You didn't state how much time you had on your Svetlana's EL-34 tubes. They do have a bright edge when new. They need 40-50 hours to smooooooth out. I have the Svetlana EL-34's in my TA-30 and they do a great job. This is the fun part of tube rolling. You pick your flavor. You may have a better match with your system with one tube or another. Just give them time to break in first. Enjoy this great amp.
Stock Tubes on Cayin TA-30?
What kind of EL34 tubes are stock on the Cayin TA-30? I bought an extra set of Svetlana "Winged C" EL34's, and honestly i like the stock tubes better. the Svet's seems a little too bright and the imaging seemed better to me on the stock tubes.