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Looks like the sinewave is slightly clipped on the positive side. IIRC, those things would clip asymmetrically when one of the batteries would start to go flat. The 2 9V batteries are configured as a +/- 9V bipolar supply.
My first "real" set of test gear was the full set of 5280 series Heathkits which I put together while I was in high school. There were AF and RF signal generators, an RCL bridge, a signal tracer, and a FET input VOM. The whole set could be powered from an optional AC power supply to eliminate all the 9V batteries.
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