I have a Tube that I can't find any info on. It's a small octall based Tube with an extra top connection. It looks to be a twin tube. It may be a twin triode by the look of the insides. Has the number in a square box, on base SC278A. Date code is K3E also marked as made on USA. The tube - valve looks un used as is very clean. I don't have its box.
The only tube that I found that comes up for this number has a metal outer.
My one has a glass envelope as per most valves.
The total height is 4 1/8 inch diameter of glass envelope is 1 1/8 inch
Base has the central location peg with key.
Any one come across one like this and know what it is?
Thanks
The only tube that I found that comes up for this number has a metal outer.
My one has a glass envelope as per most valves.
The total height is 4 1/8 inch diameter of glass envelope is 1 1/8 inch
Base has the central location peg with key.
Any one come across one like this and know what it is?
Thanks
SC278 should be a CRT 16 inches long.
The most likely two-top-cap octal is 815 / VT-287, used in a bunch of Ampex:
Or does "extra" mean one top cap? There's a ton of small octals with one top cap, from ever-popular 6J7 to 6F8 to many duo-diode-triodes. Many of these started as Metal and transition to Glass, not always with the "G" suffix.
If you like caps, look at RCA 8025
https://www.tubeworld.com/8025nos.jpg
About $10 a cap.
The most likely two-top-cap octal is 815 / VT-287, used in a bunch of Ampex:
Or does "extra" mean one top cap? There's a ton of small octals with one top cap, from ever-popular 6J7 to 6F8 to many duo-diode-triodes. Many of these started as Metal and transition to Glass, not always with the "G" suffix.
If you like caps, look at RCA 8025
https://www.tubeworld.com/8025nos.jpg
About $10 a cap.
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Could it be similar to this?
One(1)NOS vintage Bendix JAN CRC 12SG7 VT209 vaccum tube SC278A. US army 1942 | eBay
or this?
CV 278, Tube CV278; Röhre CV 278 ID28324, Double Triode
One(1)NOS vintage Bendix JAN CRC 12SG7 VT209 vaccum tube SC278A. US army 1942 | eBay
or this?
CV 278, Tube CV278; Röhre CV 278 ID28324, Double Triode
Perhaps SC278A is the US Army contract with RCA? It seems to appear on lots of RCA military tubes.
'Made in USA' may mean nothing, as lies were often told about country of origin.
K3E could be a Philips factory/date code, but the latest code list I have mentions K as a factory code but doesn't know what it means. Maybe K means RCA?
'Made in USA' may mean nothing, as lies were often told about country of origin.
K3E could be a Philips factory/date code, but the latest code list I have mentions K as a factory code but doesn't know what it means. Maybe K means RCA?
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