Made in England Grey Plate
Top Ring Getter
Amplitrex AT1000 Digital Testing
This listing features a high-reliability matched pair of vintage Brimar CV4003 dual triodes. These military-grade valves utilize a Grey Plate and Top Ring Getter construction, providing the superior mechanical stability and tonal balance required for critical audio applications.
Both tubes have been laboratory-verified on the Amplitrex AT1000 digital tester. Using our Percentage Method, the test results below show the performance of each triode section against the 100% factory design-center specifications (Ip = 10.5mA / Gm = 2200 µMhos).
| Serial No. |
Test Triode |
Parameter Ip |
Result Ip |
% Ip |
Parameter Gm |
Result Gm |
% Gm |
| 807169 |
T1 |
10.5 |
12.0 |
114% |
2200 |
2300 |
105% |
| T2 |
10.5 |
10.0 |
95% |
2200 |
2100 |
95% |
| 807107 |
T1 |
10.5 |
11.4 |
109% |
2200 |
2300 |
105% |
| T2 |
10.5 |
10.2 |
97% |
2200 |
2100 |
95% |