I am looking at the test resutls from a Sencore cr70 for a crt that I might possibly buy.

I am not familiar with this tester, but it appears that the G1 and G2 voltages are set to obtain a set point on the meter, individually for each gun.

If the G1 and G2 settings vary greatly from gun to gun, does this indicate that there is a large difference in emmission from gun to gun?

I can send photos of the test results via PM if there is someone here who can interpret the results for me, that would be appreciated.

Thanks,
Bob

i have had one of those for years . send me the results and i will see what i can do for you.

Thanks RCAman here are the results... tube is a 21axp22

red gun k=4 g1=2 g2=3
green k=5.5 g1= 6.5 g2=7
Blue k=13 g1=12 g2=11

For each gun, the pointer on the meter is set at a red mark between 12 and 13 on the scale in the good area. So I am assuming that the positions of k, g1 and g2 are set to acheive a pointer reading on that mark and that interpreting the settings on the 3 knobs (k, g1,g2) determines the strength of the gun.

I have actual photos if you want to see them. But I would need to send them to your regular e-mail address as attachments. I could try to reduce the size of the jpegs but at present they are about 1.3mB each.

Thanks much,

Bob Galanter

Still need help here. Anyone...PLEASE jump in if you know how to interpret these readings.

Thanks,
Bob

I do not recognize the readings. The CR 70 has fixed g2. The cutoff is set with a variable control that I assume produces a specified cathode current. Under full emissions test g1 is raised and the tube is good if the cathode current tracks the increase in bias. The CR 70 is largely a go / nogo tester. It does have an aging test, which measures the drop in emissions with reduced heater voltage. A good tube will drop very little.
Relevant measurements would be the position for RGB of the g1 in the cutoff set mode, and the cathode current in emissions test.