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Anyone familiar with a SEncore cr70 tester?
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
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Vacuum tubes are used in Wisconsin to help heat your house. New Web Site under developement ME http://AntiqueTvGuy.com |
#2
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i have had one of those for years . send me the results and i will see what i can do for you.
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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
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Vacuum tubes are used in Wisconsin to help heat your house. New Web Site under developement ME http://AntiqueTvGuy.com |
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Still need help here. Anyone...PLEASE jump in if you know how to interpret these readings.
Thanks, Bob
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Vacuum tubes are used in Wisconsin to help heat your house. New Web Site under developement ME http://AntiqueTvGuy.com |
#5
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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.
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