This sale has a vintage RCA Cunningham Radiotron #37 medium-mu triode radio tube.

It features a near complete upside down test label from a Brookline, Mass. music & radio shop.

 

The tubes tested with very good emission on my Eico model 666 Dynamic Conductance tester with no shorts or leakage.

On the meter percentage scale of 0-140, with a minimum of 80, this tube tested very good at 100.

Not tested for sound/noise quality in any type of equipment. No loose bases on any of my tubes.

PLEASE DO NOT HESITATE TO ASK ANY QUESTIONS YOU MAY HAVE ABOUT THIS ITEM. USE THE ZOOM FEATURE TO INSPECT ALL PHOTOS CAREFULLY. READ MY FEEDBACK AND BUY WITH THE CONFIDENCE THAT YOU WILL RECEIVE GREAT SERVICE.