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How Many Brimars Are There??

I've owned many of the Mullard ECC82 & ECC83 variants and currently have a pair of the Brimar CV4003/12AU7 Boxplates (love these tubes). Now I'm looking to replace a Mullard 12AX7/ECC83 with a Brimar, but how many versions of the 12AX7 Brimar are there?
  I'm looking for a legitimate CV4004 Half Wing/ Box plate, but I keep seeing Brimars marked as CV492, CV492/CV4004, 12AX7, and 7025. Most online dealers state that these versions are the same as the CV4004 Boxplate. This doesn't make sense since some of these tubes have long blackplates, some have gray short plates, and some have the Gray Half Wing/ Box plate.

I don't believe Brimar would mark their tubes "12AX7" at the factory since this UK tube is known as ECC83. It looks like some of the tubes for sale have been remarked with new Brimar logos; it's easy to tell when compared to a tube marked with a factory code.
Does anybody know the real story about the production of Brimar valves in the 1950's and 60's?


lowrider57

Showing 1 response by tomcy6

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tomcy6
2,623 posts
 
British tubes were labelled 12AX7 if they were destined for the American market, because that’s what we called that tube. The British designation was C.V. 4004, Common Valve 4004. The European designation was ECC 83. I’m sure that Brimar painted all three designations on their tubes depending on who they expected to sell them to.

Vivatubes.com on eBay has exactly what you described. I haven’t bought anything from them but they have 100% positive feedback on 21,573 transactions, so I would at least talk to them.

www.ebay.com/p/Brimar-12AX7-ECC83-Vintage-Tube/166842589?iid=153041922562&_trkparms=aid%3D555018...
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