COSSOR SU2150A / U.120A – 4 PCS
GRADE: MILITARY BROAD ARROW SERIES | LABORATORY VERIFIED
Inverted Cup Getter (Bottom)
Admiralty ‘D’ & Arrow Markings
AVO Type 160 Verified
Offered here is a premium matched lot of 4 vintage Cossor SU2150A high-vacuum, high-voltage half-wave rectifier valves. These premium examples feature an elegant, heavy-duty Clear Glass construction with an inverted cup getter cleanly positioned in the bottom near the base to keep the main envelope flawless.
As detailed , this batch carries exceptional British military provenance, deeply etched with the official Broad Arrow (↑) and the “D” stamp, certifying Ministry of Defence and Admiralty procurement. Every tube has been comprehensively evaluated on the AVO Type 160 tester. Following our meticulous percentage evaluation, the metrics below show how each valve performs relative to the 100% factory design specification (Factory Spec = 5.0 mA/V).
| Serial No. | Testing Parameter | Factory Spec (100%) | Measured Result | Performance Health (%) |
|---|---|---|---|---|
| 5356001 | Mutual Conductance (Gm) | 5.0 mA/V | 8.2 mA/V | 164% (NOS Strength) |
| 5356002 | Mutual Conductance (Gm) | 5.0 mA/V | 7.9 mA/V | 158% (NOS Strength) |
| 5356003 | Mutual Conductance (Gm) | 5.0 mA/V | 7.9 mA/V | 158% (NOS Strength) |
| 5356004 | Mutual Conductance (Gm) | 5.0 mA/V | 7.8 mA/V | 156% (NOS Strength) |
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