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Old 13th February 2015, 06:20 PM   #1
el156 is offline el156  Portugal
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Default Brimar ECC83 with red bottom

I found this brimar tube in my old box with the bottom painted in red color, does this mean something ?
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Old 13th February 2015, 10:36 PM   #2
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No, it's a marker put there by a technician for some reason. Nothing to do with the manufacturer anyway.

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Old 13th February 2015, 10:48 PM   #3
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I have seen tubes with red paint and or maybe blue paint. Today going through some old tubes I actually remember seeing some with red paint on the top, they were GE 12AX7's made for CBS. I thought I remember reading somewhere that this meant they were screened for medical use or something.
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Old 14th February 2015, 09:46 AM   #4
el156 is offline el156  Portugal
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Well, i thought that means some kind of selection, but i pulled this tube from na old VOX amplifier (i think was an AC30)
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