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Tube Maze
Guides and reviews of vacuum tubes and tube equipment
The Arcturus 5751 Black Plates D-getter is a very rare tube with truly unique sonic qualities. Initially, my expectations were modest because Arcturus transitioned to rebranding other manufacturers’ valves after 1952. However, upon inspection, it was immediately clear that this was no ordinary 5751; it featured long shiny black plates and a distinct bent D-getter.
Sonically, this tube is a revelation. It is exceptionally transparent with a superbly delicate touch, yet it maintains a very solid bass foundation. It stands out as one of the best-sounding entries in the 12AX7 family I have ever encountered. After significant research, the mystery of its excellence was solved: this tube is actually a rebranded Tung-Sol 12AX7 Black Plate in disguise.
A Brief History of Arcturus Tubes
The Arcturus Radio Tube Company, founded in Newark, New Jersey in 1925, is a legendary name from the early days of radio. They were famous for their distinctive “blue glass” tubes, which were marketed as a premium, high-quality alternative to standard clear glass valves. Arcturus was a true innovator, holding several important patents in tube filament design and cathode construction.
While they were a powerhouse of independent manufacturing through the 1930s and 40s, the post-war era brought significant challenges. By 1952, Arcturus ceased its own in-house production and pivoted to becoming a distributor. During this period, they sourced high-performance tubes from elite manufacturers like Tung-Sol and Raytheon, often putting their own branding on some of the finest American glass ever made. This Arcturus-branded 5751 is a perfect example of that “rebranding gold mine,” where a boutique label hides a world-class industrial masterpiece.
Final Verdict
The Arcturus 5751 Black Plates is a collector’s dream. It offers a rare combination of Tung-Sol’s legendary black-plate transparency and an incredibly delicate musicality. If you can find this specific vintage variant, grab it—it is a top-tier performer that rivals the most expensive 12AX7s on the market.