I have a 1987 Silver Jubilee 2554 combo. I am very fond of the tones I get. The only problem is that this model is the scandinavian SEM version without the 16ohm tap on the OT. 4 and 8 only. Applying to the danish, norwegian and swedish markets. The same thing as in many canadian models from that era from what I've read. That limits the versatility of this amp as I can't "borrow" 16ohm cabs from other amps. What separates these models from the international models electrically? Is it just the OT that needs changing? Or did they make more circuit changes to satisfy silly swedish regulations? I'm playing with the idea of converting it to international spec.