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 Post subject: 1948 Scott Projection TV
PostPosted: Jun Thu 10, 2021 2:05 am 
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I have an opportunity to purchase this Scott projection TV from a seller about an hour from me. According to the seller it has never been touched or refinished but they don't have an idea if it works or not (not that they should plug it in to try and find out). I would like to know if anyone here has one or worked on one. Do sets like these have any repair pitfalls that anyone here might have knowledge of? Is it a worthy candidate for restoration with some desirability, or is it more a curiosity? I have never seen one before and am intrigued by it.

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Thu 10, 2021 2:40 am 
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The legs are newer than the set. This set uses the Norelco protelgram optics.

If the price is under $300 I'd grab it. One went for much cheaper in the 2018 or 19 radiofest auction (the day before the swapmeet I attended) and I was kicking myself for missing it the next day.

Probably the most compact tube projection set you can buy, and also one of the best suited ones for adding a color wheel to convert to color.


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Thu 10, 2021 3:21 am 
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They do not show up often and when they do there is always interest. Scott ads called it the 400A but every one I have seen has the model 6T11 or 6T11A on it. It looks in nice condition so if you are interested in projection TV you should grab it. It may be quite a while before another comes along. I agree with the $300 or below number. If you do get it you will then have to get A Scott 800B Radio/Phono to complement it. :) Here is mine and the Scott ad for it.


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Thu 10, 2021 3:46 am 
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Tim wrote:
They do not show up often and when they do there is always interest. Scott ads called it the 400A but every one I have seen has the model 6T11 or 6T11A on it. It looks in nice condition so if you are interested in projection TV you should grab it. It may be quite a while before another comes along. I agree with the $300 or below number. If you do get it you will then have to get A Scott 800B Radio/Phono to complement it. :) Here is mine and the Scott ad for it.


The guy wants $200 for it but is willing to negotiate. Looking at your ad copy, my eyes bugged out seeing the original cost for the table top model at $695. That would be over $7700 in todays dollars! :shock: :shock: :shock:

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Thu 10, 2021 3:29 pm 
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I've never seen a projection TV like that. Rare find.
I would suggest you read through this article that Phil wrote before deciding on it.
https://www.antiqueradio.org/Emerson609 ... vision.htm

Despite the small size of the Scott, it probably isn't an easy set to begin with.
Some optical elements to deal with, probably a hard to find CRT that operates at an especially high voltage.

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Thu 10, 2021 7:40 pm 
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Location: Greenville, NC 27858
CRT is not that hard to find [I have several NOS & good used].
Set is fairly straight forward to restore, hopefully concave mirror in projector is good, just
clean carefully. Most sets do not have the vertical sync safety circuit which prevents destroying the crt:
this circuit can be added, using a 6sn7 [circuit is available on internet].
Some part replacements are a tight fit with some of the e-cap values, in some sets, not agreeing with schematic.
Several different tuners were used in this set. I still have a few parts from previous ones, free for asking.
I think I still have a re-silvered mirror I never installed.
I have seen restored sets go for over $1k.


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Thu 10, 2021 7:51 pm 
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Straight forward re-capping on a re-arranged 630 chassis. The flyback is used but the high voltage winding is ignored. Underchassis wiring is very tight, too. You are lucky to have found one fairly intact. That's a worthwhile project and the smallest projection television made, a plus. Good luck on that, Craig


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Fri 11, 2021 4:13 pm 
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the gentleman selling it has accepted $150 for it and I go to pick it up sometime tomorrow morning. Once I do I will take better pictures of the inside and other portions to share with the group.

Brian

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Fri 11, 2021 4:24 pm 
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Phenomenal deal, IMHO. I think that's one of the coolest sets ever, and one of the few I'd be tempted by nowadays. If by September Kutztown you decide you're over it, you can always sell it to me for a good profit. :)


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Fri 11, 2021 4:32 pm 
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Tim Mullen wrote:
Phenomenal deal, IMHO. I think that's one of the coolest sets ever, and one of the few I'd be tempted by nowadays. If by September Kutztown you decide you're over it, you can always sell it to me for a good profit. :)


Well Tim, if I open 'er up and begin trembling from fear over what I may be trying to tackle which is out of my scope of abilities, I may take you up on that! :lol: :lol: :lol:

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Fri 11, 2021 11:01 pm 
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Location: Chicago, IL USA
Here's the inside of mine before cleaning. https://flic.kr/p/hYyqTe


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Fri 11, 2021 11:42 pm 
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bandersen wrote:
Here's the inside of mine before cleaning. https://flic.kr/p/hYyqTe


Bob, may I ask how you cleaned it? Was there any special technique or product you used? I have yet to see the inside of this one and won't until I pick it up, but I want to not make anything worse by inadvertently using something I shouldn't have to clean it.

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Sat 12, 2021 11:22 pm 
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Just a soft brush and compressed air. A little Windex on the the tubes. Don't try to clean the mirror inside the projection box. It's a front surface mirror. Than means the silver plating is on the surface of the glass. Very difficult to clean without damaging the plating


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Sat 12, 2021 11:50 pm 
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Hello Bob, love your videos.
Did you make a video of this set? You have so many videos I am slowly making my way through when I have a chance.
I'm guessing that set is hefty for it's cabinet size.
Did you (or plan to ) have the mirrors re-silvered?
From what I've read of a projection set that Phil restored the optics are a whole problem by themselves.

