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It's a thermionic valve/electron tube with *two* triodes in the one envelope.

Examples: 3A5, 6J6, 6SN7/6SL7, 12AU7/12AX7, ECC32, ECC82.

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It's a thermionic valve/electron tube with *two* triodes in the one envelope.

Examples: 3A5, 6J6, 6SN7/6SL7, 12AU7/12AX7, ECC32, ECC82.

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