HP9836C colour alignment (grey scale tracking)

[Tony Duell]

> > But for a CRT they're cathode, (control) grid, first anod, second (or
> > focus) anode, somethimes third anode and final anode.
> 
> Or, as we say, cathode, grid 1 (or Wehnelt), grid 2 (or screen grid), grid 
> 3, grid 4 and anode.

Ah, so you use the American names, essentially. 

The term 'Wehnelt cylinder' for the control grid of a CRT is used in a 
few books in the UK, mostly physics (as opposed to 
electrical/electronics) books. It's not common, but most good electroic 
engineers/hackers would recognise it.


> 
> >> All other electrodes in a normal tube besides the cathode are called
> >> 'control grid' (or just grid), 'screen grid', 'supressor grid' and so on.
> >
> > Are you seriously saying that in Germany, the focus electrode in a CRT is
> > called a 'supressor grid'?
> 
> Eh, no ;-) But it's called grid 4. Grid 3 however has the same potential 
> as the anode.

The depends on the electron gun design :-) It's very common in the UK to 
call the focus electrode 'A2' (or 'second anode'). Maybe there is an 
extra anode between the first anode and the focus anode, but it's not 
brought out to a separate connection, so to the desigenr of the monitor 
or whatever it doesn't really make any difference :-)

Interesitngly the BArco monitor manual I've just picked up (it's a colour 
monitor using a delta-gun CRT), calls the electrodes  :

KR, KG, KB (the 3 cathodes)
G1 (the control grid)
G2R, G2G, G2B (the 'grids' or 'anodes' connected to the cut-off controls)
G3 (the focus electrode)
G4 (the final anode, connected to the 25kV supply via the connector on 
the side of the CRT flare)

And nothing called an anode at all.

So it appears there's no real convnetion....

-tony