Hitachi 12AX7/ECC83 Matched Pair – Black Long Plate Top Ring Getter Made in Japan
NOS Matched Pair
New In White Box
Black Long Plate
Top Ring Getter
New In White Box
Black Long Plate
Top Ring Getter
Offering a premium New Old Stock (NOS) matched pair of 2 Pcs Hitachi 12AX7 dual triodes, Serial Nos. 4647004 and 4647005. These authentic Japanese-made valves feature the highly regarded Black Long Plates and Top Ring Getters. Hitachi’s long-plate construction is prized for its rich, expansive soundstage and detailed frequency response. Both units are supplied in New White Boxes and have been precision characterized on the Amplitrex AT1000.
- Type: 12AX7 / ECC83 Brand: Hitachi
- Condition: New in White Box Construction: Black Long Plate
- Origin: Made in Japan Testing: Amplitrex AT1000
Laboratory Characterization: Tested against factory reference parameters for 12AX7. This pair demonstrates strong, balanced performance with transconductance readings exceeding nominal ratings.
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer in their country.
| Sr. No. | Test Triode | Parameter Ip (mAdc) | Result Ip (mAdc) | Percentage Ip | Parameter Gm (uMhos) | Result Gm (uMhos) | Percentage Gm |
|---|---|---|---|---|---|---|---|
| 4647004 | T1 | 1.2 | 1.4 | 117% | 1600 | 1700 | 106% |
| T2 | 1.2 | 0.8 | 67% | 1600 | 1500 | 94% | |
| 4647005 | T1 | 1.2 | 1.0 | 83% | 1600 | 1700 | 106% |
| T2 | 1.2 | 1.1 | 92% | 1600 | 1600 | 100% |
✉️ For technical inquiries, please Email us at [email protected]
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