GE Military Stock 12AU7 / 6189W Platinum Grade / No Cryo Reviews

4.6 Rating 27 Reviews

Visit Product Page

Phone:

909.931.9686

Email:

joel.m@upscaleaudio.com

Location:

2058 Wright Avenue,
2058 Wright Avenue
California
91750

Visit Product Page

Sheldon Simon

Verified Reviewer

Author didn't leave any comments.

Helpful Report

Posted 3 years ago

Horacio Jervis

Verified Reviewer

“These are excellent 12AU7 tubes. I originally used 4 of these to replace the stock gain tubes in my PrimaLuna EVO 300 preamp. My rig consists of a VPI Classic, Sky 10 SUT, an Manley Chinook feeding the EVO 300 which connects to a pair of PrimaLuna Prologue Seven mono blocks. The results were spectacular, absolutely dead quiet, with subsequent improvement in all dimensions: bass, midrange, top end, etc. The black background really helped flesh out vocals and mid bass, sound staging and imaging presented more holographically with improved air and space around instruments, and depth in the recording. Ultimately, I also replaced the 2 cathode follower tubes with these GE 12AU7s, resulting in more subtle improvements, but which helped with the overall presentation.”

Helpful Report

Posted 3 years ago

Jerry Johnson

Verified Reviewer

“Nice! Got them in my Primaluna Prologue integrated. Another upgrade that improved the sound. I Really love these valves”

Helpful Report

Posted 3 years ago

Author didn't leave any comments.

Helpful Report

Posted 3 years ago

Author didn't leave any comments.

Helpful Report

Posted 3 years ago

“Super !! The best !”

Helpful Report

Posted 3 years ago

Jeffrey Iida

Verified Reviewer

“I was very disappointed in this purchase. Unlike the Levi / Positive Feedback Magazine review, the pair I received are extremely noisy in my Rogue Sphynx; easily heard at my listening position even when quiet music passages are playing. This was completely unexpected given the Levi review stating his samples exhibited an extremely black background. In addition, both tubes have occasional random noise bursts. That said, the pair I received came extremely well-matched from measurement standpoints as the data on each box showed, so Upscale is doing their part. I would think that the excessive noise would have shown up during their pre-sale testing, however. I put my stock tubes back in and they are at least low noise, if not the best sounding pair I have tried.”