NOS Matched Pair Philips 12AX7 / ECC83 Green Logo | Heerlen Δ | Kalibr L3-3
NOS 매치드 페어 Philips 12AX7 / ECC83 그린 로고 | Heerlen Δ | Kalibr L3-3
| 상품번호 | 198398853286 |
| 상태 | Open box |
| 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 premium, perfectly matched pair of vintage Philips Miniwatt 12AX7 / ECC83 / 12AX7S dual triode tubes (Internal References: TG0TM3 & TG0H1J) featuring the iconic green logo layout. This authentic vintage production from Philips is highly coveted by audiophiles and guitarists for its exceptional musicality, ultra-low noise, and rich soundstage. Both tubes are in genuine NOS / Test New condition, exhibiting outstanding, strong, and balanced characteristics. They have been thoroughly laboratory-tested on a professional, calibrated Kalibr L3-3 master tube tester.
Historical Provenance & Authenticity (Heerlen Factory)
Both tubes share the exact same production and date codes etched on the glass, proving they were manufactured side-by-side in the legendary Philips factory in Heerlen, Netherlands:
- Line 1:
I65(ECC83 / 12AX7 revision layout) - Line 2:
Δ3A5(Δ= Heerlen Usine,3= 1963,A= January,5= 5th week -> Manufactured end of January / early February 1963)
They come preserved inside their original, vintage Philips "Bon de Garantie" boxes which remain in good collector condition (marked 12AX7 7.3).
Key Features
- Brand: Philips Miniwatt (Classic Green Logo Graphic)
- Type: 12AX7 / ECC83 / 12AX7S
- Design: Authentic Green Logo / Short Gray Plates / Halo Getter
- Match: Perfectly Matched Pair (Same factory batch and identical date codes)
- Condition: NOS / Test New (Strong emission & transconductance)
- Packaging: Two original Philips "Bon de Garantie" boxes included
- Safety: Strictly tested, NO shorts, perfect insulation profiles.
Detailed Test Results (Kalibr L3-3)
Tested under reference operational conditions: Heater Voltage (Uh) 12.6V | Grid 1 Voltage (Uc1) -2V | Anode Voltage (Va) 250V
(Factory specification for a 100% brand new reference tube: Ia = 1.20 mA / S = 1.60 mA/V)
• Triode Section 1 - Anode Current (Ia): 1.59 mA (132.2% of factory spec)
• Triode Section 1 - Transconductance (S): 1.33 mA/V (102.0% of factory spec)
• Triode Section 2 - Anode Current (Ia): 1.43 mA (118.8% of factory spec)
• Triode Section 2 - Transconductance (S): 1.71 mA/V (106.6% of factory spec)
• Triode Section 1 - Anode Current (Ia): 1.66 mA (138.3% of factory spec)
• Triode Section 1 - Transconductance (S): 1.65 mA/V (103.3% of factory spec)
• Triode Section 2 - Anode Current (Ia): 1.70 mA (142.0% of factory spec)
• Triode Section 2 - Transconductance (S): 1.67 mA/V (104.4% of factory spec)
🌟 Seller Note on Performance: An absolute dream-tier matched set. Testing with immense emission and dynamic curves—reaching up to 142.0% of brand-new parameters with incredibly strong transconductance alignment—this time-capsule 1963 Heerlen pair ensures perfect stereo balance, tight structural definition, and zero channel drifting.
Structural & Insulation Tests Passed
Both tubes in this matched pair (SKU: TG0H1J & SKU: TG0TM3) have been individually audited and successfully met all 5 laboratory insulation criteria:
- Insulation test between Cathode (k) and Heater (H) 1st section: PASSED for both tubes (No leakage)
- Insulation test between Cathode (k) and Grid 1 (g1) 1st section: PASSED for both tubes (No shorts)
- Insulation test between Grid section 1 (g1) and Grid section 2 (g2): PASSED for both tubes (No inter-section leakage)
- Insulation test between Cathode (k) and Heater (H) 2nd section: PASSED for both tubes (No leakage)
- Insulation test between Cathode (k) and Grid 2 (g2) 2nd section: PASSED for both tubes (No shorts)
About our testing methodology
To provide full transparency, our laboratory testing uses a professional Kalibr L3-3 tube tester. Since this device uses specific internal scales rather than direct mA/V readouts, each value is physically calculated to ensure precision.
- Example of our calculation (Transconductance S):
Using a raw Kalibr reading of 82.6 on a standard scale of 150 with a multiplier of 3.0:
(82.6 x 3.0) / 150 = 1.65 mA/V - Percentage vs. Factory Specs:
We then benchmark this result against the factory nominal value for a new tube (e.g., 1.60 mA/V for a 12AX7):
(1.65 / 1.60) x 100 = 103.3% of factory specification.
Worldwide shipping with bulletproof packaging. Tracking number provided immediately.