The 80's to mid-90's Yamahas were outstanding and were/are very good bang for the buck. I owned a 1984 BB3000, a very excellent recording bass which I stupidly sold at one point, as well as an early single truss rod TRB-6P that was my main bass from 1990 until about 2000. Over time, it became a "beta" bass and sported a few different pickup and preamp combinations, the best (and last) of which was Bartolini narrow soap bars with a Demeter preamp. Unfortunately, with the single truss rod in that massive neck it bowed radically with climate/humidity changes, and that problem seemed to get worse over time. The last straw was on a road gig where I flew into a city where the weather was very hot and dry, causing the neck to upbow so badly that it fretted out completely above the 15th fret. Obviously that didn't make me appear very professional, so I chose to retire the bass. it was a shame, because it was a great sounding and playing instrument. Yamaha went to the double truss rod configuration on the TRB-6P's pretty early on (mine was one of the first ones to come into the US). That solved the stability issue, but for me the bulkier necks on the double truss rod models didn't feel nearly as comfortable to play.