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Some pics, Never played it as only have one. Top mica is reminiscent of Euro type construction with clear sheet over cathodes. Tube is labeled canada 12AX7, 7025. Yes it is a black long plate. Side ring getter. silver inside plate lining is visible.
Perhaps canadian rogers?
Follow Ups:
Stu:
I have several of those tubes, some marked Canada 7025 like yours, others marked Baldwin 6681. I even have a pair labeled Westinghouse. Clear top, black plates, side getter. I believe they are RCA, but made in a Canadian plant. Appear to be for industrial use.
In my amp they are a very good sounding tube, if not quite the cream of the crop. Similar to the RCA blackplate 12ax7 from the late 50s/early 60s with a little less resolution maybe.
If you need another one to try them, pm me and I can get one out to you.
Mendel
Edits: 06/27/14
I have a specimen like this. I could never really identify it for certain. By my research, it is claimed to be an RCA-Canada product. This seems kind of reasonable given the plate style and carbon coating (very similar to early RCA tubes). RCA had the clear top 12AU7, so a side-getter variant of a 12AX7 wouldn't be THAT crazy.If it's an RCA tube, why are there no RCA markings? I know manufacturer and product brand shenanigans were in full swing by the 60s. Maybe it's a thing of politics regarding domestic manufacturing and consumption? Would 1950-60s RCA have had trouble manufacturing something elsewhere (Canada, Mexico, whatever) and selling it in the US? If did they contract out their tooling and expertise, could they sell these tubes ONLY in Canada? Maybe it's a thing of standards? Fear of contaminating the market with copies or frauds (hence such a different looking 12ax7)? Or is it just plain monopolization (more money to make when your demand is divided by a national border)?
Can anyone comments on my stab at this? I'm not very familiar with economic policies of the day with respect to these things...
(edit: small mistake)
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May your tubes be lively and long-lasting. Holy be thy heater.
Edits: 06/25/14
Back in the day tubes were fungible and re-labeling was common practice. You can go nuts trying to figure it out.
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