip ICL7667.
http://www.triplespark.net/elec/oscillator/ICL8038/
To speed testing, the circuit generates a composite audio signal comprising 10 sine waves of 10 different equal-amplitude frequencies across the audio band. Values stored in EPROM determine the frequencies.
http://www.edn.com/archives/1994/070794/14DI7.htm
Two oscillators, one adjusted to 7.02 MHz, the other to 7.20 MHz, together form a stereo sound carrier generator for 13 cm ATV Tx. Both oscillators are built identical and the outputs are simply put in parallel.
http://pe2er.nl/13cmATV/index.htm
http://margo.student.utwente.nl/el/analog/audosc.gif