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RE: Help Identifying 12AX7 tubes

Posted by lehmanhill (A) on September 23, 2020 at 08:55:37

In Reply to: RE: Help Identifying 12AX7 tubes posted by Tom Bavis on September 23, 2020 at 07:34:46:

Thanks Guys,

Based on the Tung-Sol suggestion, I was able to find images of Tung-Sol tubes with the exact same elongated octangle marking, so it clearly is a Tung-Sol. From the notes connected to the images, it seems to be 1950's, or more likely 1960's. That makes sense given the Philbrick analog computor era.

I haven't been able to find pictures that show the same getter design. There was one photo that might have been, but it wasn't clear enough to tell.

Tom,

What do the getters in your Tung-Sol "Computor" tubes look like?

Alas, the part number on mine starts with 322, but it is white like the GAP/R marking, so I wasn't sure that was a Philbrick part number or a tube manufacturer part number. Given the elongated stop sign, I guess it counts toward Tung-Sol.

I know that era Tung-Sol can be good audio tubes, but I continue to wonder about the angled getter. Unfortunately, I don't have a 12AX7 audio device to try them in.

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