NOS Brimar 5R4GY CV717 DD Dual Square Getter Black Plate Brown Base Balanced

Listing details

Why This Brimar CV717 Stands Apart

This genuine Brimar B.V.A. CV717 / 5R4GY was made in England and displays the substantial construction associated with sought-after early British examples: a tall glass envelope, brown phenolic base, large ribbed black plates, spring-supported filament structure and dual rectangular bottom getters—also described by collectors as dual square getters.

Its construction closely matches documented Brimar examples from the mid-1950s. The surviving date marking on this tube is faint, so the exact production year is presented as an estimate rather than a certainty.

The CV717 was designed as a high-voltage full-wave rectifier for demanding power-supply applications. Collectors and audio enthusiasts value this particular version for its distinctive early construction, limited present-day availability and Brimar’s respected British manufacturing heritage. The dual-getter arrangement is an identifying feature of this less commonly encountered variation.

More importantly, this exact tube offers the assurances that matter when selecting a vintage rectifier:

Genuine BRIMAR, B.V.A., CV717 and MADE IN ENGLAND markings

Preserved NOS history

Exceptionally clean glass, base and internal construction

Firm brown base and straight pins

Both rectifier sections freshly tested

Closely matching, strong P1 and P2 readings well within the Triplett 3444 RECT. OK range

Passed shorts and leakage checks

Photographed operating in the tester with visible filament illumination

Balanced Sections

100% Getter Flashing on glass, making photos of getters difficult, but DD getters are verified from visual inspection

The attached “60 mA / 100% NOS” label records the original supplier’s test notation and has been retained as part of the tube’s provenance. The fresh Triplett 3444 results are documented separately in the photographs so the buyer can evaluate the present performance of both sections.

Brimar CV717/5R4GY rectifiers are used by enthusiasts in compatible high-end tube amplifiers, headphone amplifiers and tube-output DACs. For best performance and service life, use this tube in equipment specifically designed or approved for the CV717/5R4GY electrical characteristics.

You will receive the exact tube shown. It will be supplied in a new white protective box and carefully packed for secure shipment.

VTubeAudio — vintage tubes individually identified, tested and documented so you know exactly what you are buying.

Storage area Vault BX BMT