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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Tubes - Sylvania 12ax7 vs 5751 3 mica blackplates posted by 4kids on October 6, 2004 at 00:03:18:
Cross marking/branding is remotely possible - but very remotely. A Sylvania black plate 12AX7 is an entirely different tube than the Sylvania blackplate 5751. Bambi covered it well. It can be difficult to tell the difference between some REALLY early GEs and Sylvania black plate, triple mica 5751s. The internals look very similar, the etched tube type marking looks the same. We're talking about an early period where it seems that GE didn't also etch those tell-tale dot patterns on the tube along with the type. Both are nice sounding tubes, I think, with the Sylvania being the better of the two, but I still wouldn't expect to pay as much for the GE.I have some GB-branded Sylvania triple mica black plate 5751s. None have gold pins. I believe the gold pins were reserved for the later gray plate types, both triple and double mica flavors. Not all GBs of any type had gold pins.
The Sylvania 5751 black plate three mica tube is excellent. So is the triple mica gray plate Sylvania 5751, too. I'm not sure which I like better. There're two gray plate variants I've seen. One type with two crimps one side of the plates, and one on the other; and another type with one crimp on either side of the plates. They're both excellent, but the one of myth and legend is the fomer type.
It pays, I think, to not worry so much about the branding - GB, military, other. Just worry about the construction and the performance of the tube. If you're clever enough to spot an unmarked triple mica Sylvania 5751 from its construction you can sometimes pick up essentially the same tube as the ones wearing more vaunted branding for much less money. Definitely a tube to seek.
- SJ
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Follow Ups
- Re: Tubes - Sylvania 12ax7 vs 5751 3 mica blackplates - tvr2500m 18:56:29 10/06/04 (1)
- Tubes - Sylvania 12ax7 vs 5751 3 mica blackplates - 4kids 20:25:55 10/06/04 (0)
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