Offered is a lot of (4) 6U7G tubes. (3) are by Silvertone and (1) is by GM.The tubes each test good on the EICO dynamic tester and they show no shorts. The tubes have black plates and smoked grey glass interiors.  Date Codes are as follows (2) 7AX, 0AX and G7 for the GM tube. These are used exclusively in Radio RF circuitry.  Two Silvertone and the GM have hot-stamped base graphics.  Pick up the tubes for your own restoration work.  Mouse over the photo images to zoom in. NO RESERVE!! Thanks for looking.