Thank you John, this is immensely helpful On Sun, Jul 7, 2019 at 11:30 AM 'John Rehwinkel' via neonixie-l < [email protected]> wrote:
> > I've recently gained an HM85 tube that I would like to power up in a > project, at this point time, purely for aesthetic purposes. I am having a > difficult time deciphering the corresponding schematics, pulled from > radiomuseum.org. If someone could assist, it would be appreciated. > > Pins 4 and 5 are the heater, and pin 3 is the common cathode. There's a > built-in amplifier triode you can ignore (grid is pin 1, plate is pin 9). > The display section has a deflection electrode on pin 7 and the target on > pin 6. Hook the target to 160-250 volts or so and it should light up. > Varying the voltage on pin 7 will change the amount of the target is > illuminated. The diagram shows how to use a low level (0 to -13V) signal > to control the display by using the triode, just hook the triode plate to > the deflection electrode, and to your B+ supply via a high-value resistor > (470k is what the diagram shows), then the low voltage signal at the grid > will be amplified to control the deflection (this is how the tube is used > in a radio to show tuning: the input comes from the radio's AVC voltage). > > - John > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send an email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/D51F823B-D51E-4B57-B30C-39B6AADA13E0%40mac.com > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAO97pxWqYLQPhFvFxDY5biZmzCVQx%3D_cWSn5HVwjALWvwpmbAA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
