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Old 12th June 2013, 05:02 PM   #1
el156 is offline el156  Portugal
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Default Wich factory made this tube ?

Hi ! I have some of this 12AT7 with Brimar brand, but i heard that Brimar never made tubes, and this ones dont have any data codes or any other numbers, just Brimar and 12AT7 on it...do someone have any clues about the make of it ? Is it a Philips ? Mullard ???
Thanks
Attached Images
File Type: jpg 12AT7 Brimar 007.jpg (975.7 KB, 267 views)
File Type: jpg 12AT7 Brimar 002.jpg (819.1 KB, 251 views)
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Old 12th June 2013, 06:46 PM   #2
DF96 is offline DF96  England
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Brimar was one of the major British valve makers. If the valve was made by them then it should have a date code on it. These are smaller and use a different code from Philips/Mullard. Look for a line of letters and numbers looking something like 1B4/1234.

That valve you have might possibly have been made by RFT, as Brimar did what everyone else did towards the end of the valve era: they remarked valves from Eastern Europe. The bright red pin seals can indicate Eastern manufacture.
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Old 12th June 2013, 07:49 PM   #3
el156 is offline el156  Portugal
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Quote:
Originally Posted by DF96 View Post
Brimar was one of the major British valve makers. If the valve was made by them then it should have a date code on it. These are smaller and use a different code from Philips/Mullard. Look for a line of letters and numbers looking something like 1B4/1234.

That valve you have might possibly have been made by RFT, as Brimar did what everyone else did towards the end of the valve era: they remarked valves from Eastern Europe. The bright red pin seals can indicate Eastern manufacture.
There are not date codes in this tubes...nothing ! Maybe the boxes can help to identify ???
Attached Images
File Type: jpg 12AT7 Brimar 010.jpg (844.6 KB, 206 views)
File Type: jpg 12AT7 Brimar 011.jpg (971.7 KB, 179 views)
File Type: jpg 12AT7 Brimar 012.jpg (950.3 KB, 170 views)
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Old 12th June 2013, 10:05 PM   #4
DF96 is offline DF96  England
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No, the box will tell you nothing (except, perhaps, to an expert roughly when the valve was boxed). I believe the Thorn logo means a fairly late date, which tends to increase the chance that the valve might not have been made by Brimar themselves.
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Old 13th June 2013, 10:23 AM   #5
316a is offline 316a  England
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Brimar used black anodes with either folded box or oval black anodes . Those have alignment holes and grey anodes . Possibly RFT although I cannot be sure . RFT 12AT7 usually had a distinctive getter support . If you can provide a picture of this I may be able to confirm

316a
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Old 13th June 2013, 12:52 PM   #6
hooman is offline hooman  Iran
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i found some tube like russian 6x5 and rft12au7 in brimar box.i love original brimar hifi tubes . different sound
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Old 13th June 2013, 04:38 PM   #7
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Im going to spoil this one for you. Its a RFT ecc81

Notice the copper lead in wires, only Russian, RFT and TESLA tubes seem to have that.

Click the image to open in full size.


Cheers, V4lve
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Old 13th June 2013, 06:50 PM   #8
el156 is offline el156  Portugal
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Quote:
Originally Posted by 316a View Post
Brimar used black anodes with either folded box or oval black anodes . Those have alignment holes and grey anodes . Possibly RFT although I cannot be sure . RFT 12AT7 usually had a distinctive getter support . If you can provide a picture of this I may be able to confirm

316a
This are the best pictures of the getter i can get with my camera, i hope they can help to you to identify my tubes.
Thanks
Attached Images
File Type: jpg 12AT7 Brimar 013.jpg (738.3 KB, 35 views)
File Type: jpg 12AT7 Brimar 015.jpg (621.6 KB, 35 views)
File Type: jpg 12AT7 Brimar 014.jpg (688.0 KB, 23 views)
File Type: jpg 12AT7 Brimar 012.jpg (751.5 KB, 24 views)
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Old 13th June 2013, 06:58 PM   #9
DF96 is offline DF96  England
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Yes, almost certainly RFT - the getter supports are the giveaway. Possibly other 'Eastern' makers - I think I have seen Hungarian Tungsram which look like RFT designs.

Not made in a Brimar factory, but probably still a good valve. RFT had a good reputation.
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Old 13th June 2013, 07:56 PM   #10
el156 is offline el156  Portugal
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Quote:
Originally Posted by DF96 View Post
Yes, almost certainly RFT - the getter supports are the giveaway. Possibly other 'Eastern' makers - I think I have seen Hungarian Tungsram which look like RFT designs.

Not made in a Brimar factory, but probably still a good valve. RFT had a good reputation.
The funny thing is that i have some EL84 with the same logo on them, maybe they were made in the same factory as the 12AT7 that i have...have a look
Attached Images
File Type: jpg EL84 Brimar 001.jpg (687.2 KB, 22 views)
File Type: jpg EL84 Brimar 003.jpg (694.7 KB, 13 views)
File Type: jpg EL84 Brimar 006.jpg (447.1 KB, 22 views)
File Type: jpg EL84 Brimar 002.jpg (658.3 KB, 20 views)
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