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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Mar 16, 2011 1:47 pm Post subject: Barco neck cards and G-2 |
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Barco CRTs usually (always?) have G-2 connected on pin 6.
Some CRTs have G-2 connected on pin 2.
If one connected pin 2 of a non Barco tube to pin 6 to allow use of the non Barco tube in a Barco projector would the fact that G-2 voltage being on pin 2 cause a problem?
Is pin 2 connected to anything on barco neck cards?
TIA for the help,
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Mar 16, 2011 3:40 pm Post subject: |
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Nope, I've done it with no problems.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Mar 16, 2011 3:44 pm Post subject: |
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AFAIK, this is done all the time. MArquee tubes in a Barco and vice versa. Pin 2 on a Barco is open as is pin 6 on marquee tubes. I have installed one Barco 180DVB in a MArquee and jumped 2 to 6 by moving White bias wire. You do the opposite for MArquee tubes in a Barco.
Lets have some Barco guys confirm .
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Mar 16, 2011 3:44 pm Post subject: |
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Thanks, Curt. You're a gentleman and a scholar.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Mar 16, 2011 3:51 pm Post subject: |
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Draganm, we posted at the same time.
You have to watch-out when connecting G-2 to pin six on a Marquee neck card as there is a few hundred k ohm resistor (if a non LUG neck card) to ground there. It will load the Marquee G-2 circuit and potentially not allow the voltage to go high enough.
It seems that isn't the case with the Barco neck card as pin 2 must be open circuit. Curt sez no problem there.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Mar 16, 2011 4:06 pm Post subject: Re: Barco neck cards and G-2 |
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| tse wrote: | | Barco CRTs usually (always?) have G-2 connected on pin 6. |
Only Mec tubed Barcos I think.
| tse wrote: | | Is pin 2 connected to anything on barco neck cards? |
Most unused pins are tied to ground, in some models that is also case with pin2. For example in 1208 it's connected to ground.
If I remember correct it was same thing with my BG808s neck boards (originally Sony tubes).
So it's good to check first.
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Mar 16, 2011 5:50 pm Post subject: |
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Oh, oh. Is it that some Barco neck cards have pin 2 grounded and other Barco models don't? I don't know which projector these tubes are going in other than Barco.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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