Emerson 609 projection TV

[Eric H]

How does the image look directly on the CRT? (I use a mirror to avoid X rays)
I've cleaned these mirrors with soap and water, I even removed the silvering on one and it was really tough to do, that said it will depend on what condition it's in to begin with.

[Phil Nelson]

The image on the CRT looks good, although it's a little hard to judge when peering in at such an angle. Of course, the smaller the CRT, the sharper things look, too. If I remove the side plates from the optics box, I should be able to inspect the mirrors more closely.

On another note, has anyone ever seen patent documents for the Norelco Protelgram unit? I assume it was patented somewhere, although a quick search of US patents didn't turn up anything.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[cbenham]

Originally Posted by Phil Nelson

The image on the CRT looks good, ------

On another note, has anyone ever seen patent documents for the Norelco Protelgram unit? I assume it was patented somewhere, although a quick search of US patents didn't turn up anything.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

I think probably patented in the Netherlands by Philips. I have one protelgram projection unit made by Mullard, much more robust and heavy duty. The optics are claimed to be f 0.62. Now THAT's FAST !!!

[Josef]

Hello Phil,
Great to see your set working that well
I'm 99% sure that the CRT socket is an Au74 like it's used on an AB2 tube for example. In German language this socket is called Außenkontaktsockel.

[Phil Nelson]

Thanks, that does look like the tube base. The Phillips 3NP4 data sheet is at:

https://frank.pocnet.net/sheets/201/3/3NP4.pdf

In an effort to eliminate more variables, I tried injecting video and audio directly at the amplifiers, bypassing the tuner and IF stages. The results were good, so I wired in cables and made a little junction box where I can plug in A/V cables from a DVD player, etc.



The picture looks better than before, and the audio is outstanding:



More details in my article at:

https://antiqueradio.org/Emerson609P....htm#Injection

The screen geometry is approaching normal. The picture is still somewhat off-center horizontally, a condition I hope to cure by raising the optical box using its bottom "tilt" adjusters.

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

[kvflyer]

Originally Posted by Eric H

How does the image look directly on the CRT? (I use a mirror to avoid X rays)
I've cleaned these mirrors with soap and water, I even removed the silvering on one and it was really tough to do, that said it will depend on what condition it's in to begin with.

Tom, I skimmed this thread and apologize if I missed the answer. But... is it possible to look directly at the CRT and determine if the picture is in good linearity? I realise that may be a pain to remove or whatever. I just wonder if viewing that picture directly may save a lot of headaches in the process.

Sorry if I am asking the obvious. I really want this to be another success for you!

[Phil Nelson]

Originally Posted by kvflyer

is it possible to look directly at the CRT and determine if the picture is in good linearity?

When the CRT is in the optical box, you can only view the CRT face from the side:



But if you remove the entire tailpiece assembly, you could view the CRT face fully:



I'm concerned about X-rays in that scenario. At 25KV, X-rays are a factor, so would you get fried if you view the CRT outside the metal box?

Somewhere, I saw a statement from bandersen that more X-rays are generated from HV rectifier tubes than the CRT itself. Can anyone verify that? In this set, the HV rectifiers are sealed in their own little metal box, so if the CRT itself isn't a big emitter, maybe viewing it outside its box wouldn't be so dangerous . . . ?

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

[old_coot88]

If there wuz anything to the Xray scare, all my kids should have two heads and six fingers.