Thanks so much. Now the challenge seems to be finding one. I can’t find anything listed as a JW 2C51. How different is it from the 396a? Even the 396a seems difficult to find in a single, balanced tube. Tube Depot lists a single NOS WE 396a for $99. I emailed them to ask about triode balance, and this was their response: “Thanks for your email. The age of this tube prevents us from accurately testing the triode balance. We apologize for the inconvenience.” Buying a pair off eBay seems like the only option.