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Sony VPH G70 questions

 
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ElTopo



Joined: 07 Nov 2006
Posts: 1242



PostLink    Posted: Sat Feb 11, 2017 1:22 pm    Post subject: Sony VPH G70 questions Reply with quote


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Hi all,

does the G70 have the same issues with the dallas chip as the G90 ?


cheers
ElTopo

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Barco Cine9


Last edited by ElTopo on Mon Mar 06, 2017 5:40 pm; edited 1 time in total
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cmjohnson



Joined: 03 Apr 2006
Posts: 3867
Location: Flori-DUH

TV/Projector: Marquees, G90s, JVC RS45


PostLink    Posted: Sat Feb 11, 2017 2:21 pm    Post subject: Reply with quote

No, the G70 does not use a Dallas chip.
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ElTopo



Joined: 07 Nov 2006
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PostLink    Posted: Sun Feb 12, 2017 10:04 am    Post subject: Reply with quote

Thanks.

@all: Are these good and reliable beasts ?


ElTopo

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cmjohnson



Joined: 03 Apr 2006
Posts: 3867
Location: Flori-DUH

TV/Projector: Marquees, G90s, JVC RS45


PostLink    Posted: Sun Feb 12, 2017 4:38 pm    Post subject: Reply with quote

By all accounts, yes. They have some issues with convergence board failures but Curt can fix those.

The big issue is that there are no known sources for replacement tubes for them. P16LJE types.

When they're worn out, that's the end. Unless you want to convert the chassis over to run entirely different tubes.

This tube type has a thinner neck than most other tubes so you can't even put a different tube in and keep the same magnetics.

Changing over a G70 to run different tubes would require finding tubes, making neck board adapters, maybe modifying the neck boards as well, and finding compatible magnetics as well.

So if you buy a G70, tube condition is EVERYTHING. What you get is all you will ever get short of major re-engineering of the
unit to run different tubes.

If you did want to go in that direction, I'd choose Marquee 8520 LC hardware for the tube swap. I think it'd be easier to adapt that to mount in the G70 than anything else.
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draganm



Joined: 08 Mar 2006
Posts: 8182
Location: Colorado


PostLink    Posted: Sun Feb 12, 2017 7:33 pm    Post subject: Reply with quote

ElTopo wrote:
Thanks.

@all: Are these good and reliable beasts ?


ElTopo
honestly IMO, no they're not, you really should start with 3 working G70's in order to keep 1 going for a reasonable length of time,
recent example

http://www.curtpalme.com/forum/viewtopic.php?t=39450&highlight=

cmjohnson wrote:
By all accounts, yes. They have some issues with convergence board failures but Curt can fix those.
.
based on my experience, add PA boards, video input, and deflection to list of "common failures"
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jbltecnicspro



Joined: 23 Apr 2016
Posts: 226



PostLink    Posted: Sun Feb 12, 2017 7:57 pm    Post subject: Reply with quote

Lol! I was wondering if I was the recent example and sure enough I was. Badge of honor? Very Happy
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cmjohnson



Joined: 03 Apr 2006
Posts: 3867
Location: Flori-DUH

TV/Projector: Marquees, G90s, JVC RS45


PostLink    Posted: Sun Feb 12, 2017 8:23 pm    Post subject: Reply with quote

But then again, I know G70 owners who've had them for years and never had any trouble at all.

I think it is fair to note that all electronics will reach the point at which something will start to fail.
Most CRT projectors have reached that age where you can expect their reliability to be dropping.


But to be fair about it, most CRT projectors should be pretty close to trouble free for at least the first ten years
after they're built, which is longer than the expected life of MOST forms of consumer electronics.

