CurtPalme.com Home Theater Forum

[Nashou66]

Mike here are the data sheet pics.





What can you get from theses mike? I can ask Aferg what Voltage the Triton 1080HD projector used for the HV supply value.
But like I said before he did mix and match Lug's and thomas tubes in that Projector.... so can LUG's take 40KV?

Athanasios

[Nashou66]

Ok you say they bloom at 60, I notice the same with the regular LCP's maybe closer to 63, but witht he franken yokes i got better results with the LCPs
I was able to go to 70 with no blooming and about 75 where it began to be noticable. But i did not see Bens focus problems. But i also did not check
on a screen jsut on the tube face wearing sunglasses at a contrast of 50 and they were just as sharp as the LCP red i was comparing it to in the same PJ.
I cant go recheck now as I took that tube apart to give Dale the bellow from it. But i will be willing to try the HV test on a used Thomas tube i
have(have about 9 ). Mike is there any issue to the VNB's with the extra 5Kv?

Athanasios

[Nashou66]

Ok I got this email back from Aferg, i was wrong about mixing and matching tubes... I couldn't remember
exactly , they just used a VNB that had jumpers depending on what tube set that PJ had, but he said you could mix and match if you want to(that was a question I asked in the past, and that is what i was referring to). It was the same HVPS power value in the Triton 1080HD PJ.

Here is the E-Mail

[mp20748]

[Nashou66]

Mike these are not 40KV tubes, Aferg confirmed that in his E-Mail, and looking at the second sheet i have (did not take pic of it) it lists how the test are to be preformed. There is no mention of 40KV I will retype the second Sheet.

Notes:

1. The Cut off voltage is the grid No. 2 voltage required for visual extinction of an undeflected focus spot. This
is accomplished by adjusting the Grid 2 control with a fixed Cathode voltage applied.

2. The line width is measured at the center of the CRT, Both Horizontally and vertically using the merged line method.

3. Area brightness of a raster having the size indicated and the measurement taken with a photometer with a photometric
response curve. The photometer acceptance area is sufficiently large to measure several adjacent scan lines.

4. Is the peak or instantaneous value at the stated condition.

5. Is the difference between the recorded cutoff voltage and the voltage at the indicated conditions.

6. Normalize for a -50VDC grid one via reduced G2, with anode set at 20 KVDC, and raster fully scanning the phosphor area.
maintain 0 bias for less than 5 seconds.

7. Each CRT shall be subjected to a 4 hour minimum D.C. spot knocking prior to test.

8a. With heater voltage supply "off", connect the 9M198 to the test console. Set G2=0.0V, G1=0.0V, K= +250V.
Spark Trap shall be grounded for test.

b. Observe the Grid 1 leakage meter. The measure leakage should be 0:A

c. Turn the heater voltage supply to 6.3V.

d. Observe the Grid 1 leakage meter. The maximum leakage current allowed during the first 2 minuts of operation for a cold
start shall be 3:A. Record as S/SU on data sheet.

9. Set voltages and currents as follows. Burn-in to be performed for the maximum hours listed.
Set Anode voltage t 30.0KV
Set Focus voltage to GROUND
Set G2 voltage to 500VC
Set Filament voltage to 7.5V
Set Anode current to 200uA

10. When setting the 1500uA level apply a 50% duty cycle blanked signal.(This would be an on-time of 26uS for a standard 525 line raster.)
Set Anode current to 750uA. This approximates the drive conditions of 1500uA @ 100& duty cycle.


This is what the data sheet says for the test proceeders of the test records in the pics i posted.
Not sure if it helps.... I'll make sure from Aferg if these are definitely 34kv tubes.

EDIT: if you look at the pic of the data sheet you'll see on the right bottom of one pic 34 twice,
its in a column that has Eb2 and KVDC under the Eb2. I think that is the KVDC for the tubes.
Athanasios

[mp20748]

[Nashou66]

[stefuel]

[Blorton]

Holy Threadjack, Batman!!!

[1031]

[1031]

OK. THIS IS SOMETHING THAT YOU SHOULD NOT TRY IF YOU DONT HAVE EXPERIENCE AND PROPER TEST GEAR!!!!

Here are results, HV selection jumper at 40KV position-> No hv out (probably different control pcb is needet. Not clm, that one that is inside of HVPS)

I started with measuring hv and hv regulation (pictures shows that there is no variation between Min/Max contrast.So regulation works perfect.

Then i tested what is max voltage that can be taken out of HVPS. It goes up to 38KV and if i try adjust that higher then there is OVP that limits it.

OVP was set to trigger at near 36KV when i tested that. Now it limits HV to 38.250Kv so there is not much room between Max HV/OVP trigger point, only 250v.

