My Cary PH 302 phono amp MM hum?

Hello Tobes, I have the original PH-302 and I wanted to ask your advice on changing the tubes. I see that you're using Sylvania 1968 era. What do you think of Sylvania 1944 army military VT-229/6SL7 GT?

I imagine your Sylvania VT 229s would be a truly good tube for the phono amp as long as they were quiet. How do you like them this far.

Hi Mechans, The tube are $80.00 plus tax and shipping. I need four $375.00. What do you think?

Hi, Thanks for getting back to me regarding the tubes. I have not purchased them yet. I would need four and they're $80.00 each.

Sorry to reply so late. I was away. The tubes which frequently is still available as NOS in their military boxes thus NIB (new in Box) is a great choice but the price is daunting. I had thought the 6SL7s would cost less. It is a decent price for the more widely used 6SN7. Is this from a really good vendor? If so I might just hold my nose and accept the cost. They will last a long time and have (I hope) been properly screened and sort of matched. I add that "sort of" because it is really hard to find close matching in tubes that old and rare. I would ask the vendor to match as well as they can, but in your circuit it may not matter. Make sure they are returnable because you really do need quiet examples. Good luck.
Steve