CurtPalme.com Home Theater Forum

jmetal88 · Joined: 06 Apr 2017 Posts: 108

I bought a Sony VPH-1271Q from a local seller and, while it's usable, the blue tube has poor focus and some visible burn-in. So I'm looking for a new or near-mint blue tube for the projector, as I don't think the one that's in there will be usable for too much longer.

I'd like to see pictures before committing to buying anything. For the ideal case (brand new, completely unused) I'd go up to $100 including shipping (to Derby KS 67037).

EDIT: On second thought, I don't think a used one in good shape would be too bad a deal at $100, either. Just let me know if you have something and hopefully we can come to an agreement!

Thanks!

Rattanee · Joined: 18 Jan 2015 Posts: 193

The blue tube is usually de-focused on CRT PJ-s intentionally. I'd think that's what you're seeing, I'd say only get a new tube if the burn is bad enough to bother you on-screen. (Since the blue is the lowest intensity, I found I could live with some amount of burn.)

Cheers

jmetal88 · Joined: 06 Apr 2017 Posts: 108

**Curt Palme** · Posted: Sun Apr 09, 2017 12:32 am Post subject:

Also pull the lens off the front of the set ( The power supply has to be loosened and pulled out to do this).

There's an air gap between the lens and the tube face on all tubes, and the HV section sits right by the blue tube. If the set has enough hours on it to wear the blue tube, then it most likely has pulled in some dust between the lens and the tube. Clean the back of the lens and the front of the tube, and I'll bet some defocusing and sharpness will come back.

The blue tube is defocused, but not ridiculously so. that's to get more brightness out of the blue tube as it's the dimmest. You generally defocus to get 20% more brightness out of the tube, and your eyes don't really see that the blue tube is defocused. If you're seeing halos around bright objects though, that's usually due to dust buildup. If the blue tube is bad, then do the red and green lenses too.

jmetal88 · Joined: 06 Apr 2017 Posts: 108

**Curt Palme** · Posted: Sun Apr 09, 2017 6:14 am Post subject:

I don't think I have anything left for tubes for the 12XX series, but I'll check when I'm back in town on Weds.

jmetal88 · Joined: 06 Apr 2017 Posts: 108

Cleaning the back of the lens assembly did help the focus. The dust was kind of caked on, though, so unfortunately the cleaning process left some hairline scratches in the lens, but considering they seem to affect the picture a lot less than the dust did, I'd say it was a good call to do the cleaning.

The red and green *may* benefit from the same procedure, but since they still look sharper than the post-cleaning blue, I'm reluctant to do so yet.

jmetal88 · Joined: 06 Apr 2017 Posts: 108

Incidentally, I took the time while the lens was off to compare my burn-in to your chart... Looking at the face of the tube, it about matches your picture for the 5, maybe approaching a 4. Functionally, it would seem to match more your description of a 6.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

I checked and I forgot that the box labels don't match the tubes inside.

What I have are SD-187s. Brand new, red, green, and blue.

I believe that the SD-187 is fully interchangeable with an 07M type.

Perhaps Curt can give you more authoritative details on that.

jmetal88 · Joined: 06 Apr 2017 Posts: 108

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Yeah, I think you're right. Only Sony would call an 8" tube an 07.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Here you go!

http://www.ebay.com/itm/BARCO-By-Sony-07MSP-B-BLUE-CRT-PROJECTOR-TUBE-/391501188324?hash=item5b274a0ce4:g:ax8AAOxyRhBS-pbY

The very thing you seek.

jmetal88 · Joined: 06 Apr 2017 Posts: 108

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

I have a few connections for surplus CRTs. I will see of any of them might have what you need.

jmetal88 · Joined: 06 Apr 2017 Posts: 108

jmetal88 · Joined: 06 Apr 2017 Posts: 108

jmetal88 · Joined: 06 Apr 2017 Posts: 108

Alright, I'm fairly sure I'm not getting a new blue tube for this for quite some time (maybe even long enough that a full projector upgrade will be an option by then), so I'm attempting the 'wear evening' described on Curt's website. I have my laptop hooked up and drew some polygons on a full-screen Inkscape canvas to mask out the already burned-in area so I can hopefully get the rest of the tube to match. That doesn't do anything to help the focus, of course, but I'll definitely be happier with this projector if the colors are more even.

jmetal88 · Joined: 06 Apr 2017 Posts: 108

I just discovered that I actually have a VPH-1272Q, not a VPH-1271Q, so the 07MSP would actually be the correct tube. Although I've pretty much learned to live with the burn-in by now. I am not sure how I never noticed until now that the number printed on my projector doesn't actually match the number printed on my manual. xD

**Curt Palme** · Posted: Tue Oct 10, 2017 3:29 pm Post subject:

Either tube will work, although the MSP may be a bit sharper . THe focus voltage between the tubes is different, so you`ll have to adjust the focus pot to get proper focusing.

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

Hi,
My old Sony has a very low wear blue 07msp, but it unfortunately has a spot burn line in the middle. I didn't find it that distracting as it's blue, but spot burn is still a damned thing. I'd be willing to give it out super cheap if interested.

I also have old spare 07mp but I don't think it'd be much of an improvement to your current one haha.

Cheers
Eemil