One thing I noticed is the SBB-1 says 60W max. The FT-2900R does up to 75W (but doesn't seem like you need to use that much.)
What happens if you push 75W to it? Does it explode or make some cool fireworks?
84 FJ60 The TuRDle
& '89 Pickup Ext Cab DLX 22RE/5spd