Wasn't there an episode in 1990 or 91 where there were three consecutive perfect one-bids in row? On the third one, the bell went off and Bob either didn't hear it or wasn't paying attention and began reading the ARP card. So the sound effects operator hit the key for the clangs/whoops. Bob did hear that and wisecracked, "What was that sound? I haven't heard that since the last time I was arrested." (though Bob has never been arrested) I don't ever recall seeing an episode with 4 perfect one-bids.
I KNEW I wasn't imagining that episode! I knew it had to be late 80s or early 90s, since Bob had gray hair, but the Turntable still had green borders and the green carpet, I remember that much...
* The clangs/whoops was on the first.
* The second one had the sound guy hit the "all overbid" key by mistake, then played the perfect bid bells, leading Bob to ask if they were just randomly testing the sounds out.
* The third had the proper sound effect, and Bob actually heard it. Then he joked, "Rod, you better print up some more $100 bills"