Rejuvinator risks?

jehuie

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Are there risks to using a rejuvinator on a monitor? Or should I just go nuts and rejuv anything I can get my grubby hands on?
 
I only "rejuve" monitors that clearly need it or have serious issues. If a monitor is pretty close to perfect I don't touch it.

I have a Sencore 7000 and the "rejuve" setting is the EXTREME setting and only used as a last resort. You'd want to use the lower and much safer "RESTORE" settings first. These settings are much lower risk and are pretty safe. I have yet to ruin a tube using these settings and have almost always been very pleased with the results. I assume the other rejuvers out there have similar safer settings.
 
As Blkdog7 said, don't go stupid, you can blow a monitor out, but if it looks like it needs it, it is worth it all the way. If the chassis needs rebuilding, rebuild it BEFORE you say "hmm I should rejuv that".
 
yes, you can kill a monitor. I killed a gun in a k7000. I was hitting a tube with a bad color. It was acting like it was close to finishing. then all of a sudden it dropped to zero.

Ever since then, I give it a 10 count on each gun. If its not clear by a 10 count, I go back to it in a few minutes. The one that I blew it took like a 20 count to die.

If the pic is not weak, then don't mess with it.

Right now I have a k4600 thats stuck on red(It worked great for about a day). It reads good with the rejuv except it lights up heater leakage. I think I read somthing about slight rasing heater voltage. Maybe that will help it.
 
Let's get the terminology right so we don't make mistakes....you are rejuvenating a TUBE - NOT a monitor.

pluschassis.jpg
 
Well yeah. It's like saying you fill up your car with gas. Everyone knows what you mean.

Not really - will you fill your car with 'gas' meaning a liquid at room temperature or 'gas' meaning a compressed GAS that is liquified? Calling petrol - gas, is pretty stupid.

In this case, better to call it a 'tube' that is being rejuvenated then there can be no misunderstanding....
 
Not really - will you fill your car with 'gas' meaning a liquid at room temperature or 'gas' meaning a compressed GAS that is liquified? Calling petrol - gas, is pretty stupid.

In this case, better to call it a 'tube' that is being rejuvenated then there can be no misunderstanding....

Is everyone in Australia crazy?
 
If in doubt, there is no harm in hooking up a rejevenator (spelling?) to test the guns in a picture tube.
 
If in doubt, there is no harm in hooking up a rejevenator (spelling?) to test the guns in a picture tube.

Strongly agree. I now do this before I think about working on a chassis. Nothing sucks more than spending an hour pulling the chassis, recapping, reinstalling, and seeing no improvement. Except maybe seeing things worse because you screwed up the repair job.

Test the tube first, that will point you in the correct direction to get the monitor looking 100%. Clean+balance or rejuve if it needs it, work on the chassis if things still aren't looking good.
 
Not really - will you fill your car with 'gas' meaning a liquid at room temperature or 'gas' meaning a compressed GAS that is liquified? Calling petrol - gas, is pretty stupid.

In this case, better to call it a 'tube' that is being rejuvenated then there can be no misunderstanding....

WHILE WE'RE AT IT what is with calling that damn PCB a "chassis?" The frame should be called the chassis, since: "A chassis (pron.: /ˈʃæsi/ or /ˈtʃæsi/; plural: "chassis") consists of an internal framework that supports a man-made object in its construction and use. It is analogous to an animal's skeleton."

The frame should be called the chassis, the chassis should be called the engine, and the tube should be called the zagometer.
 
WHILE WE'RE AT IT what is with calling that damn PCB a "chassis?" The frame should be called the chassis, since: "A chassis (pron.: /ˈʃæsi/ or /ˈtʃæsi/; plural: "chassis") consists of an internal framework that supports a man-made object in its construction and use. It is analogous to an animal's skeleton."

The frame should be called the chassis, the chassis should be called the engine, and the tube should be called the zagometer.

I think the term chassis comes from the olden days, when tvs as well as radios, used the whole metal frame, ie chassis, to mount all the electronic components onto.
There was no pcbs, just joining tags and wires
 
...and the tube should be called the zagometer.
Agreed!

As stated by others, there is no harm in hooking up a rejuvenator to check emissions - and it's a good idea to boot.

However; cleaning and balancing, and rejuvenating should only be used when deemed necessary by unacceptable gun emissions. Each gun's cathode is coated with only a set amount of emitting material at manufacture (which can vary greatly between manufacturers, models, and production batches.) Using the advanced functions of a rejuvenator overheats the cathodes to burn off contaminants - also burning away your unknown amount of remaining emitting material. Occasionally resulting in a "dead" gun - one which no longer has any material left to produce it's color.

Rejuvenating (and cleaning/balancing) shortens the life of your guns, and in turn, your tubes. Great when you need it, but don't go around jolting every tube.
 
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If I clean/balance or rejuv and I see blue sparks coming out of the gun, usually I just toss the tube because its on its way out.. even with rejuvenation
 
If I clean/balance or rejuv and I see blue sparks coming out of the gun, usually I just toss the tube because its on its way out.. even with rejuvenation

the blue sparks and flashes is the actual act of rejuvenating - it is the rejuvenator blowing away the cathode material that has flaked off the metal and created the short - if you see blue flashes chances are the rejuvenation will be sucessfull

If you are chucking away a tube that does this you may as well throw away your rejuvenator as well 'cause it isn't doing it for you.....
 
Rejuvenating (and cleaning/balancing) shortens the life of your guns, and in turn, your tubes. Great when you need it, but don't go around jolting every tube.

interesting cause i thought(actually heard from people) that only rejuv will hurt the tube....not the cleaning/balancing!

so both will shorten the life? but if it's a shot tube/gun anyway, what's the harm huh???
 
the blue sparks and flashes is the actual act of rejuvenating - it is the rejuvenator blowing away the cathode material that has flaked off the metal and created the short - if you see blue flashes chances are the rejuvenation will be sucessfull

If you are chucking away a tube that does this you may as well throw away your rejuvenator as well 'cause it isn't doing it for you.....

I dunno, usually when I get blue sparks rejuvenation results in an even lower emission (or an artifically high emission that decays very fast 30min-1hr) and the guns short together again shortly after..

I've had many tubes where they were low emission and i'd rejuv and i wouldn't get blue sparks.. and the result was a successful higher emission on the gun..

In my experience (about 20-35 tubes) blue sparks is usually the tube on its very last leg
 
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A rejuvenator is also a piece of test equipment. It is used to check the condition of the tubes internal elements. There is absolutely no harm done in testing things.

When actually doing a rejuvenation with a B & K brand, the "Clean & Balance" function is the weakest form of rejuvenation and will not hurt anything.
 
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