Just finished installing the drop in replacement Output transformer for my DSL 50. Two words. Holy S*$#. I already had the choke installed. All channels have a much better feel, the low end is tighter, and harmonics fly out of this amp now. Not only that, but the annoying hum that was present when powering up with the stock OT is gone. It's as quiet as a mouse. Whether that's related or not IDK. Either way, this was well worth it, and I'll soon be replacing the PT with one of your transformers. Thank you so much.