I've been using Tung Sol's in my Modwright Tube SACD player. Very nice sound top to bottom and they remain quiet. If you look around you can get them for a very reasonable price.Good luck!
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Andy over at Vintage Tube Services is great! He's incredibly knowledgeable and will take the time to talk over the differences in tubes. He was super helpful when I was looking for different tubes for my old pre-amp. Ended up with some Mullards and loved them. Don't know if they made 5687s. Good luck with your search!