CurtPalme.com Home Theater Forum

stefuel · Posted: Sat Apr 11, 2009 11:53 pm Post subject: My first on topic for a while

Looks like I'm gonna have to do some AmPro repairs here. But before you get started on the AmPro bashing, the problem is I've worn out the red tube. It's got low emission and poor focus.

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

You have a spare PJ as a donor right Chip?

Athanasios

stefuel · Posted: Sun Apr 12, 2009 12:35 am Post subject:

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

Say Chip

What tube type exactly for your Ampro?

.

stefuel · Posted: Sun Apr 12, 2009 2:10 am Post subject:

Tim,
It can use P19LCP's or lugs. Same pinout as Barco.

stefuel · Posted: Sun Apr 12, 2009 9:47 am Post subject:

I think it's funny how some people hold onto and insist on bashing later model AmPro's using reliability as their main complaint. This projector (to me) must be 6 years old. I hung it two weeks after buying it and it immediately developed a HVPS problem. I bought a replacement from Curt and that supply is still in it. A few years later I had a neck board act up. A few years after that I had some magic smoke appear from a bad soldered joint on the focus amp. The most recent problem was a green tube implosion that I think was the tubes fault as the replacement has been fine for a year and a half without making any other repairs. To some, that might sound like a lot of problems in 6 years but that projector is running 12-15 hours a day, every day, I $hit you not. If you don't believe me, ask Heywood. I don't think he's ever been to my house when he projector was off Thumbs Up

perisoft · Joined: 29 Aug 2007 Posts: 2920 Location: Ithaca, NY

13 hours a day? Jeez... and the red tube is fried, that's kind of odd. You're not using the PJ for mood lighting, are you? Very Happy

stefuel · Posted: Sun Apr 12, 2009 12:06 pm Post subject:

The red is original. The blue and green have been changed twice.

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

Chip if your up to trying to mod a Ampro Neck board for the Thomas tubes, I have plenty Smile

Athanasios

stefuel · Posted: Sun Apr 12, 2009 5:39 pm Post subject:

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

This one correct? I changed some thing but it should be right looking at the actual tables.

Athanasios

stefuel · Posted: Sun Apr 12, 2009 10:02 pm Post subject:

I'm not scared of rewiring it but the more pressing problem is the key. There is no room for the neckboard to rotate to accomodate the new location of the key. I remember suggesting in your Thomas tube thread that perhaps a simple solution would be to make a adapter plug to go between the Thomas tube and neckboard of choice. That might be just as simple as smashing a old tube for the necks plug and scavange a socket from a old neck board to make it up. Do you follow me here? I know I have the stuff here to do it and I am on vacation Wink

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

the key is the same as the LCP's the diagram is for the sony tubes but these Thomas tubes have the key in the location as the lUG's and LCP's.

Athanasios

stefuel · Posted: Sun Apr 12, 2009 11:47 pm Post subject:

So your saying forget the key and paint by the numbers? I can do that.

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

Right, the pin 3 on the thomas tube would be pin 4 on the LCP 09 or LUG and pin 9 on the Thomas would be pin 10 on the LCP 09 or LUG. the pins are one off in numbers but you dont have to go by numbers. Go by the designation. On the Marquee VNB i had to drill out where pin 4 would be and I jumped the G1 from socket 5 to the new socket 4 i drilled. the I had to cut the G1 trace(socket 5) and drill it out larger to make room for the G2 wire to connect to the thomas tubes G2(pin 4), see how the numbers are off by 1.

Athanasios

stefuel · Posted: Mon Apr 13, 2009 2:54 am Post subject:

I see where that comes from. MEC counts the edge of the key as a pin location. So there is never a pin 3. The Sony and Thomas tube does not count that section of the rotation as pin 3 therefore the next available pin is pin 3. The Sony pin-out shows a pin for a "spark arrestor". What did you do with that. As I recall, you did complain about some sparking within the tube or was that something different.
Lastly, how did you find magnetics placement? were they generally in the same location for the Thomas tubes as the MEC's? I don't recall you finishing testing so I don't know the final result.

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

I did the test on a used tube and that is why i had sparking(crud on the cathode or the G2). The Arc Supressor just had a large resistor 100k-1M to ground. Jarmo(1031) has a set in his Marquee as does Crt-Ben. The magnetics fit the same as on an LUG as they have the same bell housing shape. I can send you one to test if you like it keep it and pay me later.

Athanasios

Heywood Jablome · Joined: 12 Mar 2006 Posts: 1548

stefuel · Posted: Mon Apr 13, 2009 6:38 pm Post subject:

stefuel · Posted: Mon Apr 13, 2009 11:13 pm Post subject:

That shot in the previous post is one of my first round of screen shots. It's one of the best ones I've taken but still not able to match what you would have seen in person. We all know it's from a AmPro 4600HD but can you guess the source equipment?