Silver Cage
Top Ring GetterNew in White Boxes
Made in Great Britain
Amplitrex AT1000 Tested
Offered here is a premier, beautifully matched quad lot of 4 vintage MULLARD EF86 low-noise audio pentode valves, impeccably preserved in pristine white boxes. Made in Great Britain, these highly sought-after audio tubes feature the classic Silver Cage construction and a high-performance Top Ring Getter configuration, bearing the crisp, original Mullard shield and BVA decals.
Each individual tube has been rigorously verified on our laboratory-grade Amplitrex AT1000 digital tube analyzer. Following the exact formatting layout verified in image's, the comprehensive data table below provides the full side-by-side factory parameters alongside the laboratory-measured test results.
| Serial No. |
Test Triode |
Parameter Ip mAdc |
Result Ip mAdc |
% Ip |
Parameter Gm uMhos |
Result Gm uMhos |
% Gm |
| 931059 |
Triode |
3.0 |
3.1 |
103% |
1800 |
2100 |
117% |
| 931031 |
Triode |
3.0 |
3.1 |
103% |
1800 |
2000 |
111% |
| 931013 |
Triode |
3.0 |
3.1 |
103% |
1800 |
2000 |
111% |
| 931062 |
Triode |
3.0 |
3.0 |
100% |
1800 |
2000 |
111% |