Best suggestion would be to contact Cary. As far as other alternatives, the "best" tube would be a pair of RCA Cunningham mono plates ca. 1930. These are extemely rare and even tougher to find in a matched pair. Almost just as good are the RCA NOS double plates (black) and Sylvania NOS, early 1940's. If you're looking for new production tubes, the platinum pair Sovtek mono plates are an excellent value. Just keep away from Chinese makes. Hope this helps.
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