(19 votes, average: 3.58 out of 5)
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Tube Maze
Guides and reviews of vacuum tubes and tube equipment
Nice! Here is another winner from the Ken-Rad lineup. This tube reminds me significantly of their 5814, but with a much bigger soundstage. Several key properties push this valve far beyond the “usual suspects”—offering a creamy sound, superb transparency, and absolutely fantastic mids. And then there is the low end: bass, bass, and more bass!
The specific version I have is the military VT-163, and the ruggedized construction truly shows in the staggering amount of detail present. The signature is quite different compared to my other favorite, the RCA 6C8G; while the RCA might win in sheer delicacy, the Ken-Rad 6C8G Round Plates wins hands down in presence and authority. It comes HIGHLY RECOMMENDED.
Understanding the 6C8G vs. the 6F8G
While both the 6C8G and the 6F8G are vintage double triodes with top caps, they are not interchangeable. The 6C8G is a high-mu triode (with an amplification factor of approximately 36), whereas the 6F8G is a medium-mu triode (amplification factor of about 20).
In practical terms, the 6C8G is the octal-base predecessor to the 12SL7, providing more gain and a “creamier” texture that excels in preamplification stages requiring more drive. The 6F8G, conversely, is the predecessor to the 6SN7 and is prized for its linearity and balanced transparency. While the 6F8G is often the choice for a “window into the music,” the 6C8G is the choice for those who want that massive soundstage and rich presence.
Final Verdict
The Ken-Rad 6C8G Round Plates is a master of presence. It takes the best qualities of vintage American glass—creamy mids and authoritative bass—and scales them up into a huge, holographic presentation. If you are a fan of the Ken-Rad 5814 but want more “meat on the bones,” this is the tube for you.