OP - I have a Gold Special DNA-1. The original transformer is about the only stock thing left in my amp. Steve McCormack never pressed me about going to the Plitron, but that's not to say that it wouldn't be an improvement. If you haven't done so, I would suggest discussing it with Steve. I have had my stock amp. upgraded three times by Steve. This last time was basically a rebuild of the amp. It sounds totally neutral, just passing the input signal to the speakers so they can do their thing. I plan to keep my amplifier forever. Literally. I would suggest discussing all options with Steve. He has never disappointed me.
