An NOS '49 Motorola 7VT2 TV

[EdKozk2]

Nice set . The crt looks like it has the cadmium phosphor, original.
Ed

[decojoe67]

Originally Posted by EdKozk2

Nice set . The crt looks like it has the cadmium phosphor, original.
Ed

Thanks. Interesting about the CRT. It definitely looks original. Even the metal around it shines like new and the tape strip holding it on looks like it was just placed there.

[bandersen]

Amazing score! I'm glad it ended up in your hands It looks like the knobs don't have the white crud that so often plagues these sets.

Originally Posted by EdKozk2

Nice set . The crt looks like it has the cadmium phosphor, original.
Ed

I'm not sure what you mean ? Why would this TV have a different phosphor ? Doesn't every 7JP4 have the same type of P4 phosphor ?

[decojoe67]

Originally Posted by bandersen

Amazing score! I'm glad it ended up in your hands It looks like the knobs don't have the white crud that so often plagues these sets.



I'm not sure what you mean ? Why would this TV have a different phosphor ? Doesn't every 7JP4 have the same type of P4 phosphor ?

Thanks Bob. It wasn't exactly a bargain, but I couldn't resist it. It glistens like new in and out.
Yeah, I too have never heard of a particular phosphor on a 7JP4.

[Kevin Kuehn]

As nice as that TV is I personally wouldn't consider calling it new old stock. Realistically anything found as NOS should have all the original components still under chassis, as well as all the original packing materials. Basically an unmolested and unopened item as shipped from the factory. Just my opinion of course. Otherwise a beautiful specimen.

[Popester]

Amazing! It’s as if it had come from a time capsule.

[decojoe67]

Originally Posted by Kevin Kuehn

As nice as that TV is I personally wouldn't consider calling it new old stock. Realistically anything found as NOS should have all the original components still under chassis, as well as all the original packing materials. Basically an unmolested and unopened item as shipped from the factory. Just my opinion of course. Otherwise a beautiful specimen.

Technically yes, but when you look this set over, it's hard not to want to push it's description towards "NOS". I'm surprised the previous owner did elec work to it without at least re-stuffing the old caps, but in a way I'm glad I don't have to stress over "should I or shouldn't I"! If I was to leave it untouched I would just sell or trade it. I dislike static display sets.

[EdKozk2]

Originally Posted by bandersen

Amazing score! I'm glad it ended up in your hands It looks like the knobs don't have the white crud that so often plagues these sets.



I'm not sure what you mean ? Why would this TV have a different phosphor ? Doesn't every 7JP4 have the same type of P4 phosphor ?

Hi Bob,
I recall reading in some old literature that the chemical elements for the P4 phosphor were changed in the 50's. The percentages of some the chemical elements were varied. The older crt's tend to look much yellower. I see this difference in many of the sets I have with original crts. The newer 7JP4 like I bought in 1974 looks more gray/white. I even noticed this on a 5BP4 I bought from the ETF a few years ago.
Ed

[Electronic M]

Originally Posted by EdKozk2

Hi Bob,
I recall reading in some old literature that the chemical elements for the P4 phosphor were changed in the 50's. The newer 7JP4 like I bought in 1974 looks more gray/white. I even noticed this on a 5BP4 I bought from the ETF a few years ago.
Ed

Every major manufacturer could (and some did) vary powered phosphor color... unpowered phosphor color can be as much a function of runtime as manufacturing process. If you have encountered a round tube that sat behind a square mask and was set up for minimal overscan there will be a browned center square and a blue outer ring.

[EdKozk2]

The wikipedia covers some of the P4 formulations, with and without cadmium or beryllium.

https://en.wikipedia.org/wiki/Phosphor

The table pictured is from a copy of U.A Sanabria's Television Course book published in 1948. The listing for P4 phosphors should use a plus sign instead of a minus.
Ed

[decojoe67]

The Motorola lives again! I had my friend go over the chassis. It had been professionally worked on, but with a minimalistic approach. Now it's been tweaked to be a reliable performer. The photo doesn't do the screen-shot justice. It plays like new. The audio is loud and crystal clear. Those Motorola TS-18 chassis are very good.