I have a slew of old tubes laying around the house that I've gathered up from multiple yard sales and thrift markets. Here are just a few I'm curious about: #1: 12AX7 labeled Webcor and Made in Great Britain. Has four creases in the dome of the tube. #2: Webcor 12AX7 with 12AX7 in octagonal logo. Smoking on side of glass. #3: 12AX7 that came in an RCA box. May not be the original box. #4: 6BQ5/EL84... black plates... Mytron labeled. #5: Motorola labeled 5881. Red base.