Vintage Philips DARIO ECC83 / 12AX7 Tube | Green Logo French Production | Kalibr
빈티지 Philips DARIO ECC83 / 12AX7 진공관 | 그린 로고 프랑스 생산 | Kalibr
| 상품번호 | 198404875893 |
| 상태 | Used |
| 거래유형 | 즉시구매 |
| 출고국 | 미국 (US) |
상품 설명
Professional Tube Laboratory Test Report
Every tube listed in my shop undergoes a rigorous testing procedure to ensure the highest fidelity and performance for your equipment.
- Testing Equipment: Professional Kalibr L3-3 Tube Tester.
- Precision Measurement: Measurements are verified using a calibrated Metrix MX 51EX digital multimeter.
- Transparency: All results are provided in the product photos, displaying specific Anode Current (Ia) and Transconductance (S) values compared to manufacturer specifications.
For sale is a highly collectible vintage French 12AX7 / ECC83 twin triode preamplifier tube (Internal Reference: TG3I07), manufactured by La Radiotechnique (RT) under the famous Dario Miniwatt brand. This tube stands out with its crisp, bright green shield logo print and distinct factory glass etching.
Authentic French RT Heritage & Construction
Renowned among audiophiles for rich harmonic warmth, deep soundstage, and smooth top-end resolution, this specimen features:
- Vibrant Green Print: Features the iconic green "MINIWATT ECC83 DARIO" shield logo, remarkably well-preserved.
- Glass Etching: Permanent factory glass code
12AX7-57-0etched near the base. - Internal Construction: Long ribbed grey plates, copper grid posts, top halo getter, and double mica spacers.
Key Specifications
- Brand: Dario Miniwatt (La Radiotechnique - Made in France)
- Designation: 12AX7 / ECC83 High-Gain Twin Triode
- Condition: Vintage Used - Lab Tested High-Emission (~96-116%)
- Packaging: Shipped without original box (Packed safely in a brand-new generic protective tube box)
Detailed Test Results (Kalibr L3-3)
Tested under reference laboratory bench conditions: Uh=12.60V | Uc1=-2.0V | Ua=250V
(Manufacturer specifications for a 100% factory-new reference tube: Ia = 1.20 mA / S = 1.60 mA/V)
• Anode Current (Ia): 1.15 mA (95.8% of factory spec)
• Transconductance (S): 1.45 mA/V (90.8% of factory spec)
• Anode Current (Ia): 1.39 mA (116.2% of factory spec — Ultra Strong)
• Transconductance (S): 1.72 mA/V (107.2% of factory spec — NOS Level)
🌟 Seller Note on Performance: Both triode sections demonstrate excellent gain and strong emission, with Section 2 testing above NOS factory specs. This makes it an exceptionally energetic driver or preamplifier tube for vintage Hi-Fi line stages or guitar amplifiers (V1 position).
Structural & Insulation Tests Passed
This specimen has been individually audited and successfully met all 5 laboratory insulation criteria:
- Insulation test between Cathode (k) and Heater (H) 1st section: PASSED (No leakage)
- Insulation test between Cathode (k) and Grid 1 (g1) 1st section: PASSED (No shorts)
- Insulation test between Grid section 1 (g1) and Grid section 2 (g2): PASSED (No inter-section leakage)
- Insulation test between Cathode (k) and Heater (H) 2nd section: PASSED (No leakage)
- Insulation test between Cathode (k) and Grid 2 (g2) 2nd section: PASSED (No shorts)
About our testing methodology
To provide full transparency, our laboratory testing uses a professional Kalibr L3-3 tube tester, cross-verified with a calibrated Metrix MX 51EX multimeter.
- Example calculation (Anode Current Ia Section 1):
Using a raw Metrix multimeter reading of 57.5 on a standard scale of 150 with a Kalibr scale factor of 3.0:
(57.5 x 3.0) / 150 = 1.15 mA - Percentage vs. Factory Specs:
Benchmarked against nominal 100% factory spec (1.20 mA):
(1.15 / 1.20) x 100 = 95.8% of factory specification.
Worldwide shipping with bulletproof packaging. Tracking number provided immediately.