Mystery Tube

[Dennis Norton]

Hi Gang--time to crank up the craniums for a round of stump the list.

I have an old RCA tube-octal base, metal casing 1 1/4 diameter, 3 1/2 inches tall. The number on it is 913 and a date code?? is 3-17. The other markings are "RCA radiotron electron tube". The top of the tube is glass and makes you want to think it is a green eye tube....however--instead of being able to see the metal part that would glow green, the glass is inside coated with white. Looks kind of like a little CRT.

I have scoured all of my tube charts and technical stuff from the beginning of time (almost) and cannot find any reference to a # 913 tube.

Any one have a clue??   Thanks.....Dennis Norton    W2DJN

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://interactive.tempe.gov/archives/HEATH.html