Re: Anybody done John's Raster Hack for Ampliphone?

In thinking this over (and not having the schematics at home...) I DID use
the 4600 socket with the 4600 chassis and simply removed the output
transistors. This left the Screen Control (the 1Meg pot) on the neckboard
for your brightness. Note the addition of the 1 ohm resistor to reduce
inrush current to the tube, probably not required, but I didn't try it
without - however as the monitor is hooked to the original heater circuit I
can see where that resistor is redundant and can be not installed - thus
keeping the heater circuit as original on the 4600.

So, you are removing the Ampliphone HV board AND the Ampliphone tube socket.

Remember that you must have the 4600 YOKE hooked up and placed way off to
one side (so it won't interfere with the picture...)

When you get around to pictures take a couple of the modified neckboard and
I'll rewrite the docs to fit them in...I'm going to edit them right now to
reflect this conversation to date...

John :-#)#

At 12:13 PM 04/08/2002 -0500, Gregg Woodcock wrote:

>----- Original Message -----
>From: "John Robertson" <pinball@telus.net>
>To: <vectorlist@synthcom.com>; <vectorlist@synthcom.com>
>Sent: Sunday, August 04, 2002 10:37 AM
>Subject: Re: VECTOR: Anybody done John's Raster Hack for Ampliphone?
>
>
> > hmmm, I really should re-read my old notes to check that. That is what I
> > meant about "novel concept", not you re-reading it. Sorry, it was late and
> > I was tired...
> >
> > That might explain your problem. I guess I thought it was covered...as I
> > say I'm not a trained technical writer...if you want to help clear the
> > notes up when you are finished that would be great, perhaps you can make
>it
> > clearer.
> >
> > Hope it is going.
>
>The only question left is whether to bypass the focus resistor in the tube
>socket. I can answer that one probably by experimentation if I can get the
>heater back. So you are saying that when I am done I can remove the 4600
>neck PCB and the Amplifone HV PCB completely. If that is true, how am I to
>adjust the brightness because that control is on the 4600 neck PCB?
>
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Received on Sun Aug 4 12:57:49 2002