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Old 25th January 2012, 08:00 AM   #1
hal1 is offline hal1  Israel
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Default Amperex Orange Globe 12ax7 ,Brimar cv4004


Considering that the BB's go for nearly twice what the orange globes go for, doesn't it make more sense to keep buying the Orange Globes?
What differences are there in terms of materials, production techniques, sound quality that might account for the premium price of the BB's.

How good is Brimar 12AX7 CV4004 or 12ax7?
How does this compare to the amperex? (orange globes)

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Old 25th January 2012, 08:24 AM   #2
SY is offline SY  United States
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I have Amperex 12AX7s with orange globes on them which clearly come from different factories. And tubes with other brands printed on them which clearly come from the same factories as some of the Amperex.

The ink on the tube doesn't really have much effect on the performance. This is stamp collecting, not electronics. Don't expect rational explanations.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 25th January 2012, 09:31 AM   #3
DF96 is offline DF96  England
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Both Mullard and Brimar made different versions of ECC83/12AX7/CV4004. In some circuits they may sound slightly different. In many circuits they will sound the same. Bear in mind that sample variation within one design version may exceed differences between versions. After all, these were all ECC83!

In addition, as SY says, you can buy genuine Mullards which were not made in a Mullard UK factory or not even in a Philips group factory (same for Brimar). They are genuine in the sense that Mullard printed (or had printed for them) their name on the glass. You can also buy valves made in a Mullard factory, but with other markings on the outside of the valve.

Ignore the ink on the outside. Learn about Philips group factory etch codes, as these are more informative (although they can be faked for popular/expensive valves).
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Old 25th January 2012, 01:03 PM   #4
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Do you have photos of tubes?
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Old 25th January 2012, 03:50 PM   #5
hal1 is offline hal1  Israel
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Thanks for your responses.


I'm asking befor buying.

Thanks for your help!

Last edited by hal1; 25th January 2012 at 03:52 PM.
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Old 25th January 2012, 04:49 PM   #6
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Anyway, better to see internal construction before buying ...

Good luck!
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