CurtPalme.com Home Theater Forum

[jetty]

I just got a runco 980 ultra last week. Checked the tubes and couldn't see bubbles in any of the tubes. I've taken the blue tube out and finally got the screw out. Nothing squirted out. I'm looking at this thing and I would swear there isn't any liquid in there. Is that possible? I don't have a syringe yet so I didn't get to see if I could pull anything out.

By the way, is it possible to get a replacement screw to put back in, I've buggered this one up some trying to get it out. Thanks.

[beachbunnyfl]

There is most likely a cured amount of silicone sealing the opening.
Use a syringe- with all the air expelled from it first,
to slowly penetrate the seal until you just see the the needle inside the tube face.
Pull back on the plunger a very little bit at a time.
You may see a small bit of cured silicone fall into the space between the
glass surfaces- don't worry- it will settle out of view later.
I have bled 6 tubes successfully.
Perhaps someone else has the specs on the screw and / or spares.
I learned to use mineral spirits to soften the silicone-
a drop at a time over a couple of days-
BEFORE attempting to loosen the screw.
Robin

[Curt Palme]

I've got screws here. I'm sure it's a metric thread, Home Depot should have something.

Put a jeweler's screwdriver blade into the hole to see if there's liquid in there. Not all tubes are under pressure, but most NEC tubes will bleed out some liquid after you take the screw out. THe odd one SHOOTS the glycol out.

[Curt Palme]

I've got screws here. I'm sure it's a metric thread, Home Depot should have something.

Put a jeweler's screwdriver blade into the hole to see if there's liquid in there. Not all tubes are under pressure, but most NEC tubes will bleed out some liquid after you take the screw out. THe odd one SHOOTS the glycol out.

[jetty]

Ha, there's stuff in there alright. Got a syringe in there and pulled some out. I checked with Lowes and Altex so far regarding screws, no luck. Heading to a jeweler and Home Depot next. I can still use the one I pulled out, but I thought I might as well put a better one back in while I had the chance.

Thanks for replying guys.

[Mark_A_W]

It's an M2 I think. Maybe a M2.5, but I don't think so.


I'd be very surprised if a warehouse hardware store carried them...they certainly wouldn't here. I'd try a specialist bolt shop.

[blue_z]

Hi there

And the screws are probably stainless steel (i.e. non-magnetic).

Regards

[jetty]

ugh. I just put the screw back in on the blue tube. I think it's fine. Didn't find any screws today. Will try specialty shop tomorrow or Monday.

The first screw on the green tube is not budging and it's getting close to being stripped. Gonna stop for the day.

There are no bubbles in the green or red. I guess I am asking for trouble if I don't bleed them.


UPdate: I think the secret is to get ALL of the silicone from around the screw. I am using the smallest jewelers slotted screwdriver to scrap around the screw head. The green came out.

[jetty]

Lessons learned:

Like it has been said, it's very important to use the correct size screwdriver. I actually found a better fit in my multi bit screwdriver set and with a larger handle. I wouldn't have had any problems if I had checked those bits first.

Be very careful regarding the pins on the end of the neck, they can bend fairly easily. When I was reinstalling the blue tube the end of the tube was resting on the crt socket and the pressure pushed the pins back. Luckily I was able to get them back in place and it slid back into the crt socket. I don't want to take that blue tube back out I can tell'ya.

It helps to mark the location of the yokes and magnets with a sharpie before removing. I was lucky that the positions were defined on the tape, but it still helped outlining them.

I haven't fired this thing up yet so maybe more to come.

[CasetheCorvetteman]

Hobby shop, use hex head allen grub screws. As long as youre using good quality Allen keys, you wont strip one out unless you serverely over tighten it.

[jetty]

Thanks for the tip. If I ever have to take them out again I will probably have to replace them with something else.