Brimar CV4003 / 12AU7 Special CJ Test Grade / Yes Cryo Reviews

4.7 Rating 38 Reviews

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Eugene Levine

Verified Reviewer

“These are the best tubes I've tried in my Rogue Sphinx 2. I'm playing through Magnepan .7 speakers, a vn upgraded v. 1 MicroRendu, and a Project PreBox, with Audioquest interconnects and an RSL 1" Superspeed subwoofer. Using Quboz and a Qnap NAS. I've tried the current Telefunken (J&J) 12au7, which I did not find interesting, and did not improve the sound on my system (OEM 12au7 (J&J)s). I tried Cifte NOS from Upscale and loved them, but I have worn them out and cannot find replacements. I bought a pair of Telefunken NOS 12au7 which never worked reliably (microphonics in the Sphinx), so I gave up. The Mullard NOS (1962) were not satisfying.to me. So I am ecstatic about the Brimars. Hope they last.”

1 Helpful Report

Posted 3 years ago

Diosdado Gonzales

Verified Reviewer

“First off, I would like to thank, Randall from Upscale Audio for assisting me in returning a tube and getting a replacement quick and hassle free. I was using an upgrade tubes for my Rogue Audio Medusa amp and wanted to try the Brimar CV4003 because of the positive reviews. I wanted a little more HF extension and was hoping these tubes would provide it. They did and more. The HF are extended but are silky smooth, the mid also got a boost and maybe the bass too. What I really like about these tubes are how clear, smooth and detail they are. Definitely keepers. These tubes have transform my two channel system to another level.”

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Posted 4 years ago

“Works like it should! Highly recommend the upgrade!”

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Posted 4 years ago

“I followed Kevin's advice and bought only two tubes first for my PrimaLuna Dialog Premium HP integrated. Loved the improved sound. I then ordered four more. The sound improved again. Great and honest advice, and fast service.”

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Posted 4 years ago

Jeff Tollefson

Verified Reviewer

Author didn't leave any comments.

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Posted 4 years ago

Geary Stevenson

Verified Reviewer

“P”

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Posted 4 years ago