Where to get picture tubes?

[Bobby Dip]

Originally Posted by earlyfilm

To test to see if an 8AP4 will fit mechanically, you don't need a dud. Simply make a paper template. To do this, go to:

http://frank.pocnet.net/sheets/127/8/8AP4.pdf

and save the PDF. Then print it, adjusting the scale until the inches on the drawing match your ruler. Cut same out and use that out for a trial fitting!

James

Great idea James, here is the result:





So it's definitely a 54 deg 8 inch tube, with a "clip" type anode connector. Also, it's Mag focus and Mag deflection. Does this narrow it down to an 8AP4?

Bob D.

[jr_tech]

Does the yoke slide forward? Otherwise it looks as if the tube might be about an inch too short...

jr

[Bobby Dip]

Originally Posted by jr_tech

Does the yoke slide forward? Otherwise it looks as if the tube might be about an inch too short...

jr

Hi Jr, no the yoke does not slide. Actually the rim of the tube falls right into a slot. It's just hard to see from the angle the picture was taken. The fit is perfect. I just hope I can find a tube.

Bob D.

[Kevin Kuehn]

I think normally the yoke would slide up tighter against the bell of the tube.

[jr_tech]

Originally Posted by Kevin Kuehn

I think normally the yoke would slide up tighter against the bell of the tube.

My thoughts exactly... I think that I am seeing about an inch of neck out in front of the yoke that should be well inside the yoke. The center of deflection should be close to the middle of the yoke, not at the front edge, as shown.

I am stumped, as far as I know, no 9 inch options exist.

jr

[WISCOJIM]

Originally Posted by Bobby Dip

Hi Jr, no the yoke does not slide.

Sure looks like it has an adjustment for it. (circled in red)

Edit: Guess not, I see in other pictures on the ETF site that the adjustment on top of the yoke would prevent this slotted adjustment from being used. Or is the metal plate under the wing nut also slotted? If so, then the yoke should be slide-able.

[Bobby Dip]

Originally Posted by WISCOJIM

Sure looks like it has an adjustment for it. (circled in red)

Edit: Guess not, I see in other pictures on the ETF site that the adjustment on top of the yoke would prevent this slotted adjustment from being used. Or is the metal plate under the wing nut also slotted? If so, then the yoke should be slide-able.

Hi WISCOJIM, I looked closely and found that the slotted adjustment only moves the magnet assembly, not the deflection coils. I assume moving the magnets focuses the picture, is that correct?

Bob D.