HYTRON VR-53 / EF39 – 4 PCS
GRADE: GOLD SERIES | LABORATORY VERIFIED NOS
Rare Metal Base
Grey Coated Glass Envelope
New in Original Boxes
Military Broad Arrow Marking
Amplitrex AT1000 Tested
Grey Coated Glass Envelope
New in Original Boxes
Military Broad Arrow Marking
Amplitrex AT1000 Tested
Offered here is an exceptional, pristine quad lot of 4 vintage HYTRON VR-53 / EF39 RF pentode valves, beautifully preserved and brand new in their original factory boxes. These premium variants feature robust metal bases and classic grey coated glass envelopes for maximum shielding and structural integrity.
As shown in, these tubes come in their authentic, original military-contract cardboard boxes. The box covers clearly display historical military contract stamps, including the official British Military Broad Arrow symbol, B.A.M. Reference No. 10E/11399, and Order No. 8523 – PHILA. – 45 – 12, verifying production by Hytron Radio & Electronics Corp. in Salem, Mass., U.S.A.
Every unit has been comprehensively verified on the Amplitrex AT1000 digital tester. The detailed laboratory results are systematically structured below, matching exact test figures alongside baseline factory parameters.
| Serial No. / Tube | Tube Section | Plate Current (Ip) | Transconductance (Gm) | ||||
|---|---|---|---|---|---|---|---|
| Factory Spec | Result | % Ip | Factory Spec | Result | % Gm | ||
| VR-53/EF39 (SR. 2910002) | Pentode | 6.0 mA | 6.1 mA | 102% | 2.2 mA/V | 2.8 mA/V | 127% |
| VR-53/EF39 (SR. 2910003) | Pentode | 6.0 mA | 7.0 mA | 117% | 2.2 mA/V | 2.7 mA/V | 123% |
| VR-53/EF39 (SR. 2910005) | Pentode | 6.0 mA | 8.1 mA | 135% | 2.2 mA/V | 2.4 mA/V | 109% |
| VR-53/EF39 (SR. 2910006) | Pentode | 6.0 mA | 7.6 mA | 127% | 2.2 mA/V | 3.1 mA/V | 141% |
Note: We have more than 1000 Pieces in Stock
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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