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Tube Maze
Guides and reviews of vacuum tubes and tube equipment
Another superb offering from Brimar. While the brand may not carry the same household recognition in audio circles as Telefunken or Mullard, it certainly should. Brimar has produced what are arguably some of the finest audio tubes ever made; their special types, such as the 6060 and 6067, stand among the very best dual triodes available.
A “Double Ultra” Rarity
The Brimar CV4068 (also known as the 6158) is a truly special find. It is an ultra-rare version of the already ultra-rare 13D3 tube—essentially a “double ultra” rarity!
While it wasn’t originally designed for audio applications, it performs exceptionally well in 12AU7 circuits. It is important to note the technical differences:
Sonic Character
The sound signature is impressively transparent without ever becoming fatiguing. It possesses a full mid-range reminiscent of the classic Mullard sound, but with a more transparent top end that feels significantly more airy. The bass response is equally impressive—both tight and full.
Final Verdict: If you are looking for a high-gain alternative to the 12AU7 that offers more air than a Mullard while maintaining a rich midrange, this is a top-tier choice.