Congrats on your 337! I still love mine and use it every day. Definitely try to get some Tung-Sol 5998's for the power (front/big) tubes and some Tung-Sol mesh-plate 6SJ7GT's for the driver (rear/small) tubes.
And just as a reminder to everyone, NOS 6SJ7's take almost a full 24 hours to become hum-free. I was reminded of this last week as I burned-in a new set of the aforementioned TS mesh-plates - I had to run them for 3 days of 10 hours/day before they were totally silent. The first day they buzz really loudly all day. Then over the next 2 days they get progressively quieter. Now they are silent. This is just how they are!
And just as a reminder to everyone, NOS 6SJ7's take almost a full 24 hours to become hum-free. I was reminded of this last week as I burned-in a new set of the aforementioned TS mesh-plates - I had to run them for 3 days of 10 hours/day before they were totally silent. The first day they buzz really loudly all day. Then over the next 2 days they get progressively quieter. Now they are silent. This is just how they are!








Yes, actual hockey pucks. They are very effective at vibration control, they look nice, and they are very cheap.
LoL


