Sylvania GB-5687 NOS Single Tube – / Gold Pins / Black Plate / Ring Getter / USA Made
Gold Grade
Gold Pins
Black Plate Construction
Ring Getter
Gold Pins
Black Plate Construction
Ring Getter
Offering 1 Pc premium Sylvania Gold Brand GB-5687 dual triode vacuum tube. This highly sought-after audiophile-grade tube features Gold-Pins, robust Black Plates, and a reliable Ring Getter structure. Renowned for its exceptional clarity, dynamic current drive, and ultra-low noise performance in high-end preamps and driver stages, this tube is New Old Stock (NOS) in a white box and has been laboratory tested on the Amplitrex AT1000.
- Type: GB-5687 Brand: Sylvania (Gold Brand)
- Condition: New in White Box Construction: Gold Pins / Black Plate / Ring Getter
- Origin: Made in USA Testing: Amplitrex AT1000
Key Features & Highlights
- Gold Pins: Ensures maximum conductivity, corrosion resistance, and flawless socket contact over time.
- Gold Brand (GB) Quality: Premium selected series manufactured to ultra-strict tolerances for audio fidelity and long life.
- Black Plate & Ring Getter: Classic vintage internal structure providing excellent linearity and quiet operation.
- Amplitrex AT1000 Verified: Fully tested under precise operating parameters for plate current and mutual conductance.
| Sr. No. | Test Triode | Parameter Ip (mAdc) | Result Ip (mAdc) | % Ip | Param Gm (uMhos) | Result Gm (uMhos) | % Gm |
|---|---|---|---|---|---|---|---|
| 5408002 | T1 | 12.0 | 9.6 | 80.0% | 5400 | 4100 | 75.9% |
| T2 | 12.0 | 13.0 | 108.3% | 5400 | 5200 | 96.3% |
Note: Custom duties and taxes are the sole responsibility of the buyer in their respective country.
✉️ For technical inquiries, please Email us at [email protected]
Whatsapp: +1 (630) 597-3966
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