SIEMENS D3a — Quad 4 Pcs
Top Ring Getter
Grey Plates
Vintage 1969 Production
Date Code: B8 9F
Amplitrex AT1000 Tested
Up for sale is a world-class, exceptionally well-matched quad set of four pieces (4 Pcs) of vintage original Siemens D3a vacuum tubes. Highly sought after by custom audio designers and discerning audiophiles for premium phono stages, driver steps, and ultra-high transconductance triode-strapped configurations, these long-life German frame-grid pentodes provide unparalleled resolution, microscopic noise thresholds, and profound musicality.
This tubes comes in New in White Box these premium specimens showcase the iconic Siemens hallmark graphics and structural features. Meticulously produced in Germany during 1969, they feature identical B8 9F production date stamping, robust Grey Plate assemblies, and premium Top Ring Getter halos & Golden Pin. All four valves are in immaculate, clean physical shape with stellar pin structures.
Testing & Verification: Every tube in this quad set has been strictly processed and tested on our industrial Amplitrex AT1000 analyzer under factory conditions.
| Sr. No. | Test | Parameter Ia mA | Result Ia mAd | Percentage Ia | Parameter mA/V | Result mA/V | Percentage mA/V |
|---|---|---|---|---|---|---|---|
| 5078019 | T1 | 22.0 | 7.6 | 34.54% | 36 | 22.14 | 61.5% |
| 5078023 | T1 | 22.0 | 7.9 | 35.90% | 36 | 21.13 | 58.69% |
| 5078021 | T1 | 22.0 | 7.9 | 35.90% | 36 | 21.83 | 60.63% |
| 5078036 | T1 | 22.0 | 11.4 | 51.81% | 36 | 21.31 | 59.19% |
About NOS Audio Tubes
We are specialized suppliers of high-grade vintage vacuum tubes and valves, maintaining an industry lineage established back in the 1970s. With an extensive inventory of nearly 300,000 components, we serve high-end audiophiles and vintage equipment restoration collectors worldwide. Every tube is strictly evaluated using calibrated industrial testing instruments such as the Amplitrex AT1000 to guarantee absolute transparency.
Note: Custom duties and taxes are the responsibility of the buyer in their country.
Support: [email protected]
Whatsapp: +1 (630) 597-3966
NOS Audio Tubes — Mumbai, India
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