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New old stock RCA 12AT7 / ECC81 dual-triode vacuum tube. A desirable vintage American-made RCA tube with strong, closely balanced sections.
Maxi-Preamp Test Results:
• Gain (Mu): 50.1 / 53.5
• Transconductance (mA/V): 1.90 / 1.94
The tube was tested for gain and transconductance, with both sections measuring strong and closely balanced. It comes with the RCA box shown in the photographs.
Please review all photos for the exact tube, markings, box condition, and test results
