bandersen
03-05-2011, 08:54 PM
Some of you may have seen this picture tube listed on eBay. Well, I'm the one that took a chance on it.
It arrived safe and sound although the box is in rough shape.
http://farm6.static.flickr.com/5011/5500748723_bca75ac710_b.jpg
http://farm6.static.flickr.com/5219/5501342356_39f48d10b9_z.jpg
The only mark or label on the CRT is a "10X" written in marker.
Anyone know what this tube is ? Perhaps experimental ?
http://farm6.static.flickr.com/5138/5500748949_0dc11eaed8_b.jpg
I tried testing it as a 10BP4, but had to drop the bias from -52 to -36 to get the cutoff in the black box. It test very strong and has an excellent life test.
http://farm6.static.flickr.com/5254/5500749611_5af86db03e_b.jpg
jr_tech
03-05-2011, 09:21 PM
Sure looks like an electrostatic focus gun to me, but no extra connection... focus element could be tied internally to the 1st anode (G2 in some nomenclature).
jr
Eric H
03-05-2011, 09:58 PM
It sure looks like it has some Xtra parts to the gun?
bandersen
03-05-2011, 10:22 PM
It sure looks like it has some Xtra parts to the gun?
It sure does. Here's a closeup of the gun.
http://farm6.static.flickr.com/5054/5501537492_b802b22909_b.jpg
Here's a 10BP4 for comparison.
http://farm6.static.flickr.com/5020/5500955413_99c48b2124_b.jpg
jr_tech
03-05-2011, 10:36 PM
It sure appears to have a split second anode with a short focus element between the two sections, similar to the DuMont gun that I posted on another thread:
http://www.videokarma.org/attachment.php?attachmentid=169495&d=1298095247
I can't see if the focus is tied to the first anode, however. :scratch2:
jr
Q: How does the overall length compare two a 10BP4? It looks like the gun is pretty long.
Eric H
03-05-2011, 10:53 PM
I guess the next step would be to put it in a working set and see what happens?
bandersen
03-06-2011, 12:19 AM
It sure appears to have a split second anode with a short focus element between the two sections, similar to the DuMont gun that I posted on another thread:
I can't see if the focus is tied to the first anode, however. :scratch2:
jr
Q: How does the overall length compare two a 10BP4? It looks like the gun is pretty long.
It's actually about 1/2 " shorter than a 10BP4.
I guess the next step would be to put it in a working set and see what happens?
Sure thing. I suppose I'll have to put the focus coil off to the side if this CRT really does have electrostatic focus.
cbenham
03-06-2011, 01:07 AM
It's actually about 1/2 " shorter than a 10BP4.
Sure thing. I suppose I'll have to put the focus coil off to the side if this CRT really does have electrostatic focus.
Is it aluminized?
Cliff
bandersen
03-06-2011, 01:58 AM
Is it aluminized?
Cliff
Nope, but I wish it was.
John Marinello
03-06-2011, 09:10 AM
I'd try it with the focus coil in place. I didn't have to remove the focus coil
when I used the 5AXP4 in my 16GP4 Zenith.
bandersen
03-11-2011, 11:52 PM
I pulled out one of my trusty Admiral chassis tonight and gave this CRT a try.
Here it is with a 10BP4 receiving a local LP VHF broadcast.
http://farm6.static.flickr.com/5177/5518634185_9197dfa40d_z.jpg
Here it is with the 10XP4 installed along with the same focus coil and dual-section ion trap magnet as the 10BP4
http://farm6.static.flickr.com/5131/5518634303_30da4fdd4f_z.jpg
I think the focus coil has to go.
Luckily, I had enough slack to slide it of the CRT and put it to the side.
http://farm6.static.flickr.com/5134/5519225360_5ae2a0e6d8_z.jpg
http://farm6.static.flickr.com/5178/5518634611_724c6fce5c_z.jpg
That definitely helped, but it was still a little fuzzy. Maybe a single section magnet would work better :scratch2:
http://farm6.static.flickr.com/5096/5518634821_49b16b7d90_z.jpg
http://farm6.static.flickr.com/5213/5518635037_93ff0d38bf_z.jpg
Yes, definitely. Not perfect, but I have a few magnets more I can try.
Just as soon as I can remember where I put them that is :o
I still have no idea what this CRT is all about, but it's bright and seems to be usable :)
http://farm6.static.flickr.com/5138/5518635253_6c00f6f814_z.jpg
http://farm6.static.flickr.com/5255/5518635479_47a93a8b77_z.jpg