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RE: Help Identifying 12AX7 tubes

Posted by Jim McShane (D) on September 23, 2020 at 11:50:38

In Reply to: RE: Help Identifying 12AX7 tubes posted by lehmanhill on September 23, 2020 at 08:55:37:

I wouldn't have told you it was a Tung-Sol unless I was sure it was a Tung-Sol!

Also 322 is the EIA code for Tung-Sol.

Finally the getter shape is typical of early production Tung-Sols. Later tubes had round getters. The fact that your tube is a 12AX7 (not a 12AX7A) and that it has a square/rectangular getter simply means it is an early production tube. The fact that it is on an angle is just the way they made it in some of their early tubes.

If the tube has a 4 digit code after the "322" you can decipher the date of manufacture - the first two numbers are the calendar year and the second two are the week. For example 5922 would mean the 22nd week of 1959.

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