12AX7, ECC83, and 7025: Are They Interchangeable?
For a socket specified for a 12AX7, an ECC83 or 7025 is commonly sold as the same basic tube type. That does not make every tube whose name begins with “12A” an equivalent replacement. Check the amplifier manual and the exact manufacturer’s datasheet before buying, especially if the circuit calls for a particular tested version
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