#31
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A few things. First this set will never be bright ! Thats normal, most watched them with little or no room lighting. Trying to make it brite will cause trouble.
Ignore the color problem for now, turn it off & make it a good B&W for now. Do a set-up next by the book. G-2's, kine bias, HV, hoz efficiency etc. TUBES. Dont assume NOS are new & good. Many shops saved weak ones as test tubes. Find a dealer that looks at them first. Dont trust tube checkers ! They dont run the tubes under normal conditions. enuf fer now 73 Zeno LFOD ! |
#32
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So you said that when you turn up the brightness as the picture blooms it jumps around. Does it begin to loose horiz. hold? (this was a few pages back) Or does it seem to loose Vert. & Horiz. hold?? Anyway, This blooming is a symptom of a bad HV Rectifier tube, So I hope you have more than one 3A3, and you can try more than one...... Same for Horiz. Output tube..... I guess you have by now got a schematic from Early Television website.... Can you check the voltages at the power supply 360V Source, 250V Source, 270V Source both when brightness is up, and when the screen is dark, and report voltages under both conditions. Also, V12 6DQ5 Horiz output tube, Can you report voltage at pin 1-5 G1 should be -40V & Pins 4-8 Should be 130V, Also 6CG7 Horiz Osc. Can you report voltage at pin 6, Should be 140V. Report these voltages at both High Brightness, & Blanked or Dark Screen.... Also, the color killer should not have any effect on weak color...... Did you replace all the capacitors in this tv? This morning, I'm thinking your statement "it jumps around" did not mean the picture jumps around, or the tv itself jumps around, but it means the HV jumps around as things change on the screen.. Yes, this sounds more like it..... But I'm still interested in the other points about voltage readings.... Thanks, & Good Morning! .
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Yes you can call me "Squirrel boy" Last edited by Username1; 03-07-2024 at 07:53 AM. |
#33
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If it's a sync jump it could be that AGC is set incorrectly and the change in brightness/contrast may be overloading the sync separator.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
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