Love these old war stories. Yes, I subscribed to the old Audio Mart circular too, and recall waiting for it with bated breath.Yes, IIRC it sometimes came every two weeks or so, and sometimes a little less frequently. My impression was that it was published whenever enough ads were accumulated to fill an issue.
It came every two weeks, right?
I suspect that was the underlying reason for Walt's objection that I mentioned above to an ad having an asking price he felt was too high. He probably didn't want members initially asking too much and then making repeated submissions of the same ad at progressively lower asking prices, which would result in him having to publish more frequently, which would increase his publishing costs correspondingly.
Best regards,
-- Al