100° Picture Tubes

[nasadowsk]

In general, sets from the 40's will be 70 or less, then by the 50's they were 90, then by the late 50's 100 and up, for B&W sets. A 21 inch 70 degree tube is a big thing, a 21 inch 110 degree tube's a heck of a lot smaller.

It was better sweep circuits (and I suspect better magnetics) that allowed them to get the angle up.

Color lagged because of pin cushion issues, but B&W sets even in the early 50's had geometry correcting magnets on the neck...IIRC there was some yoke magic, too...

[old_coot88]

OOPs. Double post

[old_coot88]

Originally Posted by nasadowsk

It was better sweep circuits (and I suspect better magnetics) that allowed them to get the angle up.

Also, a smaller diameter CRT neck allowed tighter coupling of the yoke's field to the electron beam. Ergo, greater sweep angle.

Smaller neck also meant smaller gun assembly and smaller emissive surface on the cathode, which apparently caused the notoriously short longevity of 110° tubes.

[Popester]

Those old color 70 degree console sure stuck out from the wall back in the day. I remember when Sony came out with a 114 degree tube in 19" size. They made a big deal of how slender the cabinet size was in their marketing material.

[NewYorker]

Thanks everyone.

I guess a rough way to differentiate bet.ween a 100° and a 90° tube is to peek through the vents on the back. If you've seen enough 100° tubes they are easier to spot because they are more shallow.

NewYorker

[zeno]

The Zenith you are looking for are mostly known as System 3. They
used an EFL 110 deg in line CRT. Chromacolor 2 ( CC2 ) sets used a 90 deg
delta gun CRT but it gets confusing !
EFL sets first came out in late 1976 on top of line 17" & 19" using
a CC2 style chassis. By 1979 almost all sets had EFL jugs 13", 19", 23" & 25".
These used the System 3 style chassis. Due to cost EFL was phased out
starting apx 1983. The sets are very common, they sold more color sets
than anyone in the US. Best bet is if you think you found one post the
model number & we can look it up.

73 Zeno
LFOD !

[NewYorker]

Originally Posted by zeno

The Zenith you are looking for are mostly known as System 3. They
used an EFL 110 deg in line CRT. Chromacolor 2 ( CC2 ) sets used a 90 deg
delta gun CRT but it gets confusing !
EFL sets first came out in late 1976 on top of line 17" & 19" using
a CC2 style chassis. By 1979 almost all sets had EFL jugs 13", 19", 23" & 25".
These used the System 3 style chassis. Due to cost EFL was phased out
starting apx 1983. The sets are very common, they sold more color sets
than anyone in the US. Best bet is if you think you found one post the
model number & we can look it up.

73 Zeno
LFOD !

Unfortunately, that is not what I'm searching for.

I'm looking for TVs with 100° CRTs.

Thanks.

NewYorker

[Popester]

Hey Zeno what is EFL?