CurtPalme.com Home Theater Forum

**Curt Palme** · Posted: Tue May 11, 2010 11:50 pm Post subject: Sony G70 tube wear

For those that don't believe that G70s can wear tubes quickly, just got this sent to me from Australia, from a 560 hour set. I don't know how it was run, settings, etc, but the comment from the customer was:

'it only has 560 hours on it, so the tubes are clean'

Umm, sorry, no they are not. Shocked

Kiev Savoie · Joined: 25 Oct 2007 Posts: 432

Yup, that's about what one of mine looked like as well. only 900 hours. I think it was Craig that mentioned these units were built for performance NOT tube longevity. Sony must have made a killing selling replacement tubes to corporate and military clients.

ecrabb · Posted: Wed May 12, 2010 1:16 am Post subject:

Curt, is that wear on the green or blue tube? The outside area looks green, like you're pushing green to compensate. Maybe it's just the camera...

Don't forget to consider how the projector was used... i.e., I could see how a blue Windows desktop at contrast 80 might wear the blue tube the same in 560 hours that normal video at contrast 70 might wear the same tube in 1500 hours.

SC

Mark_A_W · Posted: Wed May 12, 2010 1:57 am Post subject: Re: Sony G70 tube wear

Mark_A_W · Posted: Wed May 12, 2010 1:58 am Post subject:

Oh, and STOP STEALING OUR FRIGGIN G70'S!!!!

**Curt Palme** · Posted: Wed May 12, 2010 2:15 am Post subject:

No, I meant the PICTURE was sent to me <grin>

The virgin phosphor is at the bottom of the pix, so yes, it's green wear.

Mark_A_W · Posted: Wed May 12, 2010 2:22 am Post subject:

It's possible it's a camera artifact, but yes, it does look like wear.

**Curt Palme** · Posted: Wed May 12, 2010 2:41 am Post subject:

He emailed me the pix, asking how to get rid of the green band across the bottom..

ecrabb · Posted: Wed May 12, 2010 2:54 am Post subject:

That's pretty weird to have that much green wear before blue wear, though... Was the guy watching a lot of golf? Wink

SC

**Curt Palme** · Posted: Wed May 12, 2010 3:41 am Post subject:

I don't know the application. In EM focusing sets, the green always wears faster than the blue.

ecrabb · Posted: Wed May 12, 2010 3:46 am Post subject:

Why would that be, Curt?

SC

**Curt Palme** · Posted: Wed May 12, 2010 4:07 am Post subject:

I don't know, this question has been asked a number of times on avs with no real answer(s).

ecrabb · Posted: Wed May 12, 2010 8:20 am Post subject:

I can't see how EM would have any impact whatsoever on wear... I would assume a color-filtered machine drives the green a bit harder and therefore wears it faster than would a non-filtered machine (to achieve the same brightness).

SC

roland@b4 · Joined: 07 Jul 2009 Posts: 82 Location: Reading UK

Tube run times can be reset so easily on a G70
Some people look like they do it every 20hrs or so

Mark_A_W · Posted: Wed May 12, 2010 11:03 am Post subject:

**Curt Palme** · Posted: Wed May 12, 2010 3:41 pm Post subject:

That doesn't explain why the blue tube wears first on the ES focusing sets though..

ecrabb · Posted: Wed May 12, 2010 5:31 pm Post subject:

**Curt Palme** · Posted: Wed May 12, 2010 6:29 pm Post subject:

Sets like Barco aren't filtered anything, so that blows that theory up. Smile

Kiev Savoie · Joined: 25 Oct 2007 Posts: 432

I would think wear leveling would be well worth a shot with such a low hour tube though. What do they go for rebuilt now?

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

Maybe the phosphors have different wear rates.