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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Nice try ;-) posted by dave slagle on August 29, 2012 at 18:00:24:
That your 304TL switches when the DC filament supply polarity flips makes sense because these are physically 2 complete vacuum tubes in one envelope with different potentials. The bias is obviously affected.
A single element tube like the 75TL tells me that the cathode does not heat at the same rate over its entire surface. In fact, it is physically impossible for it to do so. Also, the materials are not 99.999999999999% perfect so there is going to be some additional variability.
The emissions from any point on the cathode will be most strongly attracted by the part of the plate with the closest physical proximity. So if point A on the cathode has higher emissions during warm-up or even operation, the corresponding point B on the plate that is closest will have a higher temperature due to increase current. This is why misaligned tubes result in hot spots on the plate.
They sound really good, none the less.
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Follow Ups
- "What does this tell you?" - Chris O 08:07:52 08/30/12 (5)
- RE: "What does this tell you?" - dave slagle 08:47:20 08/30/12 (4)
- RE: "What does this tell you?" - Chris O 12:58:46 08/30/12 (3)
- RE: "What does this tell you?" - dave slagle 13:43:18 08/30/12 (2)
- RE: "What does this tell you?" - coffee-phil 08:38:50 09/08/12 (0)
- Then I guess you convinced me. (nt) - Chris O 14:24:55 08/30/12 (0)
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