GEC B65 / 6SN7GT METAL BASE – 2 PCS
GRADE: GOLD SERIES | LABORATORY VERIFIED NOS
Premium Black Plates
Classic Cup Getter
Clear Glass Envelope
Amplitrex AT1000 Tested
Up for sale is an incredibly rare, premium matched pair of 2 vintage GEC B65 / 6SN7GT dual triode valves, brand new in white boxes. These holy-grail British audio tubes feature the iconic metal base construction, clear glass envelopes, classic black plates, and a robust cup getter structure. Known globally for providing unparalleled transparency, rich texture, and massive soundstage, these are original GEC-manufactured valves carrying vintage Haltron branding stamps.
As shown , both units are laboratory verified using the industry-leading Amplitrex AT1000 digital tester. The test results display robust emissions and strong transconductance across all triode sections, offering an exceptional match for high-end audio preamplifiers and amplifiers.
| Serial No. / Tube | Tube Section | Plate Current (Ip) | Transconductance (Gm) | ||||
|---|---|---|---|---|---|---|---|
| Factory Spec | Result | % Ip | Factory Spec | Result | % Gm | ||
| GEC B65 (SR. 665007) | Triode 1 | 9.0 mA | 7.8 mA | 87% | 2600 uMhos | 2500 uMhos | 96% |
| Triode 2 | 9.0 mA | 7.4 mA | 82% | 2600 uMhos | 2600 uMhos | 100% | |
| GEC B65 (SR. 665010) | Triode 1 | 9.0 mA | 6.8 mA | 76% | 2600 uMhos | 2560 uMhos | 98% |
| Triode 2 | 9.0 mA | 7.8 mA | 87% | 2600 uMhos | 2700 uMhos | 104% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.











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