Up for sale here is this used vintage RCA 12AX7 tube, from the 1950s and Made in USA. It has long black plates and a top angled D getter.  The lettering is almost gone, alas.

I tested this on my calibrated B&K 747B tube tester, and it tested at 78/85, with no shorts or grid emissions, on a scale of 0-120 where 65 is minimum good.  This is a great tube and is guaranteed to work well for you. Please see my pictures for details.

US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.

I have more tubes and other vintage electronics listed--feel free to take a look!