The Audion Sterling can take EL-34, 6550, KT88, KT90, 6L6 and 7027A power tubes, according to what I've read. This applied to the discontinued Sterling - I don't know if it holds for the new Sterling line.
Jadis JA30, 80 and 200. I believe that some Cary amps can use multiple types of tubes, and the Rogue amps can take either KT88s or 6550s, not sure about other types.
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