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No Soviet tubes here but I have used the 6FQ7/6CG7 in place of the 6SN7.
A few years ago I came upon a Baldwin organ that had dozens of 6SN7s (and tons of minty cloth wire) so I'm set for a long time (might be worth selling some).
The 6SN7 is just 2 6J5s sharing an apartment...
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