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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Tue Apr 22, 2008 11:35 pm Post subject: My best televangelist impression... |
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HEAL this tube!
My newly acquired Sencore CR-70 just saved Chips' (stefuel's) P19LCP07 blue with low emissions and bad contrast, and near-mint phosphor.
The Emission Life Test is showing barely a tickle (about 1/8" movement.)
I've feel as if I've been touched by the noodly appendage of the Flying Spaghetti Monster! 
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Wed Apr 23, 2008 12:38 am Post subject: |
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What is the emmision life test and how does it judge it?
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Wed Apr 23, 2008 1:06 am Post subject: |
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What kind of Sencore are you refering to? A friend of mine just loaned me a Sencore CP 290 Color Analyzer.... and I haven't even opened the box yet but I'm guessing it's not for testing tubes.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Wed Apr 23, 2008 11:35 am Post subject: |
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| jkruger wrote: | | What kind of Sencore are you refering to? A friend of mine just loaned me a Sencore CP 290 Color Analyzer.... and I haven't even opened the box yet but I'm guessing it's not for testing tubes. |
Sencore CR-70. Here's a nice article featuring the newer model, the -7000
http://www.sencore.com/newsletter/Oct03/RejuveCRTs_files/RejuveCRTs.htm
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Wed Apr 23, 2008 11:41 am Post subject: |
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| stefuel wrote: | | What is the emmision life test and how does it judge it? |
The emission life test reduces filament voltage and allows the cathode to cool a little, then runs the emission test. If the emission slowly drops with a colder cathode, its' ability to spit electrons over the long term will be severely limited.
The amount of needle movement provides a very gross estimate of life: If the needle moves a lot, the gun can't emit at the lower temp and the expected life may be less than x months.
All in all, this is pretty gross and amounts to guesswork... BUT if the needle moves little or not at all with a colder cathode, it means that the cathode is healthy enough for years of service.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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