Quote:
Originally Posted by Kevin Kuehn
That's because it's intended to use an electrostatic focused CRT. Which is nothing more than a DC voltage that connects to the CRT's focus pin. I think on a 17HP4 it's G4, but I can't make it out on your schematic.
https://frank.pocnet.net/sheets/127/1/17HP4.pdf |
On the schematic, pin 6 is grounded.