Hi
The failed lamps will not cause your problem but if you are getting a lamp kit then I would recommend a capacitor kit too. Also change the bias trimmers and then see where you are. I think the 1900-2 was the first Beomaster I restored and it is still giving my son much pleasure. Another potential problem is a failed potentiometer (bass, treble or balance). There are no replacements but they can be repaired with super-glue and a steady hand. Search for Martin's informative thread.
Richard
Some of my B&O: BV3/32, MX7000, MX5500, LX5500, MX4000, BM8000, BM6000, Overture, BL8000, BM6000 Quad, BM4400, BM3400, BG-CDX, BM3000, BM1001, BM1200, BM1600, BM1700, BM1500, BM1400, BM2400, BM2300, BM4500, BM4000, BVM70, BVS45-2, BVS60, BC7700, BM2200, BM1900, BG8002, BM1202, BVPenta, BVP45