Westinghouse H840CK15

[benman94]

Originally Posted by jr_tech

Impressive! that chassis is a beast! Is the circuitry much different from the CT100, or did Westinghouse not get innovative?

I assume the chassis is copper, like my h22t155, or is that rust?

I have seen drying patterns in some early kasil settled phosphor tubes, but not rings like that... could that be a moire pattern perhaps generated by poor contact of the silk screen during the screening of one of the phosphor colors? Seems likely that RCA would sell less than perfect tubes to competitors.

Perhaps the getter above the blue gun was the first one flashed after "pinch off", in a fairly poor vacuum.

Looks like a very fun project.

jr

The chassis is copper plated.

I couldn't resist the temptation to retest the tube today with the Beltron. Dave Pike will be coming over with his Sencore CR-70 to check for cutoff later this week.

Red:


Blue:


Green:


I've never seen a tube this closely matched on all three guns, so I'm inclined to think it's gassy, but I got no indication of gas while testing it (blue or purple glow between the cathode and first grid) or with the tesla coil...

I need to find someone in the area with a working 15 inch chassis.

[ohohyodafarted]

Very curious Ben.

Meter readings seem suspicious just like a gassy 15G I have. But the fact that you cant get any neck glow, even with your Tesla coil makes me believe the tube is NOT gassy. I have never seen a gassy tube that failed to give a purple glow with a Tesla coil.

Your getters look just like the ones in my aforementioned 15G (shiny and black) which is gassy, but my tube glows like a neon sign with my Tesla coil.

CR70 cutoff test should prove it one way or the other.

[benman94]

Originally Posted by ohohyodafarted

Very curious Ben.

Meter readings seem suspicious just like a gassy 15G I have. But the fact that you cant get any neck glow, even with your Tesla coil makes me believe the tube is NOT gassy. I have never seen a gassy tube that failed to give a purple glow with a Tesla coil.

Your getters look just like the ones in my aforementioned 15G (shiny and black) which is gassy, but my tube glows like a neon sign with my Tesla coil.

CR70 cutoff test should prove it one way or the other.

What tesla coil do you use? Any tesla coil of sufficient power should show gas... now I'm going to check and make sure it's working properly with an unused CFL...