I would give BAT a call and ask them about driving that 30ft pair of ICs. They should be able to tell you if one is better than the other in that particular application.
The 42 will be two generations newer, so less chance of needing a recap or other maintenance like the EL display, which was something of a weak point in their older (the 50) gear. I had to have one replaced in my VK-300 integrated.
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Glenn...
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