Replacing the stock 300Bs certainly did the most to reduce the hum for me (I'd already adjusted the hum balancer). Before that, replacing the stock 6SL7 with a 6SU7GTY also helped. The Psvane WE replica are the only other 300Bs I tried so I can't claim that they are the only tubes that help with hum. They are expensive, and one of the pair I ordered developed a short within the first 9 hours of use. It was quickly replaced by Grant Fidelity.