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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: El 84 only lights half way posted by lesleymorley@yahoo.com on March 4, 2014 at 05:53:10:
Hello!
If you're really not sure, fire them up, take some photos of the two tubes and the trouble spot, and post them.
It may just be the heater is little shorter, more "hidden" in its cathode. I think "technically" as long as the cathode is more or less uniformly glowing, heater length should not matter. If you see it's unevenly heated towards the top, I would be a little miffed. If it isn't, then no worries. The fact they work operate as expected is another indication that things should be fine.
There's been quite a lot of buzz about this issue lately: heaters that don't seem long enough, or are too long and nearly pop out the top of the cathode. Many power tubes I've bought lately have slight variations in heater wire length, including JJ 6CA7's and KT77's, and even New Sensor's Gold Lion KT77's.
Maybe someone can chime on this random question: longer heater, or an uneven thoriated tungsten coating, could mean more draw right?
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.
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Follow Ups
- RE: El 84 only lights half way - TubeAcolyte 07:21:09 03/04/14 (3)
- RE: El 84 only lights half way - Jim McShane 11:39:39 03/04/14 (2)
- RE: El 84 only lights half way - lesleymorley@yahoo.com 12:01:17 03/04/14 (1)
- Best way to allay those "lighting" fears. IMHO. - FenderLover 13:08:22 03/04/14 (0)
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