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?


128x128lowrider57
Brent Jessee of BRENT JESSEE RECORDING HOMEPAGE would most likely know. 

Here is a list of what he has in stock re: 12AX7 tubes: 12AX7 Tubes in Stock. I went blind trying to find what you asked for. If he doesn't have it in stock, he'll still know of it.

All the best,
Nonoise
@nonoise , thanks. Brent is one of my go-to-guys and he describes the tubes pretty well, but his prices for Brimars seem very high.

Here is a CV4004 boxplate, but don’t know anything about the dealer...
https://www.kcanostubes.com/content/nos-brimar-12ax7cv4004


This is a CV492 with same plates as a CV4004. But much cheaper than CV4004’s...
https://www.ebay.com/itm/True-NOS-Vintage-Brimar-CV492-Mil-Spec-12AX7-Long-Gray-Box-Plate-Vacuum-Tub...


Here is a 6057 that the dealer states is the same as a CV4004,
but Brent says... "One of the rarest Brimar made 12AX7 tubes is this long plate with the famous Yellow T decal on the glass. These are all the older long plate version that is so difficult to find today."
And to make it more confusing, the "T" is not yellow.
https://tubeworldexpress.com/products/copy-of-6057-cv4004-mullard-rebranded-brimar-t-nos-1981-gm-160...


I’m wondering if many of these tubes are being re-branded. The safe bet would be to go with Brent, but first I’m hoping one of our members knows some Brimar history.


@lowrider57 
That's a tough call what with all the counterfeits out there and not really knowing if those are one offs or fakes. At least Jessee can advise you even if you don't buy from him.

I wish I knew more but alas, I don't.

All the best,
Nonoise
Thanks, @nonoise .
There's a good discussion over at Tube Asylum without any real consensus. One item up for discussion is about this dealer who has admitted his tubes are re-branded, but insists they are genuine NOS.
http://www.tubeaudioproducts.com/Mullard-Brimar/Enlarge.aspx?ProductID=154

See the pretty label. UK does not use the 12AX7 code.