I’m getting back into the apple II game after 30 years away from it. I purchased a clone and a real apple about a year ago. The clone works fine. The real apple has an issue in text mode on a colour monitor (Commodore). In HGR mode, the text is crisp with the normal colour fringing, but in text mode, the colour is so overdriven that you can’t read the text. I disconnected the 4.7K resistor to Q6 (colour killer transistor) and the text is the same in text mode or HGR (which it should be). I jumped the hue adjust control (which should ground the colour burst signal) and the colour is overdriven the same as in text mode which makes me think that the colour killer circuit is fine. Any ideas why grounding the colour burst would overdrive the colour on the screen?
Edit, I disconnected the 2.7K resistor that feeds the colour burst to the video out transistor and still the colours are completely overdriven.
I've attached 3 scope pictures. The 2 with the shorter fatter pulse are from the clone (one in text and one in hgr mode where you can see the colourburst). The one with the skinnier taller pulse is from the real apple with the resistor removed that feeds the colourburst to the video transistor.