(52 votes, average: 4.13 out of 5)
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Tube Maze
Guides and reviews of vacuum tubes and tube equipment
After a long-awaited hunt, I’ve finally secured the elusive Mullard/RTC 5654/6AK5W. Known in specialized circles by its military designations, the CV850 and M8100, this tube is a visual standout. It features a distinct black plate structure characterized by a signature large hole in the anode, making it instantly recognizable to any seasoned collector.
In terms of sonic performance, this tube is a masterclass in what the 6AK5 family is capable of. It delivers a remarkably rich tone paired with powerful, authoritative bass and a lush, beautiful midrange. What truly sets it apart, however, is the added layer of top-tier transparency, ensuring that none of that warmth comes at the expense of detail.
About RTC (La Radiotechnique):
The RTC (La Radiotechnique) brand was a major French electronics manufacturer and a key subsidiary of the Philips/Mullard empire. Their tubes were produced in famous factories like the one in Suresnes, France. Because they shared technology and tooling with Mullard and Philips, RTC tubes like this 5654 are often sought after for their exceptional European engineering and high-grade military durability.
Final Verdict:
This is quite simply the gold standard for the 6AK5 signature. If you value a combination of muscular low-end and crystal-clear musicality, this tube is HIGHLY RECOMMENDED.