Hi Ernie,
The best 300's (Best value for sure) that I used in my Franks were the original Shuguang Black Treasures and I found them to be warm and very engaging. They were fantastic and for the price a very good tube. To better it, I needed the EML Mesh 300's.
The best 300's (Best value for sure) that I used in my Franks were the original Shuguang Black Treasures and I found them to be warm and very engaging. They were fantastic and for the price a very good tube. To better it, I needed the EML Mesh 300's.