The electrical characteristics are close enough that the 6DJ8, 6922 and 7308 will all three work in the ARC circuit. There is one other possibility, the 7316, which is very low noise military version, also electrically similar to these other three. If you want an ultra clean and linear sound, try the USA Amperex 7308, especially the CEP version. Somewhat less linear and more warm would be the Dutch Bugle Boy 6DJ8, or the Mullard 6922. The Siemens 6922 CCA is a very detailed and low distortion tube, but is less friendly to bright recordings with the ARC. You did not say what you were listening to right now, and if you were happy with the tonal balance and dynamic range provided. I and others here can probably advise you, given that information, and what you like and dislike about the sound right now.
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