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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: Mullard Blackburn date code B7H2 posted by Marshall George on March 23, 2006 at 06:50:03:
Yeah, "I63" could be either, and neither would have copper grid rods. What's printed on the tube could also be definitive, especially other date codes, but the main constructional difference will be: look at the metal rod that holds up the halo. If it's straight, with the rim of the halo welded perpendicular to it, it's '67. If the rod is bent at a right angle and the halo is welded parallel to that, it's later. The halo is typically positioned closer to the top mica on the '70s too, but that's less specific.Jeff
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Follow Ups
- Re: Mullard Blackburn date code B7H2 - Jeff A W 16:35:54 03/24/06 (2)
- Re: Mullard Blackburn date code B7H2 - Jeff A W 05:30:34 03/25/06 (0)
- Re: Mullard Blackburn date code B7H2 - Marshall George 18:11:57 03/28/06 (0)
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