TELEFUNKEN ECF86 – 4 PCS
GRADE: GOLD SERIES | PRECISION LABORATORY MATCHED
Top Ring Getter
Grey Plate
Diamond Bottom
Made in Germany
AVO Type 160 Tested
Grey Plate
Diamond Bottom
Made in Germany
AVO Type 160 Tested
Offered here is a premier matched lot of 4 vintage TELEFUNKEN ECF86 triode-pentode valves, production dated to the 1967 era. These tubes sport the highly coveted authentic Diamond Bottom mold mark in the glass base, alongside Grey Plates and Top Ring Getters.
Each tube has been meticulously tested and graded on an AVO Type 160 tube analyzer. Percentages are derived from original factory design-center 100% specs:
- Triode Section (1st Plate): Nominal Ia = 14.0 mA / mA/V = 5.5
- Pentode Section (2nd Plate): Nominal Ia = 10.0 mA / mA/V = 12.0
| Serial No. | TRIODE SECTION (1st Plate) | PENTODE SECTION (2nd Plate) | ||||||
|---|---|---|---|---|---|---|---|---|
| Result Ia | % Ia | Result mA/V | % mA/V | Result Ia | % Ia | Result mA/V | % mA/V | |
| 5274014 | 13.4 mA | 96% | 5.5 mA/V | 100% | 9.0 mA | 90% | 9.0 mA/V | 75% |
| 5274015 | 11.9 mA | 85% | 4.6 mA/V | 84% | 7.0 mA | 70% | 8.5 mA/V | 71% |
| 5274007 | 12.0 mA | 86% | 4.7 mA/V | 85% | 9.5 mA | 95% | 12.0 mA/V | 100% |
| 5274011 | 11.9 mA | 85% | 4.8 mA/V | 87% | 11.0 mA | 110% | 10.0 mA/V | 83% |
Note: Custom duties and Taxes are the Responsibility of the Buyer in their Country.
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NOS Audio Tubes — Mumbai, India
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