best 6dj8 tubes for AR sp9mkII???

I agree with Vtvu. I have used the Sovtek NOS 6922 (6H23) from Upscale in my ARC LS25 with stunning results. The actual designation for this tube is 6H23.

I recently bought a couple of Gold Aero Platinum Grade Gold Pin 7308's, made in Germany (probably by Siemens) from Stereo Unlimited is San Diego (619-223-8151) for $35 each. They sound really good in my SP9 MkII. You could also try Valvo 6DJ8's, if you can find them.

I'm with Dacostab on the recommendation for 7308s. To my ears, almost any type of 7308s have consistently outperformed 6DJ8s and the 6922s I have tried (including the 6922 Sovteks).

Plato: Did you use the 6H23 tubes? If not, please limit the scope of your comments.

Almost always NOS tubes outperform the 6DJ8 made today. I have a AR SP9 MKll and I sell tubes. I know. The Reflektor tubes 6H23 branded Sovtek, are good. They are consistently noisier(hiss),and microphonic than NOS, even the less exotic ones, ie; GE 6dj8. If you can find NOS at a price you can afford, I'd get them.My favorites are Valvo Red Label, Siemans, and Telefunkens. These are all pricey.