New old stock Amperex 12AU7A / ECC82 vacuum tube, made by Mullard Blackburn with B3H4 factory/date code. Comes in the original Amperex box.
Tested strong and closely balanced:
Test Results:
MU / Gain: 16.5 / 16.1
mA/V: 1.49 / 1.47
Noise: 85.7 / 85.6 dB
Microphonics are excellent — almost zero microphonics. Tap is barely audible when the tube is tapped, with no ringing, lingering, or excessive feedback
| Listed | 2 months ago |
|---|---|
| Condition | Excellent (Used) Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.Learn more |
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Product safety information may be available here.

