CurtPalme.com Home Theater Forum

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

I believe Art tested this over at AVS. If I remember correctly, then he found little radiation exposure.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Chip, As you can see in this pic there are two braided ground cables covered in a black insulation going from under the copper tape to the Video neck board, then that board is grounded to the chassis as TSE explained. I think this would work better than just to the chassis as there is lots of resistance on the VNB that the arc would be absorbed by before it goes into the chassis, not sure if my line of reason is even correct but i dont like the idea of a high voltage arc going into the chasis and who knows where eles it might arc over to that is not a ground.I got the copper tape from newark or mouser, and then you can use clear packing tape to cover the copper tape to isolate it from the chassis.

But i do like your X-ray box !!!! I was thinking of lining the plasic housings on the tube's in the marquee with the same led
sheets used for the x-ray shield to isolate any stray magnetic fields , the original PJ thath these thomas tubes were in had each tube isolated form the other to avoid any air born EMF and Magnetic Fields.

Athanasios

Ridebreck · Posted: Mon May 18, 2009 2:17 pm Post subject:

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

stefuel · Posted: Mon May 18, 2009 9:31 pm Post subject:

"The LM1202/LM2202 is not the drag on bandwidth. The CRT card output transistors are. None were ever developed that were any better is the bummer."

There must be something I can do? I mean really, all I want to do is double it Wink

Is that to much to ask Laughing

How hard would it be to adapt a set of those high bandwidth Barco neck boards? I know where there is a set.

stefuel · Posted: Fri May 22, 2009 9:25 am Post subject:

I have today off plus the long weekend Thumbs Up

Todays project is to attach some spring clips to the four corners of the shield to hold it tight to the aluminum housing. The silicon has been setting for 5 days now and should be cured. Damn those Marquee housings use a lot of silicon.
I will put the 4600 in the garage back together and test the tube this weekend.
If this project tests well and I decide to continue with the Marquee couplings in a AmPro mod, I will only seal the tube face to the coupling with silicon and fill the huge gaps aroung the edges with epoxy. A thin film of silicon will cure over night. Then use a 30 minute epoxy to fill the gap. This will allow you to use the tube right away and it will not leak. That 4 oz or so of silicon that it takes to glue a tube in takes forever to cure. The epoxy will pour right into the gap. All the air bubbles will come to the top before it cures so no air gaps to cause leaks.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

I'd like to know what is in the original tubes, I dont think it is pure silicon, maybe i could take some sample scraps to Dale at Apple rubber and have him run a test on it.... he might do it for free for me Smile

I to was thinking of Epoxy but was worried about how solid it is and if there is no "give" to it the expansion with heat of the tube and the transfered heat to the epoxy might make them both expand and not have and flex... then Pop!!!!! there goes a tube.

Athanasios

1031 · Joined: 22 Mar 2006 Posts: 657 Location: Finland

I think that grey "stuff" that is used at marquee tubes is some sort of potting material (looks about same that HVPS has inside HV-area)

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Ok I found the thread on the English AVFORUM where he actually called the fire department to take readings!!!!

Here is last post in the thread:

http://www.avforums.com/forums/crt-projectors/836409-electrohome-marquee-8110-xray-radiation-ozon-2.html

stefuel · Posted: Fri May 22, 2009 12:24 pm Post subject:

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Expensive but I wonder if this would work?

http://revereproducts.com/Merchant5/merchant.mvc?Screen=PROD&Store_Code=pioneer&Product_Code=72644&Category_Code=joint-c

Athanasios

stefuel · Posted: Sat May 23, 2009 3:26 am Post subject:

"Dang CRS." ???

Surely there must be something that can be done about the bandwidth? In all the years since these were manufactured, no one ever made better ouput transistors if even for another application?