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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Jul 30, 2009 6:13 pm Post subject: SCORE! |
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Just got myself a Sencore 7000. Stupid thing was, I wasn't even looking for one...
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Jul 30, 2009 7:02 pm Post subject: |
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I was hesitant in bidding as things have slowed down a bit, and heck, with 104 degree weather here, us Vancouverites are dead slow in getting things done as well. But, at that price... I had to have it.
I will do a full report to see how it works on dead tubes. I've been saving some here with low emission just in case I ever got one of these units.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Thu Jul 30, 2009 7:16 pm Post subject: |
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Sin up for a Sencore FTP account. They have an online database of tube parameters thats' far more up to date than the published books.
_________________
"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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CRT_Ben
Joined: 28 Aug 2006
Posts: 1684
Location: Northern Virginia
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| Posted: Thu Jul 30, 2009 7:22 pm Post subject: |
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How do the different Sencores stack up? I've always wanted to get one to try juicing some dead tubes but I don't know what I need.
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Kiev Savoie
Joined: 25 Oct 2007
Posts: 432
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| Posted: Thu Jul 30, 2009 7:28 pm Post subject: |
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So what can you do with one anyway? some sort of testing device right?
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Thu Jul 30, 2009 7:32 pm Post subject: |
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CR-70 (which I've got) and CR-7000 are CRT rejuvenators... They allow you to selectively overheat the cathode heater and over-current the cathode in order to cook off contamination. They typically also are able to discharge a capacitor thru the cathode, heater, or grids in order to blast a short circuit.
My CR-70 has proven able to save seven of the nine tubes I've used it on.
_________________
"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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CRT_Ben
Joined: 28 Aug 2006
Posts: 1684
Location: Northern Virginia
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| Posted: Thu Jul 30, 2009 7:37 pm Post subject: |
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| Heywood Jablome wrote: | CR-70 (which I've got) and CR-7000 are CRT rejuvenators... They allow you to selectively overheat the cathode heater and over-current the cathode in order to cook off contamination. They typically also are able to discharge a capacitor thru the cathode, heater, or grids in order to blast a short circuit.
My CR-70 has proven able to save seven of the nine tubes I've used it on. |
Good info - I take it that they could probably do nothing for the common Marquee tube fried by heater overvoltage?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Jul 30, 2009 8:10 pm Post subject: |
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THat's what I want to find out. I've had several B&K testers, and while they worked great for most CRT TV tubes, I never got one to work properly with projection tubes. A Heathkit one that a buddy built years ago didn't work nearly as well as the B&K, and the 7000 is supposed to be the cat's ass over any other tester. There's one more 'cheapie' on eBay right now, and two that people want the $1500+ for that these normally sell for.
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Kiev Savoie
Joined: 25 Oct 2007
Posts: 432
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| Posted: Thu Jul 30, 2009 10:27 pm Post subject: |
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[quote="Heywood Jablome"]CR-70 (which I've got) and CR-7000 are CRT rejuvenators... They allow you to selectively overheat the cathode heater and over-current the cathode in order to cook off contamination. They typically also are able to discharge a capacitor thru the cathode, heater, or grids in order to blast a short circuit.
My CR-70 has proven able to save seven of the nine tubes I've used it on.[/quote]
So you can take a tube that rates at 5 or 6 and get it up to 8 or 9 again with this equipment?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Jul 30, 2009 10:59 pm Post subject: |
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No, rating a tube at a 5 or 6 has to do with phosphor wear. We're only talking about emission here.
In other words (I think/hope) that a tube that needs a G2 setting of 80 on a Marquee should be able to drop down to a 'normal' 60-65 or so. If the phosphor is worn, nothing short of a new tube will repair that.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Thu Jul 30, 2009 11:12 pm Post subject: Re: SCORE! |
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| Curt Palme wrote: | | Just got myself a Sencore 7000. Stupid thing was, I wasn't even looking for one... |
It should be interesting to see what you think but you will need the universal adapter with color coded and labeled pins or make your own adapter depending on the tube type.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Thu Jul 30, 2009 11:19 pm Post subject: |
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BTW I got mine as a buy it now for $325 after being listed for 20 minutes on flea bay 
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Thu Jul 30, 2009 11:25 pm Post subject: |
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| Curt Palme wrote: | | In other words (I think/hope) that a tube that needs a G2 setting of 80 on a Marquee should be able to drop down to a 'normal' 60-65 or so. |
Really?? I thought "cooked" cathodes were just worn out, whereas rejuvenators like the Sencore were more for burning off some kind of impurities on the cathode.
So this might be able to resurrect P14-cooked tubes?
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Thu Jul 30, 2009 11:53 pm Post subject: |
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The rejuvenator can make tubes with secondary emmisions (won't cut-off to black) work right again.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Fri Jul 31, 2009 12:34 am Post subject: |
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| CRT_Ben wrote: |
Good info - I take it that they could probably do nothing for the common Marquee tube fried by heater overvoltage? |
Unlikely; the problem stems from a plating boiled off the cathode, but no harm in trying one.
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Fri Jul 31, 2009 12:37 am Post subject: |
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Curt said "score" and I thought the forty year old virgin got laid 
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Jul 31, 2009 12:37 am Post subject: |
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Tom- mine comes with the clip lead universal adapter, so I should be able to do any tube. At least I'm not hte only one that got a good deal....WE SUCK!
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then I'll call ya a bastage!!!!!
