as it featured the LCD display with Target ID, and your 'B' version had audio Tone ID. You had control of ground balance and three models to select from (GB All Metal, GB-Discriminate (motion), and TR-Discriminate. It was definitely one of the typical 4-filter type detectors of the period and that meant it required a very fast sweep speed for any sort of decent performance.
You will find most models offered today that provide visual TID, and some that also have audio Tone ID. Most are limited to 2 or 3 tones, or perhaps a few more based on a limited number of notch segments. A very few will offer a wide-ranging Tone ID that mirror an equally wide range of TID readings. Few top-end models provide manual GB like we used to know it, and most of the best feature auto-tracking GB circuitry.
You will find that virtually every model offered today will have a much better balance and feel. You're not going to find any detector made today to require that very fast-sweep operation. That's the good news. With my age and health and bad back and shoulder, I can't work those old favorites like I used to, either.
There is one thing about your 9000B that made it very versatile and helped them work well for most of the hunting you plan to do that you WILL NOT find offered today, and that is a standard coil close to what those old Tek's came with. The stock 7