nzoomed
Member
I recently got a box of preamp tubes and all are ecc81, 82, 83 etc, but some have most of the writing missing as it seems to rub off really easy off the old valves.
I have a brimar ecc82 and a brimar tube which i think is an ecc83 but am not too sure as the writing is missing - i think it may say 12ax7, but its so faint i can not be 100% sure, the plates look identical in shape and length to my brimar ecc82, but at the same time my mullard ecc83 tubes have the same shape plate.
Date codes that are etched on the glass can be useful, but there is little information on brimar codes on the internet.
So what i really want to know is, if i get someone with a valve tester, will they be able to tell me what type of tube it is by the strength of the reading? Suppose you test it as an ecc82/12au7, if it is an ecc83, would i expect a stronger than normal reading than a 12ax7?
Thanks for any info.
I have a brimar ecc82 and a brimar tube which i think is an ecc83 but am not too sure as the writing is missing - i think it may say 12ax7, but its so faint i can not be 100% sure, the plates look identical in shape and length to my brimar ecc82, but at the same time my mullard ecc83 tubes have the same shape plate.
Date codes that are etched on the glass can be useful, but there is little information on brimar codes on the internet.
So what i really want to know is, if i get someone with a valve tester, will they be able to tell me what type of tube it is by the strength of the reading? Suppose you test it as an ecc82/12au7, if it is an ecc83, would i expect a stronger than normal reading than a 12ax7?
Thanks for any info.