I recently picked up a Newcastle 18w. It's a great amp and I love it. I've been running it through a Dr Z attenuator for lower volume applications. I just came across a Newcastle 30 watt for sale with the power scaling. Has anyone had experience with both. Would it be worth selling the 18 and going for the 30? I've hear the fans can be a little loud and annoying in the 30. Any thoughts would be helpful! Thanks in advance.