BK told me my amp, serial #--10, is one of the earlier 5150's produced. I beleive the upgrade is for the earlier models just to allow them to run a bit cooler. I didn't think it ran excessively hot anyway. Replacing the power transformer cured the buzz. Mine was a store demo and even though it looks flawless who knows how it was treated. They are built like a tank though and sound great. Hope to have mine for many years. Nice chatting with you Robin, time for another Newcastle and some tunes....Paul
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- 13 posts total
- 13 posts total