Re: Significantly drop G2/brightness (4600 raster hack)?

----- Original Message -----
From: "Rodger Boots" <rlboots@cedar-rapids.net>
To: <vectorlist@synthcom.com>
Sent: Monday, December 23, 2002 12:29 PM
Subject: Re: VECTOR: Significantly drop G2/brightness (4600 raster hack)?

> Basically cathode current = brightness, so less bright is less current.
> As for current in the grid itself, it's not significant.

So where do I go from here? What should G1 bias be (volts)?

> > At 12:38 AM 23/12/2002 -0600, Rodger Boots wrote:
> >
> >> Gregg Woodcock wrote:
> >>
> >>> OK, here is a very interesting udpate.
> >>> By putting increased resistance, I was able to drop the previously
> >>> lowest
> >>> (stock/non-modified) G2 of 375V to about 200V with not a bit of
> >>> difference
> >>> in brightness. Well I figured I'd show the macine who was boss so I
> >>> shorted
> >>> the G2 pin to ground (0V). I got a picture that was about half as
> >>> bright as
> >>> it should have been to be perfect. What is up with THAT? I got
> >>> roughly the
> >>> same brightness with it ungrounded. I am going to use the
> >>> rejuvenator to
> >>> check for G2 short in the tube but as I recall, I backed this one up
to
> >>> another machine that was working fine and it proved without a doubt
> >>> that the
> >>> tube was fine (95% sure about that). I must have some kind of a
ground
> >>> problem but I just don't see how/where...
> >>>
> >>
> >>
> >> If running G2 grounded still gives a fairly bright picture you have
> >> either too high high voltage or not enough cathode to grid 1 bias.
> >>
> >> Since dropping G2 to ground DOES get the brightness low enough you
> >> might just add a second resistor from G2 to ground to whatever
> >> resistance you already have from G2 to the screen pot so the
> >> effective voltage range of the pot is where the CRT needs it. It's
> >> not going to hurt anything to run G2 near ground, but make sure the
> >> high voltage isn't excessive.
> >>
> >>
> >>
>
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