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RE: GRAAF GM 200

I also have owned a Graaf Gm 200 and have been very happy with it. It seems as though you have done quite bit of experimenting with the PL504 out put tubes. With your experience have you found any sound difference between different manufactures of the PL504 tube. Also,for sound quality does the set of tubes need to be from the same manufacturer. My amp, which I have had for last ten years, has at the moment a number of different brans of tubes. These included National Electrics CVC Chember and many unbranded. Can biasing the amp overcome any difference with the tubes.I have found a set of 32 PL504 from Valvo made by Mullard. Have you had any expierance with these tubes. Appreciate your advice.
Cheers Ian


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