I just had the stock Chinese transformers of my Golden Age Project (GAP) Pre-73 DLX upgraded with Carnhill transformers by Bo over at GAP. Let me know if you'd like to hear an (un-scientific) comparison of before and after the mod.
You can also find sample clips of the difference over at Clipalator on the Zen Pro Audio website.
![](https://i.ytimg.com/vi/zZA7m5wuUqw/maxresdefault.jpg)