So this evening i´m gonna test how that old M8000 hvps vith 38Kv out works with those thomas tubes..Wish me luck

[1031]

[Nashou66]

Right Jarmo, but i think that is just a maximum that the tube will handle and not what it should be run at. Aferg has them set for 34.9 KVA on the old PJ they used.
And here they ran tests on them from 20KV up to 30 KVA if you look on the second sheet describing the tests , and the results are recorded on the first page. I think the 34 KVA below the 40 KVA is what they are finally to be used at. But try them at the 38 KVA and see what happens, maybe its too much and 34 is the correct value? I did not see the blooming problem on my VNB i used for the test and neither did Aferg. But i need to put on in and have a closer look, but i did use a magnifying glass to see if i could see the individual lines that are in each grid line and they were there up to 50 for sure and still there to 60 IIRC.

But i would be interested in your experiment !!

Athanasios

[1031]

That might be true, but didnt they used some kind special focusyoke also? Maybe lower HV needs stronger magnetic field to get good focus....But i let you know how those run at 38Kv. Lets see what is results ( beware that i may need set of new tubes after my tests ) Hope not..

[Nashou66]

yes but those focus coils were also used on the LUG's as well, so i dont think that is it. Aferg also told me the focus yoke had about the same gauss just that they were encased in stanless steel to isolate the magnetic field.

Just run a red or blue i have a few more of those extra. Disconnect the HV leads for the other tubes when testing so you only possibly toast one.

Athanasios

[Blorton]

[1031]

Hello.. I´m still alive and so is marquee

Ok i started testing by measuring HV at my main HVPS, it was 35Kv. Then i installed second HVPS that was adjusted to 36KV and connected only red, raster was smaller, about two inch horizontal and little less at vertical.
Blooming seems to start little higher contrast numbers and there is more brighness also focus needet readjust to lower.
So mike was right higher hv seems reduce blooming..But if i think to use higher Hv voltages then i run out of size control and also focus range is going to be problem.
So i´m going to put my main HVPS back and live with this little issue and wait those Frankenyokes to arrive

Btw. while i was there, i measured resistanse at HV-splitter: From M8000 in-> out connectors 22Kohm and splitter from 97 7500 (8110) There was 3,3Kohm.. In theory that makes little more hv drop at high beam currents (older splitter)
But mine seems to be ok.

[Nashou66]

did you try using the lower ohm splitter on the higher voltage HVPS? and Vice versa?

Athanasios

[1031]

[mp20748]

here's something on the Thompson tubes that were being used in the early Marquees.



Marquee 9000 with Thomson CRT Replacement

Recently, Electrohome has changed the manufacturer of the CRTs used in Marquee 9000 series projectors from Thomson of France to Panasonic. The intent of this bulletin is to inform our customers what to do should CRT replacement be required on units originally equipped with Thomson CRTs. These projectors are identifible as part number 38-P13091-93. Electrohome is maintaining stock of Thomson CRT service assemblies. While supplies last, Thomson CRT service assemblies can be ordered with the following part numbers:

03-000242-01P Red CRT Bulkhead Service Assembly (Thomson)
03-000242-02P Blue CRT Bulkhead Service Assembly (Thomson)
(yes, the -02 is indeed blue)
03-000242-03P Green CRT Bulkhead Service Assembly (Thomson)

These service assemblies come with installation instructions for qualified service personnel and are recommended when replacement of one CRTs is necessary. Should the replacement of two or all three Thomson CRTs be deemed necessary, Electrohome recommends changing the three CRTs to Panasonic.This is the less expensive alternative and also ensures future CRT service assembly availability and avoids having to make the change to Panasonic CRTs at a later date when Thomson CRTs may no longer be available. A mixture of Thomson and Panasonic CRTs on a single projector is not allowed. That is, a Marquee 9000 projector must have either three Panasonic CRTs (and a 34 kV high voltage power supply) or three Thomson CRTs (and a 40 kV high voltage power supply). All of the CRT bulkhead service assemblies for the Marquee 9000 come complete with deflection yokes, convergence coils, magnetic focus coils, etc. They do not come with Video Neck Boards (VNB) or Lenses. In the case of direct Thomson to Thomson replacement, simply reinstall the old VNB(s) and lens(es). If replacing Thomson CRTs with Panasonic CRTs, only the lenses are reused.

If replacing Thomson CRTs with Panasonic, you must order the following parts:

1 - 03-000254-01P Red CRT Bulkhead Service Assembly (Panasonic)
1 - 03-000254-02P Green CRT Bulkhead Service Assembly (Panasonic)
1 - 03-000254-03P Blue CRT Bulkhead Service Assembly (Panasonic)
3 - 03-270300-07P Panasonic VNB (Video Neck Board) Marquee 9000
1 - 03-000234-01P 34 kV HVPS (High Voltage Power Supply)
3 - 39-001596-01P VNB Foam Supports

continued...2
3 - 34-001236-01P FCC Ground Wire
1 - 54-007987-05P Instruction Sheet Thomson To Panasonic 9000 Conversion

The 03-000254-XXP and the 03-270300-07P service assemblies contain instruction sheets that supplement the 54-007987-05P instructions that you must order. As well, we ask that you please return the original 40kV HVPS to Electrohome.