The Sylvania 1950s 6SN7GT "Bad Boy" (or 1940s military 6SN7W if you can find it) is my favourite, but other good ones include the Shuguang Treasure CV181-Z, Russian 6SN7GT / 6H8C and Sophia Electric 6SN7.
The stock Tung-Sol is garbage, and some lower end Sylvanias are nothing special either.






















