CurtPalme.com Home Theater sales, calibration, service, and discussion forum. Hundreds of free manuals & setup tips.
   


 
Sign up and receive the latest newsletters by email!     Join the Forum discussions!    
    Site Map  
Home Products
For Sale
Referral
List
Photo
Gallery
Links Contact
Us
CRT Primer
Troubleshooting Tips
Mounting Methods
Definitive CRT
Projector Setup Guide
Tube/Raster Setup
Advanced Procedures
Projector
Specifications
Projector Rankings
Video Processors
Ampro 1500/2000
Ampro 2300/2600
Ampro 3600/4600
Barco (Older Analog)
Barco 70x/Cine7  
Barco 500/800/801
Barco 808/Cine8
Barco 120x/Cine9
Dwin 500/700
Electrohome ECP 
Electrohome Marquee 
Mitsubishi
NEC PG
NEC XG
Panasonic 108x
Runco
Seleco
Sony 10xx
Sony 125x/127x
Sony 1292
Sony D50
Sony G70
Sony G90
Zenith 841/851
Zenith 895/900
Zenith 1200


Tube Condition (Wear)

      >> Basic Information  
      >> What Uneven Tube Wear Looks Like On-Screen  
      >> Example of a Poorly Installed Set  
      >> Tube Wear Rating Chart 


Tube Wear Rating Chart


 



Over the years the following CRT tube wear rating chart has been adopted by enthusiasts to better describe the condition of tubes.

Keep in mind that tube wear is very subjective. I've seen sports bars use tubes that are rated at a '4' or less and they still consider them to give a good picture. On the other hand, I've seen customers replace tubes at an '8' condition due to the belief that the tubes were worn beyond use.

While this chart can be considered a reasonable guide to Tube Condition (Wear), the actual picture quality can only be judged accurately by yourself once the projector is fully set up and aligned.

Rating Description Action Example
10 New  None needed.
Very usable as is.

Estimated Life: 10,000+ hours

9 Used but in new condition. None needed.
Very usable as is.

Estimated Life: 10,000+ hours

8 Light usage - faint signs of wear.  None needed.
Very usable as is.

Estimated Life: 7,500-9,000+ hours

7 Low usage - slightly heavier definition of previous display on face of tube. None needed unless is it not possible to remain within the same phosphor usage area as the previous installation (ex: switching from a 16:9 to a 4:3 screen). In this case, the uneven wear will show whites as slightly yellow (if the blue tube is the culprit). This can be reduced by bumping up the output of the blue tube which will in turn shorten the life of the tube.

Estimated Life: 6,000-8,000+ hours

6 Moderate usage - Browning or burn on the face of the tubes readily identifiable. Color balance may become an issue. None needed unless it is not possible to remain within the same phosphor usage area as the previous installation (ex: switching from a 16:9 to a 4:3 screen). In this case, the uneven wear will show whites as yellow in an uneven pattern (if the blue tube is the culprit). This can be reduced by bumping up the output of the blue tube which will in turn shorten the life of the tube.

Estimated Life: 4,000-6,000+ hours

5 Medium usage - Browning is fairly obvious and you are starting to wonder why blue skies tend to be gray (if the blue tube is the one with the wear). It's time to start pricing used or new tubes depending upon how many hours you put on your projector. With infrequent use, these tubes will last a long time.
4 Burn Minimally useable, fine for gaming and non-critical viewing where colour balance is not important.
 
3 Heavy burn Should be replaced.
2 Very heavy burn Should be replaced.
1 Computer burn / Uneven burn / Deflection burn Should be replaced.
Did you find this information useful? Please consider making a donation to help defray the cost of managing and hosting future articles, tips, and documents.     


Or purchase from Amazon.com and a small percentage automatically goes to support this site at no extra cost to you! Visit their Blu-ray and DVD stores for sales. Want to show off your home theater? See our Blu-ray Release List & Must-Have Titles. Shop at Amazon.com and support our site!


Back to Page 1


 
   Copyright 2004-2013 Curt Palme. All Rights Reserved.