I would encourage a G70 buyer to acquire a second unit for spare parts. I'd encourage any CRT projector owner to do the same.
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ElTopo



Joined: 07 Nov 2006
Posts: 1242



PostLink    Posted: Mon Feb 13, 2017 8:06 am    Post subject: Reply with quote

Any chance to find out the manufacturing date inside the menu of the G70 ?
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draganm



Joined: 08 Mar 2006
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Location: Colorado


PostLink    Posted: Tue Feb 14, 2017 10:31 pm    Post subject: Reply with quote

jbltecnicspro wrote:
Lol! I was wondering if I was the recent example and sure enough I was. Badge of honor? Very Happy
Thumbs Up fame and fortune soon to follow

ElTopo wrote:
Any chance to find out the manufacturing date inside the menu of the G70 ?
from memroy, small badge on side next to lifting handles with DOM and model number. I seem to recall these were like 1997 to 1999 or maybe 2000?
Ideally, you want a G70VR or find a set of VR lenses somewhere

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ElTopo



Joined: 07 Nov 2006
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PostLink    Posted: Wed Feb 15, 2017 3:16 pm    Post subject: Reply with quote

Are the HD-134 so much better ?
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gjaky



Joined: 05 Jun 2010
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Location: Budapest, Hungary


PostLink    Posted: Wed Feb 15, 2017 7:53 pm    Post subject: Reply with quote

ElTopo wrote:
Are the HD-134 so much better ?


They say...

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jbltecnicspro



Joined: 23 Apr 2016
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PostLink    Posted: Wed Feb 15, 2017 10:13 pm    Post subject: Reply with quote

ElTopo wrote:
Are the HD-134 so much better ?


If you google for CurtPalme G70 Owner's thread, you'll find that thread and then you'll find a link to another thread of someone who obtained one and had ChadB calibrate it. According to ChadB, it's the sharpest G70 he's ever seen.

In my opinion, though it probably is a hell of a G70, a good 9-incher would still beat it.
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Cravendale



Joined: 15 Feb 2017
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PostLink    Posted: Fri Feb 17, 2017 7:42 am    Post subject: Reply with quote

What chip does it use?
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cmjohnson



Joined: 03 Apr 2006
Posts: 3867
Location: Flori-DUH

TV/Projector: Marquees, G90s, JVC RS45


PostLink    Posted: Fri Feb 17, 2017 11:40 am    Post subject: Reply with quote

It doesn't use any kind of a battery backed up memory chip like a G90. It uses eeproms that retain their data with power completely disconnected.
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ElTopo



Joined: 07 Nov 2006
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PostLink    Posted: Mon Feb 27, 2017 12:01 pm    Post subject: Reply with quote

How loud is the G70 after a fan mod?
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jbltecnicspro



Joined: 23 Apr 2016
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PostLink    Posted: Mon Feb 27, 2017 12:21 pm    Post subject: Reply with quote

I don't know. Personal opinion, so you can take it or leave it - unless your mod isn't decreasing airflow, I would leave the fans alone. The G70 is thermally challenged enough as it is, especially when hung from a ceiling. My two cents.

If it's possible to actually increase the airflow while making it quieter, then I would say go for it. But only if you can verify this.
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AFryia



Joined: 09 Mar 2006
Posts: 884
Location: S.E. Michigan VPH-G70Q


PostLink    Posted: Tue Feb 28, 2017 12:22 am    Post subject: Reply with quote

ElTopo wrote:
How loud is the G70 after a fan mod?
Better but not good enough IMO. I cut out the cage got a few db. I stopped short of changing fans because of reported issues of insufficient static pressure.

I went hush box and I kicked myself for not doing it sooner. I now measure ~25-26 db @ 1M.

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ElTopo



Joined: 07 Nov 2006
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PostLink    Posted: Mon Mar 06, 2017 5:39 pm    Post subject: Reply with quote

Are the colored c-elements be usable in another projector ?
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
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PostLink    Posted: Mon Mar 06, 2017 5:50 pm    Post subject: Reply with quote

NEC XGLCs
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gjaky



Joined: 05 Jun 2010
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PostLink    Posted: Mon Mar 06, 2017 5:54 pm    Post subject: Reply with quote

Barco 808LC owners also like those along with the lenses instead of HD117
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