My HP scope has Z in but unfortunately requires it to be negative going video and not positive.
I have done a change to the diagram adding a few resistors and a diode to provide a DC clamp on the video amplifier input. The idea is to use the other half of the EB91, but it's physical location on my development makes that a bit difficult at the moment, the anode of the EF91 video amp sits at around 90 Volts with video in the positive direction and peak levels of up to 60 to 70 Volts available.
Time for a break from the soldering iron over the weekend, but thoughts still welcome.
Adrian
I have done a change to the diagram adding a few resistors and a diode to provide a DC clamp on the video amplifier input. The idea is to use the other half of the EB91, but it's physical location on my development makes that a bit difficult at the moment, the anode of the EF91 video amp sits at around 90 Volts with video in the positive direction and peak levels of up to 60 to 70 Volts available.
Time for a break from the soldering iron over the weekend, but thoughts still welcome.
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve
