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What Potting should I use for tubes.Finally converting to 9'

 
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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Sun Dec 09, 2012 12:24 am    Post subject: What Potting should I use for tubes.Finally converting to 9'

I am finally converting the longbows to 9" LC with the thomas tubes. Almost have the housing ready .

But I want to do it right and just using silicon from the tubes sucks. Due to application and
longevity issues I have found in my test tube. So i was looking at this

http://mgchemicals.com/downloads/tds/tds-832tc-2parts.pdf

And this

http://www.quantumsilicones.com/wp-content/uploads/2012/02/QSil-5533.pdf

I think the first one will suit me well If it flows easily.

Both are for sale at Amazon.

Also what was the correct RTV to use for the initial adherence of the Glass to the Face plate.
Was it GE? I forgot.

Athanasios

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stridsvognen
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Posted: Sun Dec 09, 2012 12:38 am    Post subject:

What about something like this stuff..

http://solutions.3m.com/wps/portal/3M/en_US/Marine/Home/Products/Catalog/?PC_7_RJH9U5230GE3E02LECIE20S4K7000000_nid=GSKQJHJTYNgsQH8HT14PGTglG65TRKDG1Lbl
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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Sun Dec 09, 2012 1:16 am    Post subject:

I want something pourable. With a little bit of flow. I never feel safe using squeeze in products , you never know if it will flow all the way down to the bottom of the chamber.

Which of the two I chose has more pour-ability ? Is it the Higher or Lower cps number? if its the lower then the Qsil 553 i'll get.

A bit expensive but i want it as close to stock as possible. I wonder how many tubes a Quart will do?


I have all but one Housing striped and painted with VHT epoxy paint. The last LC housing I have to
strip has a used Green Thomas tube I mounted for testing the VNB mod to make them work with the Sony 09MEX
pin out's.

I also realized I have three 8" LC housing here. I'll have to do the same with these and maybe use the longbows 8" tubes for a 8" LC projector project. Maybe get another set of 8" LC housing incase I don't like the Thomas tubes.

OR......I can wait for another G90 to show up localy and do a G90 blend.

So many Options !! Wink

Athanasios

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Last edited by Nashou66 on Sun Dec 09, 2012 1:34 am; edited 1 time in total
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G

Posted: Sun Dec 09, 2012 1:33 am    Post subject:

Nashou66 wrote:
I want something pourable. With a little bit of flow. I never feel safe using squeeze in products , you never know if it will flow all the way down to the bottom of the chamber.

Which of the two I chose has more pour-ability ? Is it the Higher or Lower cps number? if its the lower then the Qsil 553 i'll get.

A bit expensive but i want it as close to stock as possible. I wonder how many tubes a Quart will do?


I have all but one Housing striped and painted with VHT epoxy paint. The last LC housing I have to
strip has a used Green Thomas tube I mounted for testing the VNB mod to make them work with the Sony 09MEX
pin out's.

I also realized I have three 8" LC housing here. I'll have to do the same with these and maybe use the longbows 8" tubes for a 8" LC projector project. Maybe get another set of 8" LC housing incase I don't like the Thomas tubes.

OR......I can wait for another G90 to show up ;oca;y and do a G90 blend.

So many Options !! Wink

Athanasios


When you get that G90 going give me a call. I'd like to see it as compared to your Marquee's

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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Sun Dec 09, 2012 1:36 am    Post subject:

AnalogRocks wrote:
Nashou66 wrote:
I want something pourable. With a little bit of flow. I never feel safe using squeeze in products , you never know if it will flow all the way down to the bottom of the chamber.

Which of the two I chose has more pour-ability ? Is it the Higher or Lower cps number? if its the lower then the Qsil 553 i'll get.

A bit expensive but i want it as close to stock as possible. I wonder how many tubes a Quart will do?


I have all but one Housing striped and painted with VHT epoxy paint. The last LC housing I have to
strip has a used Green Thomas tube I mounted for testing the VNB mod to make them work with the Sony 09MEX
pin out's.

I also realized I have three 8" LC housing here. I'll have to do the same with these and maybe use the longbows 8" tubes for a 8" LC projector project. Maybe get another set of 8" LC housing incase I don't like the Thomas tubes.

OR......I can wait for another G90 to show up ;oca;y and do a G90 blend.

So many Options !! Wink

Athanasios


When you get that G90 going give me a call. I'd like to see it as compared to your Marquee's


I think the 9" conversion will happen way before that!!

But there is a guy locally that has a G90. he came to my diner one day and introduced himself.I think his name was john I lost a PM he sent me. I wanted to get in contact with him to go help him with the G90 and forgot. Your post just reminded me.

But either way Your more than welcome to stop by anytime your down here visiting.

Athanasios

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CxTurbo



Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada

Posted: Sun Dec 09, 2012 4:41 pm    Post subject:

Nash,

I have a set of 8" LC tubes without the Green C-element that I would offer up to only you should you decide to go that way. I myself have been toying with the idea of doing a 9"LC stack. But, I need to get one working first, before I can even think about doing two. Plus I would need a second set of 9" chambers/tubes.

