New amps often have all kinds of "bells and whistles," but their electronic circuits DO have a limited life span, after which they can become VERY expensive doorstops. On the other hand, amps such as the SB-200, SB-220, and the like, can be made to work into at least the next millennium if treated properly. (2100 or longer.) WHY? Because they do NOT rely on fancy electronics, but ARE "bare" amps that require manual tuning, etc. The current amps are convenient, and allow almost "no thought" operation on multi-bands, but when they eventually go "bellies up," they become mere salvage material. But MY SB-200 (OK, not a full 1.5 kW but 6-800 Watts output) will still be going strong if I treat it nicely.