Jack and Tim

In my confusion I got Tim and Jack twisted Sorry

It is Jack for whom I need to find my burned 3NP4?

And I sent Tim the drawing for the top panel OK?

The scan protect circuit in my 6T11 is obviously factory to my eyes. I have both the Sam’s and Riders and there is no mention of the protect circuit.

As I posted earlier, it has to be a simple modification to hook this to the main chassis.

If someone who has a set on the bench apart would trace the wires from the socket and mark up a schematic we could incorporate this into our knowledge base.

One thing for sure is the CRT's are becoming scarcer and scarcer.

The back panel on my set has 6T11 stamped in the metal plate not 400A and I wondered what the difference was and why the model changed.


Jim

Hi Jim,
Yes the burnt crt to me please and please let me know costs.
I'll do the interconnect tracing and schematic snipits.

My Sams index lists a Production Change Bulletin 105-2 for the 6T11. In it are the schematic and details for modifying the chassis for addition of the scan protect modification. Below is the schematic and wiring diagram. Here is a link to the hi-rez full page with the full instructions: http://i126.photobucket.com/albums/p88/ ... anProt.jpg

I can send a PDF if anyone wants one and sends me an e-mail request.

Very nicely done, Tim!!

Here are a couple of shots of the little 3NP4 picture tube that was used in the Scott 6T11 projection TV set.

New 3NP4's came in a cardboard box as pictured and were apparently manufactured in Holland.

This tube is 10 1/2 inches long, aluminized, and does a decent bright sharp picture when projected onto a 20+ inch flat screen.

The funnel on the side is used to pour in more electrons (literally) this would be for the high Voltage connection 25,000 volts.

You can see a line burned into the face of this new tube and thus scan failure protect was invented. Either horizontal or vertical failure can burn in a line as the high voltage is a separate power supply.

Jack will come up with something to trade for this (I'm still looking for knobs for a Admiral 7") or something, but I am keeping the box.

I last fired this tube up in 1992 and according to my note in the box it had a perfect picture. You will note no raster burn on the face.

The face plate is convex and matches the first mirror which is concave then to a flat mirror then through an aspherical corrector lens and one more mirror to the screen. All mirrors are front surface and extremely high reflective.

Jim

Afternoon JIm,
If you'd said Motorola 7" or Philco 49-xxx 7" I've got parts. Admiral - I'm pretty sure I'm not able to help there. I remember buying onr of the table model bakelite 7"ers off Ebay and the jerk packed it like it was a $2 watch. Came broke to bits , cabinet and CRT. Filed a UPS claim and off it went with them. This was many years ago.
If you have pics of what you are looking for I do have several popcorn tins with old knobs. I can go through them.

Jack

3NP4 Tube is yours I just need some time to get away from work long enough to get it in a box and you need to give me some shipping instructions. You can pay-Pal me for the shipping cost when we figure out how you want to send it.

If you drill down toward the bottom of Antique Televisions you will see "7" Admiral Knobs" As you scan through that thread you will see a couple of pictures of the correct knobs for my set, that would be the brown ones on the left. I have about given up on finding a set so I would be reasonably happy with a set that is close. On/Of-Volume and Contrast are single knobs that fit the split kind of shaft. The tuner and fine tune need to project back a little to reach the tuner shafts. I'm also missing the channel escutcheon. seems like knobs are always missing from things in antique stores these days.

I gave $50 for the Admiral and it has a stunning good CRT (7JP4), so I am compelled to restore it.

Jim