BRIMAR CV4003/12AU7 Made In England 100 Hours

Purchased recently from Upscale Audio

Platinum grade - The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.

Paid $88.53 including shipping

Sell for $63.53 including shipping in CONUS.

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From Upscale Audio's website;

This is the classic Brimar 12AU7 made in England in the 60’s . If you want to know how these sound, they are like the Ediswan CV2492/6922: Incredibly pleasant, wonderful, pleasing mids with zero harshness. When I listen to these, it reminds me of a girl I knew once that would touch the back of my neck. They are that nice. I have to say something here. I’ve seen a flying lead version being sold with an adaptor on the bottom. It’s the exact same tube. But uses an adaptor soldered on to the bottom. I had some offered to me but passed. Soldering those leads isn’t exactly the cleanest way to do things. Why would you want an adaptor on the tube leads? That’s fine to use later after these dissapear from the market, but not now while you can get the real deal.

Each tube is graded carefully on both an Amplitrex AT-1000 and a Triplett 3444a. After that we grade for noise and microphony by ear with headphones in a single-tube moving coil phono stage circuit where the tube is really under a microscope and listed to with headphones