An Emerson with a 19AP4??

[bandersen]

Originally Posted by dieseljeep

I have never seen a metal cone crt, that was aluminized.
The "C" probably only designates an improved or latest version.

I've never seen an aluminzed one either, but the Tung Sol data sheet does say
19AP4C - Grey Filter Faceplate Aluminized Screen

http://frank.pocnet.net/sheets/127/1/19AP4.pdf

[benman94]

For what it's worth, I had a necked 24AP4A that had an aluminized screen, so at least some metal cone tubes were being aluminized either by the manufacturers or the rebuilders.

[jr_tech]

Originally Posted by benman94

For what it's worth, I had a necked 24AP4A that had an aluminized screen, so at least some metal cone tubes were being aluminized either by the manufacturers or the rebuilders.

Aluminized 24AP4?
For what it is worth, my old GE tube manual shows the following for the 24AP4:
24AP4; gray glass, single magnet ion trap.
24AP4A; gray glass, aluminized, single magnet ion trap.

I doubt that rebuilders normally aluminized or even redeposited screens, anybody know of one that did?

jr

[ohohyodafarted]

Originally Posted by jr_tech

Aluminized 24AP4?
For what it is worth, my old GE tube manual shows the following for the 24AP4:
24AP4; gray glass, single magnet ion trap.
24AP4A; gray glass, aluminized, single magnet ion trap.

I doubt that rebuilders normally aluminized or even redeposited screens, anybody know of one that did?

jr

RACS in France was still aluminumizing and phosphoring until they closed. Hawkeye was doing it in the early days when Scotty's father was still running the company. After the move to the final location that Scotty ran, they no longer did either process. At the new location all they did was re-gun the tube.

[John Marinello]

Originally Posted by jr_tech

Aluminized 24AP4?
For what it is worth, my old GE tube manual shows the following for the 24AP4:
24AP4; gray glass, single magnet ion trap.
24AP4A; gray glass, aluminized, single magnet ion trap.

I doubt that rebuilders normally aluminized or even redeposited screens, anybody know of one that did?

jr

Clinton electronics did. Each of their rebuilds went through the oven 3 times.
They were North of Rockford, IL.

[Electronic M]

Originally Posted by jr_tech

Aluminized 24AP4?
For what it is worth, my old GE tube manual shows the following for the 24AP4:
24AP4; gray glass, single magnet ion trap.
24AP4A; gray glass, aluminized, single magnet ion trap.

I doubt that rebuilders normally aluminized or even redeposited screens, anybody know of one that did?

jr

Think about it logically...Back in the days of monochrome sets being more common than color 'bright spot' suppression on power off was often lacking, and customers often listened to their sets after deflection failure resulting in horizontal line burns (not to mention possible ion burns). All of that was common back then, and not all of that is easy to check for when accepting rebuilds, but it will make the finished product unsellable (especially if they handle enough of the CRT type that clients are not necessarily getting 'their' CRT back). It is relatively cheap to rephosphor monochrome CRTs (compared to color CRTs). So something that would fix those issues would be a money maker. Once color CRTs that are mostly not able to be economically rephosphored became the most common rebuild jobs the monochrome rephosphoring stations likely became a waste of space.

[jr_tech]

Originally Posted by Electronic M

Think about it logically...Back in the days of monochrome sets being more common than color 'bright spot' suppression on power off was often lacking, and customers often listened to their sets after deflection failure resulting in horizontal line burns (not to mention possible ion burns). All of that was common back then, and not all of that is easy to check for when accepting rebuilds, but it will make the finished product unsellable (especially if they handle enough of the CRT type that clients are not necessarily getting 'their' CRT back). It is relatively cheap to rephosphor monochrome CRTs (compared to color CRTs). So something that would fix those issues would be a money maker. Once color CRTs that are mostly not able to be economically rephosphored became the most common rebuild jobs the monochrome rephosphoring stations likely became a waste of space.

Makes sense! The only rebuilder operations that I remember seeing were doing mostly color CRTs at the time and had no phosphor deposition facilities. They could however, re-bond the safety shield on color CRTs, (another time consuming, tricky process).

jr