CTC 10 HV affected by brightness
Been stuck on this for weeks. Initially I thought it was a focus problem, but The HV on my 10 drops to around 14kv whenever the brightness is up, and it jumps around depending on what’s on screen, I have no idea what could be causing this. I’ve pulled the cap off the regulator tube and it made no difference, the rest of the hv tubes are fine. the power supply seems to be working fine. I even tried a different CRT but it made no difference, does anyone know how I could fix this??
All help is appreciated. Thanks again |
I presume the high voltage is normal when the screen is dark?
Have you replaced the tubes or only tested them? Tubes in the horizontal section can test good but be weak in actual use. |
Another thought: with a black screen, check the 640V boost voltage to see if something is pulling it down.
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Does the picture 'bloom' (expand), go dim and out of focus with brightness turned up?
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:oOOPs double post
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I’m so lost I tried a few more things. None of the voltages or resistances look concerning. I checked the flyback it seems fine. Still no change
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To repeat, is the boost voltage normal with a black screen? Does it go up and down with the high voltage as brightness changes?
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Seems like the hv is not regulating or responding to the load.
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I had a silvertone ctc12 clone with the same problem hv would not go over 19 kv higher the brightness the lower the hv I checked and changed literally everything and was never able to figure it out. I basically gave up on it but it did work nice but was not right.
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As old_tv_nut mentioned, more info would be helpful.
For example. HV reading at anode with brightness at low/mid/high 640v BOOST source with brightness at low/mid/high Damper plate (junt of L30 / C90) with brightness at low/mid/high This might give some clue as into what the problem is. |
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