Tubes Asylum

Weird looking RCA 6SN7

67.170.39.251

Hello to all!

I need some help here. I recently came into possession of a pair of RCA tubes that I believe are 6SN7 tubes, but they do not have the typical flat plates that I am used to seeing from tubes of this era. I usually see staggered black plates ("blackplates") and a bottom "D" shaped getter. These have round plates. Same bottom getter, and from what I can tell holding one with rounds plates next to the more common black (and staggered) plated tube, the internal wiring seems to be the same. Of course, the glass is perfectly clear, and there is no markings on the tube anywhere to indicate if it is NOT a 6SN7. Could this be a 6SL7? The code on the base is simply 1-13 (1951 - 13th week?) The base is black with silver lettering. The glass envelope is 1.5 inches. The micas are rather oblong - rounded at the ends and straight along the edges. That is about the best description I can give. I can photograph one and send the photo (digital) to anyone who needs to see it so as to aid in the identification. As mentioned, I have never seen RCA 6SN7's like these before.

Thanks for all the help in advance.

Follow Ups:

RE: Weird looking RCA 6SN7 - Len_ 15:41:48 05/27/07 (1)
- RE I found them - Mechans 05:07:13 05/31/07 (0)
RE: Weird looking RCA 6SN7 - Tom Bavis 08:14:20 05/27/07 (0)
RE:! Ping.Len ! 6SN7 - Mechans 05:13:35 05/27/07 (0)
RE: Weird looking RCA 6SN7 - benie 02:15:43 05/27/07 (0)

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