Anyhow, Food for thought as they are staying with me otherwise.

James

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stefuel



Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA

Posted: Sun Dec 09, 2012 6:11 pm    Post subject:

I'm not sure you will be satisfied with those tubes. I found them to be real sharp but only at lower output. Perhaps the Marquees circuitry will handle it better.
As for mounting in those housings, I would lay in a small bead (1/16th) of black general purpose silicone on the face edge of the tube setting them in place and let them dry. At this stage of the game you will probably only be doing this one last time so I would use any 1 hr epoxy to fill the gap to hold it in place. That fully cures in 24 hrs and you'll be good to go.
God help you if you wish to do it again Wink

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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Mon Dec 10, 2012 2:12 am    Post subject:

Preparing for the 9" upgrade.



Pit left from Aluminum Flesh Eating Disease(glycol on exposed aluminum).



Just the beginning. Lots of work to do!

Athanasios

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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G

Posted: Mon Dec 10, 2012 2:51 am    Post subject:

Ahhh a little Bondo will fix that right up Laughing
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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Mon Dec 10, 2012 2:58 am    Post subject:

AnalogRocks wrote:
Ahhh a little Bondo will fix that right up Laughing



Umm No, But i will be using that on the Advent Speaker on the left.

Athanasios

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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G

Posted: Mon Dec 10, 2012 3:00 am    Post subject:

Nashou66 wrote:
AnalogRocks wrote:
Ahhh a little Bondo will fix that right up Laughing



Umm No, But i will be using that on the Advent Speaker on the left.

Athanasios


Fiberglass may be better in that application.

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Phoenixed



Joined: 13 Oct 2011
Posts: 514
Location: The mitten

Posted: Mon Dec 10, 2012 6:57 am    Post subject:

If you cant fix it, fiber glass it.
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G

Posted: Mon Dec 10, 2012 8:39 am    Post subject:

Phoenixed wrote:
If you cant fix it, fiber glass it.


I redid my truck I had in my 20's with fiberglass. I looked at it recently. It's still holding up! Well the fiberglass areas are. The rest of truck, not so much. Laughing

That should hold around that woofer OK.

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CRT_Ben



Joined: 28 Aug 2006
Posts: 1684
Location: Northern Virginia

Posted: Mon Dec 10, 2012 5:36 pm    Post subject:

stefuel wrote:
I'm not sure you will be satisfied with those tubes. I found them to be real sharp but only at lower output. Perhaps the Marquees circuitry will handle it better.
As for mounting in those housings, I would lay in a small bead (1/16th) of black general purpose silicone on the face edge of the tube setting them in place and let them dry. At this stage of the game you will probably only be doing this one last time so I would use any 1 hr epoxy to fill the gap to hold it in place. That fully cures in 24 hrs and you'll be good to go.
God help you if you wish to do it again Wink


Nash this immediately came to my mind and I want to echo Chip's warning. My Thomas tubes could not focus worth a damn at contrast levels above 40, and even below 40 they were terrible compared to Panasonic tubes. Even 8" tubes. Granted mine seem worse than yours or Chip's (I would never call mine real sharp..not even sharp, at any contrast level).

Please figure out if these will work before you spend a ton of time and epoxy them into your LC housings. Maybe just do one (green, perhaps) to test?

All I know is I spent hours prepping and setting all my tubes and got a sh*tty result, and I don't want it to happen to you.
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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Mon Dec 10, 2012 5:41 pm    Post subject:

I have tested the green. I thought it was very good. Now remember Ben you had used tubes. These are new. Now I know chips were new, but the ampro is different. and if its is not as sharp at the level I want i9 dont think it really matters since i'll be running 800p.
plus Im bored and this gives me something to do. Wink

Thanks for the concern guys.

Nashou

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Phoenixed



Joined: 13 Oct 2011
Posts: 514
Location: The mitten

Posted: Mon Dec 10, 2012 6:13 pm    Post subject:

The great restaurant owner is bored?!?
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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Mon Dec 10, 2012 8:32 pm    Post subject:

Phoenixed wrote:
The great restaurant owner is bored?!?


LOL, yeah when I get home i forget about that nut job place and do my own thing.Wink

I just sent Antoine a question about the Tubes to see if they needed a Higher
HV voltage. he said they were spot knocked at 40KV for testing but were run in the
Trident T-1080 at 34.5KV. He said the 34.9 KV of the marquee should not be a problem.
he did say in the Marquee it be best to run a lower G2 than normal. I did notice that
in my test of the new and used tube. He also said he has a set of yokes and Focus coils
from the Trident he'd send me. Very Happy the Focus coils are 4lbs each!!!!

I might ask him for them. Just to see what they are. Moowwaaaaaa!!!!!Wink

Athanasios

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