CurtPalme.com Home Theater Forum

dturco · Posted: Tue Nov 30, 2010 8:20 pm Post subject: 30 Minutes to unpott a 9" tube.

I don't know if that's good or bad.

But it was very easy. No the tube isn't ready for reinstall but it is out of the Ampro housing and ready to be cleaned up.

Here's what I did. I used a Japanese saw to cut around the tube at the housing. I cut next to the tube glass, and then next to the housing on all four sides. Then I put some GOOF OFF on the silicone and dug into the silicone with a small screwdriver and a old style masonry Cut Nail that I dragged in the grove back and forth. This allowed big chunks to come out very easy. Then I took a 2 1/2 inch flexible putty knife and ran it under the tube edge at the housing [very, very, very, carefully} to break the seal of the silicone. Last thing was to gently pry the tube up at the four corners with a very small 1/8" screwdriver the same one I used to dig out the silicone. The Goof off was applied and reapplied a few times.

I used the small screw driver on purpose for this so I couldn't exert too much force there. I'm sure if you get carried away you still could break the tube.

No pressing, no hammers, no gasoline, no real problems, just a little patience.

Maybe a decent way to do it with out the gasoline?

Anyway, it worked great for me.

Goof Off http://www.goofoffstainremover.com/

km987654 · Posted: Tue Nov 30, 2010 9:05 pm Post subject:

That all sound good. I would say though that I have found Ampro tubes are easier to remove from their LC tanks than say Barco tubes which will require additional help.

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Can you post a link to the so-called undercut or flush cut saw source ?

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

Google "Japanese saw" or "flush-cut saw" and you'll find plenty of examples...

stefuel · Posted: Tue Nov 30, 2010 10:31 pm Post subject:

AmPro housings are childs play.
Come back later and tell us how long it takes to remove a tube fron a Quee housing without the use of gasoline Laughing

zGman · Joined: 22 May 2006 Posts: 599

About 15 - 20 minutes to remove 9" tube from Marquee housing, no gasoline required.
Longer to clean all the goop off the mounting plate.
G

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Using a suitably long 1/4" diameter drill bit and a cordless drill, you can punch dozens of holes in the silicone around a tube in a Marquee
housing in just a couple of minutes. Then it's easy to cut through the remaining silicone.

I do recommend pressing the CRT out of the housing once you've weakened the silicone. Shape a wooden block to fit the face of the
CRT (as much as possible, you want maximum area to distribute the pressure) which is thick enough to stick out from the front of the LC assembly by an inch or so. Place the assembly, with block in place, face down on your workbench. Use pipe clamps on both sides of
the assembly (located near the corner of your workbench) to apply gentle, even, and slowly increasing pressure on the LC housing,
pushing it down while the tube stays put. It'll pop out soon enough.

I'm about to have to perform this process on three more LC assemblies. I've got new tubes to install in them.

AmPros are indeed easy. I've taken tubes off of AmPro mounts in five minutes. A carpenter's razor knife is a fine product for this task,
but if you really want to get slick, poke a hole through the silicone in the gap and push a small diameter WOUND guitar string through the hole. Wrap both ends of the string around a couple of sticks and use it as a wire saw. You will be able to saw the silicone all the
way around in about a minute. Get an assistant to keep the tube from popping out and hitting the floor, though.

CJ

dturco · Posted: Wed Dec 01, 2010 12:44 am Post subject:

Heh, it was my first un-potting Embarassed

I thought it was too easy. It'll be quite a while before I have to un-pott a Marquee tube, I have Bare L/C chambers to put the pt-22's in.

When I do the marquee chambers on P/J #2 [When I get it] I'll find out about the chambers then.

PiDD · Joined: 03 Dec 2006 Posts: 87 Location: Winnipeg, Manitoba

That is a LOT better than my result... im still picking glass outta my hair Wink

secstate · Joined: 20 Mar 2006 Posts: 720

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

CIR Engineering · Posted: Wed Dec 01, 2010 3:31 am Post subject:

PiDD · Joined: 03 Dec 2006 Posts: 87 Location: Winnipeg, Manitoba

karmat63 · Joined: 19 Dec 2007 Posts: 157 Location: Italy

roland@b4 · Joined: 07 Jul 2009 Posts: 82 Location: Reading UK

I had success by removing the C element, poking a thin hole through the silicon with a small screwdriver. I was then able to push a thin wire like a piano or guitar string through.
Then just worked this all the way round and the tube just popped out of the old housing.
No sawing digging or slashing of wrists with knives or saws

wadde · Joined: 19 Jan 2010 Posts: 27 Location: Sweden

*oops. double post*

wadde · Joined: 19 Jan 2010 Posts: 27 Location: Sweden

Aherm. I see twoo things that doesent belong to the set while handling tubes.... two hammers :p

http://weebls-stuff.com/wab/band/
Hammertime !

PiDD · Joined: 03 Dec 2006 Posts: 87 Location: Winnipeg, Manitoba

Maybe I had the wrong type of hammers! Curt uses the wooden ones ;P