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Sun 13, 2021 5:36 am 
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Notimetolooz wrote:
Hello Bob, love your videos.
Did you make a video of this set? You have so many videos I am slowly making my way through when I have a chance.
I'm guessing that set is hefty for it's cabinet size.
Did you (or plan to ) have the mirrors re-silvered?
From what I've read of a projection set that Phil restored the optics are a whole problem by themselves.


Thank you. Yes I did about 8 years ago when I acquired the set: https://youtu.be/5MzNEzVnxJg
It had been in a basement for many years and water dripped onto the cabinet. It needs extensive repairs and the mirrors are in bad condition.
Luckily I later found a NOS optical assembly, 3NP4 and a spare HV supply.

Not my intention to hijack your thread. I'm thinking these photos will be useful to aid your restoration.

Image Image

Here's a peek under the main chassis. Looks like quite a challenge.
Image


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Sun 13, 2021 5:48 pm 
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bandersen wrote:
Notimetolooz wrote:
Hello Bob, love your videos.
Did you make a video of this set? You have so many videos I am slowly making my way through when I have a chance.
I'm guessing that set is hefty for it's cabinet size.
Did you (or plan to ) have the mirrors re-silvered?
From what I've read of a projection set that Phil restored the optics are a whole problem by themselves.


Thank you. Yes I did about 8 years ago when I acquired the set: https://youtu.be/5MzNEzVnxJg
It had been in a basement for many years and water dripped onto the cabinet. It needs extensive repairs and the mirrors are in bad condition.
Luckily I later found a NOS optical assembly, 3NP4 and a spare HV supply.

Not my intention to hijack your thread. I'm thinking these photos will be useful to aid your restoration.

Image Image

Here's a peek under the main chassis. Looks like quite a challenge.
Image


Bob, please don’t feel like that’s a hijack at all! In fact, I completely welcome any and all information because truthfully there does not seem to be a lot of discussion or information about this set online in general. That goes for everyone who can offer advice and what to watch out for.

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Sun 13, 2021 10:06 pm 
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I have some knowledge about first surface mirrors from my dealing with a telescope hobby I've had in the past. First surface mirrors since before WWII have been "silvered" with aluminum in a vacuum chamber.
The process is very similar to the way aluminum is added to the screen of a CRT. Often in recent years an overcoat of aluminum oxide or something similar is added.
Regular rear surface mirrors are silvered by using a silvering chemical process. A rear surface mirror can then be coated with an enamel paint to protect the silver (which would tarnish fairly soon on the front surface). Besides the company in Florida there was a one time a company in Skokie, IL called H.L. Clausing. Maybe it is gone now.

In article by Phil Nelson, he though the screen was plastic with a different textured surface on the two sides.
If it is, I wonder what clear plastic that old doesn't yellow much.
Bob's info seems to suggest it is glass with some sort of coating. In either case any scratches can't be buffed or polished out.

Since Brub's cabinet is in such good shape maybe the optics are clean.

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Mon 14, 2021 9:33 pm 
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Notimetolooz wrote:
Besides the company in Florida there was a one time a company in Skokie, IL called H.L. Clausing. Maybe it is gone now.

I used Clausing for the concave mirror in my 741PCS. Came out ok, but I'd look around. Telescope folks seem not as happy with them anymore:

http://www.loptics.com/ATM/ATMlinks.html


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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Mon 14, 2021 11:49 pm 
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WARNING: Pic heavy comment!

Finally picked it up and got it home this afternoon. Several observations:

1. I'm pretty certain I blew half the discs in my back out carrying this thing. Its a beast and weighs a ton! Seriously on a heating pad right now. Built like a tank and the construction is gorgeous. They didn't skimp on the cabinet and my back let know...

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2. Bakelite handles are in perfect shape. Grateful for that because I'm sure I'll never be able to find replacements.

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3. The glass screen is intact but has a yellow tint to it. Have no idea if that is normal or not. The side screens are all there but one is torn at the seam and will need to be repaired.

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4. Chassis looks pretty intact except for the tubes. Most are gone and probably salvaged for another set I would guess. Several loose ones inside the chassis so I set them aside. The original removable plug seems to have been bypassed at some point and a hard wired one added which is rotted. Tube chart pictured below.

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5. Took a look inside the Protelgram to get a sense of the mirror condition. Looks pretty decent with the exception of a bit of flaking between 2 and 3 o'clock. Something seems strange to me about the CRT though, as if it is upside down or got turned.

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 Post subject: Re: 1948 Scott Projection TV
PostPosted: Jun Tue 15, 2021 12:23 am 
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That looks fairly good.
I don't see anything unexpected about the CRT. What exactly is your concern?
When you look into a plane mirror the image is reversed left to right. Do you follow that?
When you look into a concave mirror and are outside the center of curvature, the image is also
inverted top to bottom as well. Maybe that is what is throwing you.
Have you looked at the article on Phil's Old Radios?
How about the video that Bob Andersen did? Also his thread on VideoKarma?
You need to look at those, they will explain many things.
You set have the small chassis in the very center had is the safety CRT cutoff, that's very good.

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