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 Post subject: 6109 Tube?
PostPosted: Oct Sat 28, 2006 5:44 am 
Member

Joined: Oct Mon 02, 2006 8:55 pm
Posts: 69
Can anyone help me? I have an old amplifier and there is a tube (I believe preamp) that I can't get any informatioin about.

It has 9 pins, looks like a 12AX7 type, and on the glass is printed horizontally "CBS" with "6109" printed vertically. I can't make it out entirely but between the CBS and 6109 is printed "Made in USA." The matching pair tube is ECC83.

I searched google and a few tube sites but they come up empty.

Thanks


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 Post subject:
PostPosted: Oct Sat 28, 2006 1:13 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 564
Location: Wisconsin
That's probably a date code. If the tube in the other channel is ECC83, then it is a 12AX7 variant.

Tom


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 Post subject:
PostPosted: Oct Sat 28, 2006 2:40 pm 
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Joined: Oct Mon 02, 2006 8:55 pm
Posts: 69
Date code...interesting. First time I read of date codes on tubes. Learning so much everyday.

Thanks Tom


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 Post subject:
PostPosted: Oct Sat 28, 2006 7:15 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 27605
Location: Detroit, MI USA
Yes, they had to put date codes onto tubes to prevent fraud, such as customers returning used tubes that were cleaned up to look like new ones, or unethical dealers reselling used tubes as new ones.

All tubes and most major components like controls, transformers, etc. will usually have a date code somewhere.

Also at some point in time manufacturers used water soluble lettering on the tubes so that if anyone did try to clean them, the brand name and date code would wash right off, making them impossible to return or resell as new tubes.

_________________
Dennis

Experience is what you gain when the results aren't what you were expecting.


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