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ECC81Sensibly equivalent¶ to:See also:
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The ECC81 was designed for RF use and is of medium impedance.Here we have a Zaerix device made in what was then East Germany and given as Made in GDR. The direct equivalence between the 12AT7 and ECC81 is made clear.
The reverse of the envelope.The thin glass tube envelope is 21 mm in diameter and excluding B9A base pins the length is 48 mm.References: Data-sheet & 1040. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  a(2) | g1(2) | k(2) | h | h | a(1) | g1(1) | k(1) | hct |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | 
| 6.3 | 0.3 | 250 | -2.0 | 10.0 | 10,000 | 5.5 |
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Updated March 12, 2022.
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