10BP4 and 16AP4 on eBay
 

This guy is selling two used CRTs, an Aluminized? 10BP4 and a 16AP4


Interesting about the 10BP4 is it has an Ion trap, actually it appears to have two of them! I know some rebuilders did weird things like put bent guns in tubes that don't need them but?

Although the photos are good, I would like to have seen a closeup of the base end. There's something odd.

Some aluminized CRTs required an ion trap because they only applied enough aluminum to act as a mirror and not enough to stop the ions. For example the 12LP4C. It was intended to make them brighter.

Two ion traps is weird, if that's what they are.

I haven't seen that type of socket on a 10BP4 before. But, there are a lot of sets I haven't seen. The wires are stretched tight and it looks like there is barely enough slack to remove the socket.

Since it was aluminized it probably wasn't done by a Mom and Pop operation and probably has been rephosphored as well.

I wonder if this was a VDC rebuild? I seem to remember on their old web site that they had a standard gun they used for B/W CRTs and it would require that you rewire or change sockets for some CRTs that they rebuilt.

I see that the seller answered that the ion trap magnets have no effect. That seems odd also. My experience with a 12LP4 that had a straight gun was that adding an ion trap magnet made it impossible to adjust properly. I guess that could be why there are two, one cancelling the other, but they would still have an effect.

It's tempting to bid on this just to find out what the heck it really is. I hope someone on VK gets it so we can get a report.

John

The 10" set is interesting-I wonder what chassis that came from? There is a bit of framework on the left side of the picture, which could be the remains of a sliderule tuner for a radio. The dual trap thing is weird-possibly it was a flaky rebuild, and the installer found that it worked best with two traps?

Kudos to the seller for showing that these tubes DO work, instead of just a neck with white getters peeking out of a crt packing crate.

Hi the set the 10bp4 is playing in is a Emerson with the radio on one side tv on the other. This crt is strange that it has these 2 magnets and a genric white base moveing or rotateing the magnets puts shadows in picture but does not effect briteness of the picture

I was surprised that there weren't more bids on the 10BP4. I hope that whoever won it will post anything additional that they learn about it.

It's a curous beast.

John

The same seller also has a 10FP4 listed.