Amperex 12AT7 / ECC81 NOS
NOS Single Tube
Original Amperex Box
Double Mica
Short Grey Plate
Original Amperex Box
Double Mica
Short Grey Plate
Available for purchase is a premium Amperex 12AT7 / ECC81 dual triode, Serial No. 2138001. This high-performance valve features a Double Mica spacer, Short Grey Plates, and a Top Ring Getter. The tube is New Old Stock (NOS) in its iconic green and yellow original Amperex box and has been laboratory tested on the Amplitrex AT1000 Digital Tube Tester.
- Type: 12AT7 / ECC81 Brand: Amperex
- Condition: NOS in Original Box Construction: Double Mica / Short Grey Plate
- Origin: Made in Holland Testing: Amplitrex AT1000
High Performance Screening: Tested against reference parameters (Ip=10.0,Gm=5500) for the ECC81 family.
Amplitrex Characterized: Measurements confirm excellent health with balanced gain (Mu) and low plate resistance (RP) across both triode sections.
Amplitrex Characterized: Measurements confirm excellent health with balanced gain (Mu) and low plate resistance (RP) across both triode sections.
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer in their country.
| Sr. No. | Test Triode | Parameter Ip (mA) | Result Ip (mA) | Percentage Ip | Parameter Gm (uMhos) | Result Gm (uMhos) | Percentage Gm |
|---|---|---|---|---|---|---|---|
| 2138001 | T1 | 10.0 | 8.6 | 86% | 5500 | 4740 | 86% |
| T2 | 10.0 | 8.2 | 82% | 5500 | 4610 | 83% |
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