DOWNLOAD: SimpleTubeAudioOsc
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The 6SN7 is a highly desireable tube and should not be used frivolously.
Plus, why on earth would anyone build a tube audio oscillator when HP 200s and their clones are widely available, cheap, and superb? Coals to Newcastle and all that.
That Collins transmitter on the cover would be worth a lot of money today. So would the receiver off on the right.
Note also in this oscillator, the frequency setting element is a pair of pots rather than a capacitor or PTO/inductor. The frequency stability is going to be terrible. remember, the Wien bridge only oscillates when gain is exactly at a certain figure. Commercial audio oscillators were of the heterodyne type until Dave and Bill figured out how to use a light bulb as a stabilizing element. This made them multimillionaires and built an electronic empire that lasted until the Broad Restructuring and the spinoff of Agilent.