call Kevin Deal at Upscale Audio for relevant tube recommendations. He's on Audiogon.
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I have the same unit replaced the philips with some 60's Amperex,gold pins-sound superb-warmer overall and rounder bass-I also have a pair of Raytheon 7308's which are better than the Philips but not as good as the Amperex.
Kevin tends only to sell to previous customers especially NOS 6922's.
There's an excellent FAQ/Description of NOS tubes somewhere on the Web,can't remember where now perhaps a search might throw it up-it details the best of NOS tubes.
I'm in the UK,I believe buying NOS tubes here is about the only aspect of hi-fi that's cheaper than the US.
I've messed about with this unit a bit,I think whatever quality NOS tubes you use will be an improvement but I think also you have to be realistic about the improvement it will make considering the cost of the X-10D.
What's better- Chocolate or Vanilla ?? Siemens and Telefunkens are two of the finest NOS tube brands ever produced. You must determine exactly what characteristics you are after in a tube and then find the tube(s) to fill that specific need. If your component uses more than 1 pr. of tubes in the output stage- also consider a combination of different tube brands. Think of it as adding various spices to the sauce- A great sauce typically doesn't just contain salt and pepper.