12AT7 / ECC81
12AT7's have a lower voltage gain than 12AX7's. They have a higher plate current and transconductance, making it popular for guitarists who want cleaner headroom, and lower the gain in their amp. 12AT7's are also great for hi-fi applications that need a quieter tube in their circuit. ECC81 is the European equivalent.
12AT7's can replace your 12AX7 or 5751 for lower gain.
12AT7's can replace 12AY7 if more gain is desired.
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