12AT7 / ECC81, Guitar Amp Tube from Mesa Boogie.
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but your help will be much welcomed
Other names: 12at7/ecc81, 12at7 ecc81, 12at 7 / ecc 81, 12 at7 / ecc81, 12 at7/ecc81, 12at7ecc81, 12 at7ecc81, 12at7 / ecc81, tube12at7, tube 12at 7, tube 12 at7, tube12 at7