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pm
Joined: 23 Aug 2010
Posts: 85
Location: Hants UK
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| Posted: Fri Jan 24, 2014 6:12 pm Post subject: New(ish) Tubes Incoming! Silly excited..... P19LUG-->1209 |
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Having done a deal for a set of low hour (<1000hrs) P19LUG with c-elements, I'm on a hunt to gather top tips when swapping them out.
I've downloaded the Barco document for the 808s from here and if it had said 1209s at the top, I wouldn't have known the difference.... Are there any practical differences?
So, in short, I'd really appreciate some practical tips, generic or Barco specific please. Especially any tales of woe and how to avoid them.... the hard learnt lessons...
The bit that gives me most apprehension is adjusting the 4 pole/2 pole magnet rings with the machine live. Again, the instructions are very matter of fact and reality very rarely is. Anything that gives a practical slant on the instructions will be gratefully received.
Cheers,
Paul
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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: Fri Jan 24, 2014 6:35 pm Post subject: |
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Biggest thing is make sure when you install the tubes that the key on the tube will fit the video amp socket. Barco had at least three configurations on orienting the tube (two for the 808/1209, one for the 919 tubes that are rotated 90 degrees..
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pm
Joined: 23 Aug 2010
Posts: 85
Location: Hants UK
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| Posted: Sat Jan 25, 2014 12:41 am Post subject: |
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Ooh errr.... I have P19LUG's at the moment.... is a LUG not a LUG not a LUG then??
Is it a new socket for the card or a complete new video amp required?
Cheers,
Paul
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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: Sat Jan 25, 2014 1:32 am Post subject: |
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No, in that case you're fine. I thought you were converting a BG808s to a 1209s...
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pm
Joined: 23 Aug 2010
Posts: 85
Location: Hants UK
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| Posted: Sat Jan 25, 2014 2:09 am Post subject: |
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Ah, I was just saying above that the only document I could find for a Barco tube change was for the 808s and that it looked identical to the 1209s.
Sorry for the confusion. As usual, I know what I mean!! 
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sat Jan 25, 2014 11:28 am Post subject: |
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One thing I was wondering about (I am going to do the same) is the positions A and B in the manual where you have to mark the position of the focus coil and cpc magnets. It seems like they are all shifted close to each other on Barco. With my Marquee I had a lot of space there. So my question is if Barco is that simple or are my coils and magnets bad aligned on the tubes that I have now?
_________________
701s->runco933->8500ultra->cinemax->9500mp->919 splitpack + cinemax
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Sat Jan 25, 2014 11:38 am Post subject: |
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Must be a difference in focus coil construction, i have had
- a 808
- a cine 8
- a 1208s/e
All original parts from Barco and all had ideal focus near the CPC magnets. On marquee's it seems to be almost the inverse!
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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: Sat Jan 25, 2014 3:14 pm Post subject: |
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I think overall focusing based on where the yokes are depends on:
-HV level
-tube structure
-yoke structure
I know with the BArcos, changing the EHT board or quad or splitter can shift the HV by a bit, and that affects global focusing. The only concern would be if the focus yoke is all the way forward or back, and you can't reach ideal focusing with the electronic focus setting.
The overall position of the yokes and astig magnet isn't that important.
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pm
Joined: 23 Aug 2010
Posts: 85
Location: Hants UK
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| Posted: Sat Jan 25, 2014 3:38 pm Post subject: |
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From the Barco document....
| Quote: | move the focus unit slowly
for- or backwards for max
focusing in the middle of the
screen - |
I take it this means on the face of the CRT. Is this best done looking through the lens, or take it off?
Is the point of best focus sharply defined or is there a broad range of movement where the focus doesn't appear to change much?
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